Lawn mower vapor lock

One thing that may help for hard hot restarts is to prime the carburetor again, to account for any vapor lock. As I understand it, the primer bulb on these very small engines doesn't squirt fuel into the engine as it does on something like a lawn mower engine. It simply cycles the fuel through the carburetor.

new mower with vapor lock. Jump to Latest Follow 8K views 11 replies 6 participants last post by clydebusa Jun 25, 2013. W. williams lcm Discussion starter 1925 posts · Joined 2009 Add to quote; Only show this user #1 · Jun 6, 2013. I have a new ferris 3100z with the 37 HP dfi. The first 100 hrs it ran fine and now it stalls when it is being ...a vacuum form in the tank. Some of the tanks do indeed have vent tubes on them and they will do exactly that if they get pinched off. Some tanks are actually vented through the fuel cap and they can. cause the exact same thing if the cap vent gets plugged. Generally, the less fuel you have in the tank, the longer it will take.01 - Lawn Mower Carburetor. The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.Vapor lock in lawnmowers generally occurs during hot summer days and result in your mower stalling or simply not working at all. This issue occurs because the fuel in the fuel delivery system can overheat and vaporize, preventing fuel delivery to your mower. In this article, I’ll explain the causes of vapor lock in more detail.55. Messages. 14,765. Jun 18, 2012 / Engine 'locks up' and won't turn over (crank) #2. Check to make sure all connections are tight and clean. Particularly the grounds. If you have a three terminal solenoid the base is the ground and the starter is grounded through the bolts.If you’re in the market for a new lawn mower but don’t want to break the bank, finding discounted options can be a great way to save money. With so many retailers and online market...That's when the pump quits working because it cannot pump a vapor. Vapor in the pump reduces cooling, causing the pump to overheat, which closes up the clearances and makes the pump lock up. Enthusiasts universally blame the pump in these situations, when the reality is usually the fault of the fuel delivery system design.

03 - Husqvarna Lawn Mower Fuel Cap. As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur. This stops the flow of fuel to the ...As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won't be able to enter the tank and a vacuum or "vapor lock" will occur. This stops the flow of fuel to the carburetor causing the engine to stall.03 - Kawasaki Small Engine Fuel Cap. As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won't be able to enter the tank and a vacuum or "vapor lock" will occur. This stops the flow of fuel to the ...Nov 25, 2021 · Vapor lock is a problem caused by liquid fuel changing state to gas while still in the fuel delivery system of gasoline-fueled internal combustion engines. The fuel can vaporize due to being heated by the engine, by the local climate or due to a lower boiling point at high altitude. John Deere 4310 CUT, Ford New Holland 575E Industrial Backhoe, John Deere F725 Front Mount Mower. gary49 said: I have a 2003 Simplicity Conquest which has a K66 transaxle that has a locking differential. I live on the side of a mountain and it is really good on the steep parts.For faster delivery contact us Monday to Friday between 9AM And 5PM CST by calling 812.477.8273 to upgrade to shipping through UPS. If you are interested in reselling our products. CLICK HERE to go to our wholesale site.Vapor lock occurs when the liquefied fuel gets too hot and vaporizes. With vaporized fuel in the system, it starts to run lean, preventing the proper amount of gas from reaching the engine. Vapor lock most often happens with older models that contain a carburetor and mechanical fuel pump. The reason carbureted vehicles suffer the most is ...

john deere z trak 797. I have an '05 797 72"deck 29hp kawasaki engine I bought new. I keep it serviced and clean and it has performed flawlessly untill recently. I cut my place,just over 6 acres with it. It has around 250 hrs on it. I live in west central alabama where it is pretty hot and humid most of the summer.Keep your engine well-maintained: Regular maintenance, such as tuning up your engine and changing your fuel filter, can help prevent vapor lock from happening. 3. Park in the shade: When parking your car, look for spots in the shade or use a sunshade to help keep your engine cool. 4. Insulate your fuel lines: If your car is prone to vapor lock ...Vapor Lock. 477 likes. The official Vapor Lock Facebook. Official Twitter: https://twitter.com/VaporLock_BandVapor lock often causes a vehicle to fail to start after the driver shuts it off for a few minutes. It also causes cars to stall in slow traffic, when the engine tends to operate a...

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Vapor lock is when gasoline in the lawn mower’s fuel system turns to gas before reaching the carburetor, creating back pressure and blocking the engine. Learn how to tell if your lawn mower is vapor locked, what causes it, and how to fix it with simple steps.WELCOME TO ANOTHER EPISODE OF PATTAY'S PERFORMANCE! Today in the driveway is beloved Toro Time Master! I've had this Mower for 2 Years and this is the last...This one is a single barrel carb. It's a 2016 mower and there isn't an aftermarket carb for it yet. Briggs part number 595216 had to buy oem. darn ok ya the ones i get are 2 barrel, didnt realize the aftermarket single barrels arent available, thats no fun to drop that much coin but if you need it you need it.The temperature the fuel boils depends it formulation. Winter fuels are more volatile in nature. Plus depending on the formulation gasoline can boil as low as 140F. Also the Spring, Fall, and Winter month carb icing can be a problem too. I have had aircraft carburetors to ice over @ 70F...Vapor lock? Snapper mower 3.5 Briggs. ... I know this is a really old mower but it's very easy to use and more maneuverable than the other mowers she's had over the years, they don't turn as easily as this one does and they also don't push as easily when the self propel is disengaged. It has a very nice even level cut and barely uses any gas.ST1100A. 1575 posts · Joined 2019. #3 · Jul 25, 2022. Fuel line almost touching motor can cause a 'Vapor Lock'. When the fuel boils in the line it builds up gas pressure, not liquid, and will push the liquid away from it. It would be like pumping air into the fuel line and will push the liquid fuel away from it, back to its source, the fuel tank.

What is common is suspended debris in the fuel tank being sucked down into the outlet and forming a plug. When the engine stops, the debris floats off again. The other biggie that is use ( or time ) related is a vapour lock caused by a blocked tank breather. You check for the last by loosening the filler cap.Our Price: $44.95. (57) In Stock. Add to Cart. This easy-to-use tie-down kit keeps your ATV, mower, construction equipment, or other wheeled machine from rolling during transport. 1 Polyester strap and 2 steel wheel chocks secure 1 tire to your truck bed or trailer deck. 6 - 10 Feet Long. 501 - 850 lbs. PackEm.scrappy. 714 posts · Joined 2014. #3 · Sep 14, 2015. Vapor lock is when the fuel is hot enough to 'boil' and turn into a vapor, so doubt a snow blower is experiencing that. If the cap is not vented, it can and will cause the fuel to not flow out of the tank. More like a 'vacuum lock'.03 - Lawn Boy Lawn Mower Fuel Cap. As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won't be able to enter the tank and a vacuum or "vapor lock" will occur.When it comes to lawn care, there’s no better choice than Kubota mowers. Kubota is a leading manufacturer of outdoor power equipment, and their mowers are designed to provide super...What is common is suspended debris in the fuel tank being sucked down into the outlet and forming a plug. When the engine stops, the debris floats off again. The other biggie that is use ( or time ) related is a vapour lock caused by a blocked tank breather. You check for the last by loosening the filler cap.Riding Mowers; XT1-LT 42 (13WVA1CS009) - Cub Cadet 42" XT1 Enduro Lawn Tractor (2015) ... Flange Lock Nut, 3/8-16 $ 3.99 $ In Stock, Qty 20+ Add to Cart 0. 14. Cub Cadet 714-05005. Bow-Tie Cotter Pin $ 4.49 $ In Stock, Qty 20+ Add to Cart 0. 15. Cub Cadet 720-05075. Vinyl Cap, .29 x 1.00Yes, it is possible for a lawn mower to get too hot to start. If the machine is too hot due to a lack of ventilation or just from running for too long, it could potentially overheat. If this happens, the lawn mower may not be able to start or may cause damage to the engine if it does start. If your lawn mower is too hot to start, try turning it ...CCW's Vapor-Lock System utilizes the CCW-711W sheet membrane as a preformed first course on difficult-to-waterproof substrates such as lightweight structural concrete and wood. The CCW-711W sheet membrane is a 90-mil composite consisting of a self-adhering rubberized asphalt membrane laminated to high-strength, heat-resistant woven ...A common problem with Briggs or any other lawn mower is vapor lock or insufficient oxygen. When the engine begins to bog down or become unstable, try loosening the gas cap to see if it will stabilize.Sep 20, 2022 · The simplest method is to remove the spark plug. With the spark plug removed, either pull the recoil or activate the starter motor. Since there is no compression, the extra air/fuel mix can escape through the plug hole. This is the fastest way to fix a vapor locked lawn mower. The machine is "vapor locking" A "vapor lock" occurs when liquid fuel vaporizes, creating a lean condition (lack of sufficient liquid fuel). It often results from overheating. ... John Deere 725 Lawn mower Parts Diagram. The John Deere f725 has several dozen parts, as shown in the above diagram. So, sometimes finding the right ...

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This video shows how to repair a Husqvarna Riding Mower DIY Electrical Repair On A YTH 24K48 Kohler Courage Twin Cylinder PTO Wiring Terminal Connector. How...Its been a on going problem with this mower, thought at first it was the coil because it only did it when its hot, but turned out to be a fuel line that was ...If you’re in the market for a new push lawn mower, finding the best price is likely at the top of your priority list. With so many options available, it can be overwhelming to navi...5. When does a vapor lock happen? Vapor lock is a situation that happens in your pressure washer when the fluid fuel changes its state to gas in its gasoline-powered internal combustion engine. It can result in the loss of power or complete stalling of your pressure washer. It is very hard to start your engine from this condition again.4. Fuel system has become vapor locked. a) I have had to replace the fuel pumps on every Magnum that I have serviced in the last ten years. b) I have had to reroute the fuel supply line(s) to get them away from heat sources to reduce vapor lock problems. c) Vapor lock will not cause the flywheel to stick. 5.Remove tension on both belts as your first step. To remove the bottom belt, you must loosen, do not remove, the sheave pulley assembly. This will allow you to get the belt past the frame, which acts as a belt guide. tighten the sheave pulley assembly after installing the bottom belt, then install the top belt.Vapor lock refers to fuel in the carburetor getting so hot that it boils or vaporizes the fuel and cannot or will not start or run.....that cannot happen on a cold engine. Most small engine carburetors are notorious for gasket leaks. That allows air into the carburetor and breaks the siphoning of fuel. Most small mower engines do not have a ...Upvote. Outdoor Gasoline and Electric Powered Equipment and Small Engines - Lawn tractor vapor lock problem - My 16.5 hp weed eater tractor has taken to vapor locking (there is a clear fuel filter, tractor runs fine for about 20 minutes and then the filter is dry-will restart after a few minutes when gas can start refilling.Try taking the spark plug out, turn over the engine a few times, and reinstall. If no go, then a shot of starting fluid into the carb usually does the trick. The bowl on the carb might be bone dry, and the vacuum of combustion from the starting fluid will help. I tend to edit because I forgot to put something in my post.

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Aug 27, 2023 · Open the hood. Place a bag of ice on the fuel line between the fuel pump and carburetor and the one that connects to the fuel pump to bring down the fuel line's temperature and allow vapor fuel to condense. After a few minutes, try starting the engine. If the engine starts, there's a good chance vapor lock is blocking fuel flow. Sep 20, 2019 · Just a note on the “vapor lock” on ford flathead v-8’s…yes the Alluminum clothes pins worked well by providing a “heat sink” on the metal fuel lines, they dissapated the heat away and permitting the fuel to become cooler. Except that doesn't explain later uses of wooden clothespins, and as Allan Kittleson wrote: Honda Lawn Mower Handle Lock Knob (31) 31 product ratings - Honda Lawn Mower Handle Lock Knob. $15.72. Free shipping. Ariens 09287000 Zero-Turn Mower Key With Shield Gravely 991085 991086 991087. GENUINE OEM PART - FACTORY AUTHORIZED DEALERVapor lock on hot days seems to be a chronic problem on the 2000-series mowers with the Kohler engine. I rerouted the fuel line outside the engine shroud and run it without the side covers, but it still vapor locks on hot days. Has anyone solved the vapor lock problem by just installing a new OEM fuel pump? How long did that prevent vapor lock?older 10hp tecumseh engine hm100-159252L that's on a 5000 watt generator, horizontal shaft. the motor is typical 80's single cylinder and has breather tube sticking out side of block with 3" long black tube facing downward. the thing uses oil, and tends to make a mess on itself after running 5-8 hrs blowing oil vapor out the vent tube.How to un seize a riding lawnmower engine Step 1: Remove the spark plug. Step 2: Clean the combustion chamber with some cleaner. Step 3: Open the head and gently tap the piston cylinders. Step 4: Check the motor oil. Step 5: Test the blades and close all the components.• Problem 4: Vapor Lock. Vapor lock is a condition that can also cause the lawnmower to stop. This occurs when heated gases get trapped in the fuel tank, disrupting the fuel's flow to the engine. The trapped vapors create a lock, preventing the fuel from reaching the engine and resulting in engine shutdown. Vapor locks are more common in ...03 - Cub Cadet Lawn Mower Fuel Cap. As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won't be able to enter the tank and a vacuum or "vapor lock" will occur. This stops the flow of fuel to the ...Not sure if this is what your looking for but in the owners manual it says: Engine, Briggs & Stratton, Model Number. 122T05-0846-EA. Sears part number for the carburetor is 498170. The lawnmower model # is 917.376660. Upvote. # 4.May 16, 2018 · Try taking the spark plug out, turn over the engine a few times, and reinstall. If no go, then a shot of starting fluid into the carb usually does the trick. The bowl on the carb might be bone dry, and the vacuum of combustion from the starting fluid will help. I tend to edit because I forgot to put something in my post. 26. Messages. 5,447. Jun 29, 2011 / Fuel Filter not staying full while running lawn mower. #6. If you have a very restrictive filter, and that filter is located where it gets hot, (most anyplace near an air cooled engine)... you can have a vapor lock condition occur on the carb side of the filter... Ethanol fuels have a bit higher vapor ... ….

Vapor lock is caused by heat. Excessive heat from the engine, exhaust system, and/or outside temperature can cause the fuel to vaporize in the lines. Some winter fuel blends and high altitude can lower the boiling point of the fuel. This can also contribute to vapor lock. Is there a fuel additive to prevent vapor lock? The following are some ... A simple, often overlooked, trigger for an engine stall occurs when the heated gases inside the fuel tank can't vent properly. The pressure causes the gas flow to reverse and move out of the carburetor, effectively shutting the engine down. Often referred to as vapor lock, the engine can't operate with these heated gases trapped inside the tank. Here are the most common reasons your Toro lawn mower starts then stalls - and the parts & instructions to fix the problem yourself. We make fixing things easier! En español. 1-800-269-2609 ... air won't be able to enter the tank and a vacuum or "vapor lock" will occur. This stops the flow of fuel to the carburetor causing the engine to ...Unlock and Solve the Mystery of Vapor Lock on your Mower, Tractor, or Muscle CarLearn how to solve some of the most common problems faced by lawn tractor owners: Won't Start, Won't Accelerate, Won't Idle and Won't Move. Whatever your e...Aug 5, 2013 / Frustrating Intermittent Problem with Scag Turf Tiger Koehler Engine. #1. Hi! I'm new to this forum, so I apologize in advance if I do something wrong with this post. I have a frustrating problem with my Scag and am sure hoping you can help: It is an ~8-yr old Scag Turf Tiger with the 27hp Koehler engine, with ~300 hrs.A clogged carburetor is a common problem with Toro Timemaster mowers. When the carburetor gets clogged, it might cause the engine to lose power and stall. Usually, old or bad fuel will clog the carburetor. This problem occurs when you store your mower with gasoline for a long time, especially during winter.If it's full of oil, the piston cylinder may be full of oil, causing hydro-lock. This can happen when you tilt the mower forward and hold it that way for a few minutes. But when the cylinder is full of oil, the piston has to work against the oil and can lock. Lawn mower vapor lock, 64. Messages. 24,705. Jun 7, 2020 / Honda Lawn Mower HRR2169VYA Issue. #3. All that you need to do to have the drive working well is to lubricate the ratchets with some dry lithium chassis grease at the end of each season. While this is a PIA job because access is not easy, most of my customers have no problems doing it., HRN216VYA. 21" Walk Behind Mower, Variable Speed, Blade Stop System. 4.1. (144) Write a review. Roto-Stop ® blade stop system. Self-propelled, variable speed Smart Drive. 3 in 1 with Clip Director ® - mulch, bag, and discharge. Honda GCV170 engine with Auto Choke System., Just a note on the "vapor lock" on ford flathead v-8's…yes the Alluminum clothes pins worked well by providing a "heat sink" on the metal fuel lines, they dissapated the heat away and permitting the fuel to become cooler. Except that doesn't explain later uses of wooden clothespins, and as Allan Kittleson wrote:, Posted February 6, 2004. You should not have vaporlock issues with a fuel injected car. Chances are, you have a bad connection at one of the sensors, you have a leaking injector (s), or possibly the CAS in the dizz is going bad. I don't run the injector fan, never have. Run some STP fuel injector cleaner thru it, check, your timing to make sure ..., Lawn Mower Blade Tools:http://www.jackssmallengines.com/Products/Universal/Blade-Tools/sThis video shows you how to use a blade lock tool (#750058) when remo..., VEVOR Battery Powered 15 Gallon Garden Weed Sprayer with Wheeled Cart, 126FT Hose with Reel, 8 Nozzles, 2 Wands with Lock Trigger, 0-90PSI, 5-6h Spray Time, Wide Mouth Lid, Rotating Wheels with Brake . Visit the VEVOR Store. 4.0 4.0 out of 5 stars 476 ratings. 100+ bought in past month., May 9, 2019 · Briggs Vapor Lock? I have a MZT52 Husqvarna with a Briggs 26hp Endurance. Its 3 years old w about 180 hrs. Last summer after running for a while, I couldn't get it started unless it cooled down for a couple hours. I took it in and the dealer said I had a bad solenoid, which was replaced. , Cause 1 Carburetor. The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall., 03 - Lawn Boy Lawn Mower Fuel Cap. As fuel is consumed by the engine, the level in the fuel tank lowers. To make up for this, the fuel cap uses a small vent to allow air to enter the tank. If the fuel cap vent is clogged, air won’t be able to enter the tank and a vacuum or “vapor lock” will occur., Common Engine Problems for John Deere S240 Mower. Poor Engine Performance. Engine Will Not Start. Engine Is Hard To Start. Engine Runs Unevenly. Engine Misses Under Load. Engine Vapor Locks. Engine Overheats. Engine Will Not Idle., I had a motrcycle that would get vapor lock when I was beating the balls off it. It only used to happen at about 120 mph. While riding I used to take the key out, open the gas tank and restart the bike. So if it is vapor lock, just unscrewing the fuel cap should be an instant fix/diagnosis., Tripped circuit breaker. c. Motor winding damage. a. Ensure the connection isn’t loose and the socket works. b. Reset the circuit breaker or replace the blown switches. c. Contact customer support to seek a replacement in case of motor damage. 3. Cordless Battery Powered Lawnmower Starting Problems., Its been a on going problem with this mower, thought at first it was the coil because it only did it when its hot, but turned out to be a fuel line that was ..., How to un seize a riding lawnmower engine Step 1: Remove the spark plug. Step 2: Clean the combustion chamber with some cleaner. Step 3: Open the head and gently tap the piston cylinders. Step 4: Check the motor oil. Step 5: Test the blades and close all the components., Just a note on the “vapor lock” on ford flathead v-8’s…yes the Alluminum clothes pins worked well by providing a “heat sink” on the metal fuel lines, they dissapated the heat away and permitting the fuel to become cooler. Except that doesn't explain later uses of wooden clothespins, and as Allan Kittleson wrote:, How do I keep my lawn mower wheel from falling off? Depending on the model, this is how to fix this problem: Lever off the wheel trim/hub cap. Locate the flat washer & circlip, which are most likely loose inside the wheel. Make sure the metal bearings are in place inside the wheel. Fit the wheel back onto the axle., john deere z trak 797. I have an '05 797 72"deck 29hp kawasaki engine I bought new. I keep it serviced and clean and it has performed flawlessly untill recently. I cut my place,just over 6 acres with it. It has around 250 hrs on it. I live in west central alabama where it is pretty hot and humid most of the summer., General Lawn Mower Discussion. Lawn Mower Main Forum Husqvarna yth22v46 carb riding mower. Jump to ... Shut the PTO off! Been there, done that too many times:tango_face_grin epending on where you are, it could be a bit of vapor lock too. Try loosening the gas cap. It's been in 90's and humid here for a few days with not a breath …, Not vapor lock but is hydro locking. First you must resolve the carburetor problem of leaking fuel. With these engines using wasted spark it might have ignited …, JDM 1990 Honda Prelude SiStates - B21A - 5 Speed!! main relay FO SHO! Fuel injection cars with a return type regulator can't vapor lock, it's physicly impossible for a bubble to sit in the fuel rail with 180 liters per hour of fuel flowing through it. What your describing is the main relay., A common problem with Briggs or any other lawn mower is vapor lock or insufficient oxygen. When the engine begins to bog down or become unstable, try loosening the gas cap to see if it will stabilize., Having a perfectly manicured lawn is the dream of many homeowners. But achieving that perfect look requires an investment in the right tools and equipment. One of the most importan..., Location: Marion,Al. You didn't say but I gona assume that your Craftsman mower is a rear wheel drive,since those are the wheels that are giving you troube.It's a pretty common problem among Self-Propelled Mowers,of any kind.The dust covers behind the wheels can't keep all the dust & crud out.And from time to time they get so filthy that they ..., May 31, 2013 / Stihl BR 600 and Kombi 90 both vapor locked today! #1. Hi Troops, Was doing a nasty lawn today when my Kombi 90 string trimmer quit and wouldn't restart. I put it in the shade and got my BR 600 back pack blower going to cleanup some and it did the same thing!!! Of course the temp outside was over 90!!, How do you fix vapor locking on a 1989 ford E350? Bad gasoline will cause the 460 motor in my 1982 E350 to vapor lock on a hot day. I don't buy gas at super cheap off-brand stations to avoid this ..., Vapor lock is a common cause of engine stall on lawn mowers when the fuel tank can't vent the heated gases properly. Learn how to prevent and fix vapor lock with tips on fuel cap, fuel supply, carburetor and cooling system., Vapor lock on hot days seems to be a chronic problem on the 2000-series mowers with the Kohler engine. I rerouted the fuel line outside the engine shroud and run it without the side covers, but it still vapor locks on hot days. Has anyone solved the vapor lock problem by just installing a new OEM fuel pump? How long did that prevent vapor lock?, Not vapor lock but is hydro locking. First you must resolve the carburetor problem of leaking fuel. With these engines using wasted spark it might have ignited …, 2) Keep your engine cool - If your engine is running hot, it can increase the chances of vapour lock occurring. Try to keep your engine temperature as low as possible, especially in warm weather. 3) Use a fuel line insulation - This will help keep the fuel cooler and reduce the risk of vapour lock. 4) Raise the fuel pressure - This will ..., Kubota riding lawn mowers are top of the line, with plenty of models to choose from. If you’re looking to buy one, basic research for prices of new Kubotas can help you make sure y..., Remove the fuel pressure regulator's cover spring and diaphragm using a Torx screwdriver. Inspect the diaphragm for cuts, nicks or abrasions and replace if necessary. Vapor lock is the bane of summer for boaters. Parts of an outboard motor's fuel system are cooled or vented to prevent or break up the bubbles in fuel lines that cause vapor lock., Vapor Lock? Jump to Latest Follow 1K views 8 replies 8 participants last post by Robinls5 Jul 6, 2011. M. mikus517 Discussion starter 41 posts · Joined 2005 Add to quote; Only show this user #1 · Jul 5, 2011. 66 elky, 427, high rise victor, double pump holley, electric fuel pump, msd ignition. ..., We had a bad vapor lock problem on our old RV, the Ark, with a 413 engine. Turned out that the previous owner installed NON vented gas caps! These things need vented gas caps so you don't get a vacuum in the gas tank. The way I realized what the problem really was when I removed the caps and there was a whooshing sound as air surged into the ...