Went to fill up tank when it was almost full gas was leaking from under car. Someone said it might be air in the line since I had replaced the gas cap with a generic cap. Have since replaced with genuine part, but gas is still leaking when ever I fill up the tank?
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Usually this P0456 code is caused by an incorrect or faulty gas cap. Filling
the fuel tank with the engine running could conceivable cause this code as well
or if the cap wasn't properly tightened. Any of the following could also be
A small leak in any of the EVAP hoses or fuel tank hoses
Sounds like your float or sender unit in the tank is not registering the fuel level properly. They do go bad but the problem is the unit(fuel pump and sender) is one piece and has to be replaced together, unless you find someone willing to remove, separate and repair it.
Obviously you have something above the tank that's leaking. That will result in a code the same as a bad or loose gas cap. At this point, the only way you can find the source is to take a good look at everything, even if it means dropping the tank to do that. (better than wasting fuel or having a fire start under there).
Disconnect the battery, Jack the rear up on stable jack stands. use a smaller jack with a piece of wood to stable the load under the tank. You will see 2 band straps under the tank, remove the bolts, only 1 side have bolts, the other side swings down. The hose from the gas cap will have to be disconnected, which can be !!!!! when in-stalling. you can then drop the gas tank down easily with the jack just a bit, enough to reach around to unplug the fuel pump plug, and the gas lines. Once it's removed, the pump has a big screw on ring, take it off and the fuel pump can be pulled out.
it could be that it has or is getting air in the tank in the form of vapors i know that it may seem unlikely but it does happen so next time that you go to fill up try opening up the tank cap while you go pay let ventilate and when you put the nozzle in do not shove it all the way in just enough for the vapor guard to cover the mouth and use the control of flow method.
The evap system ( fuel vapor recovery system ) , if there is a leaky hose, can let fumes out that can be detected in the cab. If you "top off" the fuel at the pump you can spill fuel into the charcoal canister meant for fuel vapors only. the vapor recovery system is behind the left rear tire.
Usually if there is a hose leak a check engine light will come on.
If you TOP OFF, don't. If you don't, good. Hope this helps.