When I remove the gas cap from my 1994 Toyota Corolla wagon, a lot of gas if released. It seems like the gas tank has a lot of pressure in it. Also, I just had a crack repaired in the gas tank. The crack was not caused from being damaged but I suspect from expansion and contraction. Are there valves that relieve pressure in the gas tank? Where do the gas fumes go if they are released? Do they go into the carbon canister? What controls the pressure and the release of pressure? Is this a dangerous problem? I am afraid my tank will crack again and leak gas onto the exhaust pipe causing a fire.
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How long has this been going on? Could be a bad tank of gas... do you fill up at good stations like Chevron or the cheap Mexican ones? Also if you filled up when the tanker truck was filling the station you may have ended up with a tank full of sediment; there's a lot of gunk in their underground tanks and when the tanker tops it off the filling action stirs up a lot of that ****. Try filling the tank with some high-quality 87 octane (91 will make it worse) after putting a bottle of fuel system cleaner in the tank. You should also try pulling the codes; some codes do not cause the check engine light to illuminate but are still stored by the PCM. If all else fails, go back to the basics... fuel, spark and pressure. If you can eliminate two you should be able to make your job easier.
When taking gas cap off give it a few seconds for the pressure to escape from the tank. Also you may not be putting the nozzle in far enough for the fume preventor(the rubber thing on the nozzle)to press down. That will make it stop pumping gas. Sometimes you have to press the rubber down when it is cold out.
bleed any pressure off at the engine. drain and lower the gas tank, remove the pump install new pump. replace all hoses with new while you are in there and might do the gas gauge sensor too and any external filter nearby. reinstall tank, put in gas, turn on ignition and bleed any air out. go.
You have to remove the gas tank .First lossen the gas cap to remove the pressure. the fuel pump is inside the tank. The tank has two bands that are bolted in place . Siphon out the gas from the tank. The tank will come down . remove the wiring plug from the tank. You can now remove the ring surrounding the fuel pump. Take off the old pump and replace it with the new one. be sure to notice how you took off the electronic plug. reinstall it. Replace the tank and refill it with gas. it should work . you may have to work the fuel pump around to install it.
you'r EVAP system is not purging the system . I suspect it is your charcoal canister located in the left side of the engine compartment located near the master cylinder its a piece of cake to change it just slides up after you diconect the lines .