3/8 is the supply line. Usually on a hot day, I've heard that noise for just a few seconds, that's normal.

My propane tank and regulator ice up and the propane output is dropping. Actions to Take to Cure the Problem Until this vacuum is released, the car will not run. It does not leak after I run several gallons of gas out of the tank. Removing the cap enables the car to run, but this solution should not be a long-term fix.

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I believe the gas tank is actually not under pressure but under suction. I've been trying to find some car shows local, but the funny thing is - this is the first place where I can't find any car shows and cruises.

Could this much pressure be affecting performance?

It sounds like your system is not purging. This process is automatic.

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Fuel Cap and/or Vent on Tank is Bad: Yes there is a Small Vent Hole in the Cap to Replace the Air as the Fuel is drawn out of the Tank, Vent on the Tank does the same thing but both need to be working for the system to work properly.

Alternatively, some cars have a breather pipe fitted.

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 remove my cap there is sometimes the slightest hiss.

These articles cover a wide variety of topics organized into 8 categories to facilitate people who are searching for these kinds of information or people who want to know more about their vehicles. Conclusion Fuel is pumped through this line from the tank to the fuel metering body. Reason for Too Much Pressure in the Gas Tank Fuel pumps feed fuel to engine carburetors by pumping it from fuel tanks. Removing the cap enables the car to run, but this solution should not be a long-term fix. The newer fuels have oxigenates in them and stuff like ether, this makes for some nasty fumes coming out of the gas tank. I've got a 330hp/350 GM crate with a Holley 750 vac sec. Check my web page for First Gen Camaro suspension info: Thanks Dave. Normal pressure in a fuel tank is kept stable through the evaporative emission control system (EVAP) system. Reducing the temperature of the gasoline and car's gas tank has the opposite affect. JavaScript is disabled.

Do you apply your car code reader correctly?

He can only put in a small amount of gas, even though the tank is only 1/4 full.

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.

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If there is not proper venting of the fuel tank to allow this then I believe it will be under great suction and when you take the gas cap off you are actually hearing air going into the gas tank rather than leaving it..... just my thoughts...... corvette owner since 1959,retired race engine builder,former NASCAR tech inspector,new corvettes owned,59,62,63,64,65,66,97,99,02 and 05. The tank vent lets air IN to the tank to replace used fuel. Until this vacuum is released, the car will not run. 195 Posts .

Why does this happen. When you drive the car you get a slight smell of gas inside the car.

High pressure can occur if any part of the EVAP system fails, becomes clogged or is restricted.

Mine does it too, but not to the extent that you are describing.

I assume there are no codes {SES light} on. 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. Removing the cap prevents a tank vacuum, stops the car from stalling and stops pump malfunction. Do you think there would be a problem with drilling a small hole in the gas cap to relieve the pressure?

Static pressure in the tank would only help the pump feed the engine. Blog.autointhebox.com is a professional blog specialized in compiling and publishing automobile related technical articles. For a better experience, please enable JavaScript in your browser before proceeding. It has been mild today, but if you are using fresh fuel it will be winter grade and therefore vaporise much too readily.

It contains a mixture of over 500 hyrdocarbons. 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. When The Tank Warms Up And Gas Cap Is On Tight, Pressure Builds In Tank Causing Gas To Leak Out Around The Fuel Pump. 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. How much pressure is in my propane tank? Until this vacuum is released, the car will not run. Besides, it recommends a selection of high performance diagnostic tools that have been approved and commended by many car owners. 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. I don't know if your car is the same as my 1988. When you open the cap there is much more pressure than there has ever been before. Alternatively, some cars have a breather pipe fitted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iscussion Starter • #1 • Jun 15, 2001. The gas cap is desinged to vent at a given pressure. You relieved a vacuum, not pressure. 3/8, 5/16, and 1/4 inch. Please enable Cookies and reload the page. Evaporated gasoline is contained in the air above the stored fuel in the car gas tank. 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. Hey Bob!yeah..finally made it here to Fayetteville, NC. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. A forum community dedicated to Corvette C Series owners and enthusiasts. Normal pressure in a fuel tank is kept stable through the evaporative emission control system (EVAP) system. I'm thinking that it is the fuel pump's job to deliver all the required fuel under pressure, not the tank's! We are in NJ, so all fueling is done by gas station employees. If you really want to try something try a new fuel cap. What happens if my fuel pressure regulator fails to work correctly, Symptoms of a Bad Fuel Pressure Regulator. If the tank is almost empty it will have more volume to vent even if it has no more pressure, that is normal. These risks are increased greatly if the cap has no bodywork cover.

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You can buy venting gas caps from Rick's First Generation. Too much air pressure in gas tank,air releases when cap is removed, prevents rapid filling of tank, replaced cap, did.

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. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Got a decent place to stay in this not so decent town. Removing the cap prevents a tank vacuum, stops the car from stalling and stops pump malfunction.

It will say so on the cap. Do not insert a rag in the open fuel tank filler pipe to prevent spillage and evaporation.

Is this normal.I mean its under A LOT of pressure.

If the saw is working hard the fuel will heat up and, along with the vibrations it will vaporise, causing the pressure build up.

Any comments, advice would be greatly appreciated! 67-9 Camaro's use vented gas caps.

My wife took our 2005 Subaru Legacy to the gas station. That can't be normal.

Why would my 1985 C4 build up Way too much pressure in the tank?. 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. +((!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![]+[])+(+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![])+(!+[]-(!![]))+(!+[]+(!![])+!![]+!![])+(!+[]+(!![])-[])+(!+[]+(!![])+!![]+!![])+(!+[]+(!![])+!![]))/+((!+[]+(!![])-[]+[])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![]+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![])+(!+[]+(!![])+!![]+!![]+!![])+(!+[]+(!!

Still unclear as to why there seems to be more pressure with less gas in the tank than with the tank nearly full. the difference in performance was night and day.

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