fuel gauge issues

[mccrash]

i have a 94 mtx.when i turn the key on or crank it the gauge goes as far as it can past fuel and stays.i checked the forums to start off.i checked the 18# fuse and replaced it just to b sure.i checked the ground and ran one my self to the - little wire that runs off the ground to the battery.still did the same thing went past full.i had to replace the wire connector that went to the fuel pump sending unit a bit ago cause it just went bad.i know its all good i check the connectors all good.i un hooked the ground from the sending unit turn the key on same thing.ok get this i unhooked the wire to the ground and sending unit wire altogather and still went pass full with nothing connected but the fuel pump.i replaced the pcm to not long ago so thats not it.the only thing i can think of is the cluster gauge is bad.my temp gauge works btw.

 

[B.Benard02]

I hope someone chimes in soon because I'm having the same exact problem. The gauge always goes above full. I have to estimate how much fuel I have. To fix this do we have to remove the cluster and such?

 

[nothingtoseehere]

I would suspect the float before the cluster personally.

 

[mccrash]

i got a new cluster the other day cause the rpm gauge was not working and still the gauge goes passed full.i ground the sending unit to the lil ground that goes to the - battery post with all connected and still it does the same thing.the only thing left now is the sending unit is gone bad.its old and it was out of the tank for some time to rust so i beleave i ll change that and it will fix it.advace u can get the pump and all for 129

 

[SHOtime2511]

check the float.

 

[mccrash]

i tuck the sending unit out and turn the key on and moved the float up and down and still stayed at past full no change at all.its got to b the sending unit i think at this point.

 

[shoon]

There is an anti-slosh module built into the cluster. It prevents the guage from bouncing around while the car is in motion, try holding the float on the sending unit in one position for a while, maybe even try unplugging it.

If you unplug it, it should read empty. However if you unplug it, and it remains on full, you have a short somewhere.

 

[mccrash]

o well thats not good cause i replaced the connector a while ago with 3 feet of wire and i can unhook the sending unit ground and and + and it still goes past full so a short it seems it might b.my car door leaks right there where the wires r going on the floor panel so that might b where it shorted.i ll look in to that.thanks

 

[B.Benard02]

ok how do i check the float?

 

[mccrash]

best way i know is take the sending unit out of the tank hook it back up and turn on the key.play with the float lever if its bad the gauge does nothing likely