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My 95 Pathfinder has a rather severe fuel smell in the right rear end right after the engine is shut off. After the engine has been off for about 5 minutes the smell is gone. I cannot find a fuel leak and suspect it is gas fumes leaking out of somewhere back there since the fuel tank/fuel cap has no pressure in it immediately after engine shutoff. I have check all the fuel lines, the canister, the check valve, the fuel pump access port and everything looks good and checks fine based on the shop manual. I have also replaced the fuel cap. The problem is worse in the summer. The fuel smell is not there when the engine is running and you cannot smell it inside the vehicle. It does not seem to matter how much fuel is in the tank.

I am fairly sure it is fuel vapor so what all should I be looking at back there and how do you tell where you have a vapor leak?

Could the fuel fill neck have a rust pinhole? Any other ideas? I have been chasing the problem for a year or so and am running out of ideas.

Jim
 

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Might be the o-ring that seals the sending/fuel pump unit (on top of the tank). Fill hose or vent hose have any cracks?? I dont know the correct name, but they use a "smoke machine" to find leaks in the fuel system. If it was coming from the exhaust I would say a injector stuck open and dumping fuel.
 

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I hate to pull the fuel pump cover to check the o-ring. Everthing looked tight there and I saw no signs of raw fuel getting out there. The fill hose and vent hose look good but the metal fill/vent section up top is rusted fairly badly. The smell is not on the exhaust pipe side and the engine is running normal and getting normal fuel mileage so I doubt an injector problem. Thanks for the input - I will look into the smoke idea.
 
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