too much pressure in gas tank

I don't know if your car is the same as my 1988. Any comments, advice would be greatly appreciated! It will not let pressure out. I'm wondering if the valve is stuck open, allowing the intake to constantly suck the fuel from the tank through the EVAP canister. While it is hard to say, I would not consider your expereience to be an indication of a problem. Until this vacuum is released, the car will not run. Fuel is pumped through this line from the tank to the fuel metering body. Warning He fixed it with an old guitar string. I was just now putting a 625 holley on and when I disconnected the fuel line....It sprayed like a garden hose all over the place. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. But it increases the risk of fuel vapor contamination, pump blockages, increased consumption, poorer performance and fire hazard. 3/8, 5/16, and 1/4 inch. I quickly put my thumb over the line and yelled for my wife to take off the gas cap...When she did, the sudden release of pressure blew the cap off so hard it hit her in the face! the first time it happened, as for the cure I'm sure someone with more experience with this problem will step in. Most gas caps have valves fitted that automatically release the vacuum at optimum pressure. When The Tank Warms Up And Gas Cap Is On Tight, Pressure Builds In Tank Causing Gas To Leak Out Around The Fuel Pump. Vehicle gasoline is not a singular substance. High pressure can occur if any part of the EVAP system fails, becomes clogged or is restricted. 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The ecm should tell the system to purge when certain conditions are met. And old cars are more rare than usual. A car's gas tank will build pressure under normal operating conditions. If the cap has a faulty valve, replace the cap. Static pressure in the tank would only help the pump feed the engine. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Peterson Engineering: Hydrocarbon Vapor Pressure, AA1 Car Auto Diagnosis & Repair Help: EVAP Evaporative Emission Control System. When I stop my car there are gas vapors coming out of the vent line located under the filler cap just behind the rear wheel. Why would my 1985 C4 build up Way too much pressure in the tank?. How to Equalize Pressure in a Vehicle's Fuel Tank - YouTube http://albums.photopoint.com/j/ViewPhoto?u=1331216&a=9901695&p=33013081, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. [])). I'm happy to hear you weren't smoking a cig. Alternatively, some cars have a breather pipe fitted. Until this vacuum is released, the car will not run. The most common points of failure are a kinked fuel vapor line, a clogged EVAP canister or a failure in the purge control or vent solenoid. When i loosen the gas cap it will take at least 40 seconds, sometimes more, for all the air pressure to vent from the tank. Got a decent place to stay in this not so decent town. It almost sunk too if it werent for the foam in the front. Do you think there would be a problem with drilling a small hole in the gas cap to relieve the pressure? If the cap has a faulty valve, replace the cap. It will say so on the cap. According to the national standards publication NFPA58, a propane tank with 20 pounds (5 Gal) of gas at 70°F would have a pressure of 145 psi; at 90°F, pressure would increase to 180 psi; at 105°F, pressure continues to rise to 235 psi, and at 130°F, pressures of 315 psi would be reached. The tank vent lets air IN to the tank to replace used fuel. The hose to the purge valve should be dry. This greatly increases fire danger. There are three lines to the tank. Have you ever take the challenge to diagnose A, Navigation system troubleshooting guidelines f. Why should I use winter tires instead of all-seasoned ones? Evaporated gasoline is contained in the air above the stored fuel in the car gas tank. If the saw is working hard the fuel will heat up and, along with the vibrations it will vaporise, causing the pressure build up. Still unclear as to why there seems to be more pressure with less gas in the tank than with the tank nearly full. Hey Bob!yeah..finally made it here to Fayetteville, NC. Fuel pumps feed fuel to engine carburetors by pumping it from fuel tanks. The overall ways to keep the cost of car ownership low, Original Autel MaxiSys Pro MS908P support 2 Year Free Update Online. For a better experience, please enable JavaScript in your browser before proceeding. What can cause excessive pressure to build in the gas tank. Is this normal.I mean its under A LOT of pressure. I assume there are no codes {SES light} on. That can't be normal. I have developed a fuel leak that seems to occur because of too much fuel tank pressure. If I fill my tank and pull into my driveway, gasoline will start escaping past the fuel cap about 1/2 hour after I park. Your car should have EVAP canister in front of the left front wheel it has lines and a electric actuator. Removing fuel causes a vacuum that, if not released or maintained at the correct pressure, becomes too great, causes pump failure and starves the carburetor of fuel. I saw a waverunner blow it's rider, both seats and front and rear compartments off Sunday the 29th cause his vent system wasn't venting outside of the hull. He tells my wife that the gas tank has too much pressure in it, and physically has to override the gas nozzle handle to force more gas into the tank. I actually went on a 1-2 hour drive the other day and when I opened the gas tank up there was pretty much no pressure released at all. I hope this helps. My buddy once bought a Corvette ZR-1, that was previously totaled and fixed (rollover) He was having performance related problems, it turned out that his gascap had paint dust blocking the vent hole. Is yours a vented cap ? Removing fuel causes a vacuum that, if not released or maintained at the correct pressure, becomes too great, causes pump failure and starves the carburetor of fuel. I'm thinking it may be too much for this motor as it still runs rich with mixture leaned back to nearly 1/2 turn out! Copyright 2020 Leaf Group Ltd. / Leaf Group Media. http://members.shaw.ca/corvette86/Evaporative Emission Control System.pdf, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The gas cap is sealed, the venting is done through the line Tim mentioned. When I remove my cap there is sometimes the slightest hiss. Some caps also maintain uniform fuel tank pressure. ONly about 1/8th of a tank of gas. I would suggest checking the lines and the canister and the switch that purges it. An older-type gas cap with no bodywork cover We are in NJ, so all fueling is done by gas station employees. Often the source of the problem is water within the small, portable propane tank. I'm assuming that this is because the gas is warming and expanding. The gas cap is desinged to vent at a given pressure. I would suspect heat causing the volume of air/fumes to expand.Please let us know how it resolves itself. © 2015 Autointhebox.com. These risks are increased greatly if the cap has no bodywork cover. Normal pressure in a fuel tank is kept stable through the evaporative emission control system (EVAP) system. 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A forum community dedicated to Corvette C Series owners and enthusiasts. Most gas caps have valves fitted that automatically release the … My wife took our 2005 Subaru Legacy to the gas station. You can buy venting gas caps from Rick's First Generation. What happens if my fuel pressure regulator fails to work correctly, Symptoms of a Bad Fuel Pressure Regulator. According to the publication NFPA58, a tank with 20 pounds of gas at 70°F has a pressure of 145 psi, at 90°F would have 180 psi, at 105°F would have 235 psi, and at 130°F would have 315 psi. I believe the gas tank is actually not under pressure but under suction. The tank was actually kinked in two places by too much vacuum generated by the defective canister. These risks are increased greatly if the cap has no bodywork cover. Why does this happen. 1969 Yellow/black Std Coupe Camaro. Vaporized fuel builds pressure in the tank. 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