I read somewhere that only when the fuel tank is filled above, say, three quarters, that a bad sensor can cause an issue with idle and the feel of missing while driving at low rpm. I'm thinking FPR, but can't remember for sure. This is currently my issue. It seems the lower the tank is the better she runs. Any insight on this will be appreciated greatly.
Full fuel tank, missing and stalling
- Thread starter Yukon96
- Start date
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I read somewhere that only when the fuel tank is filled above, say, three quarters, that a bad sensor can cause an issue with idle and the feel of missing while driving at low rpm. I'm thinking FPR, but can't remember for sure. This is currently my issue. It seems the lower the tank is the better she runs. Any insight on this will be appreciated greatly.
SunlitComet
OBS Jedi-Do Good
no such sensor does that. But you can have issues with your evap system. Have you had that tested
SunlitComet
OBS Jedi-Do Good
What year are we talking first? There is actually a fuel tank pressure switch for the evap system in the later years but regardless you will not have the proper equipment to test it. I would check your fuel pressure and make sure your charcoal canister is not full of fuel.
SunlitComet
OBS Jedi-Do Good
the 96 does not have a tank pressure sensor so ignore that idea. I can only think that the canister is full of fuel or something in the evap system from the engine intake to the tank is a goof.
Sorry for the delay. I pulled the canister, no fuel in it, that I can tell. Put a tire pump on it and air flows through it. Do ya suppose it could be the canister purge valve on the intake. Again, It only does this when the fuel tank is about full. Less that half a tank right now, and running great.
SunlitComet
OBS Jedi-Do Good
Well the purge valve is higher then the canister so if no fuel in the canister I doubt it is making it way up the line and perhaps vapor locking. If you can get access to a fuel pressure gauge it would help rule out tank problems if you could measure the running pressure at various tank levels. My thinking with this is that the pump or it power flow might be getting choked with a large amount of gas in the tank. I know it sounds weird but damaged wiring on the pump module can cause that. Looking back at TSB's I see nothing related to your problem so it is likely not a widespread issue. You can borrow with a deposit a gauge from autozone. The tap is located on the fuel lines on top top of the engine to the left and rear of the throttle body. It will have a black cap on it as show on this picture borrow from the net shown below.
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