I have a 2002 Grand Prix and the fuel guage doesn't work. It shows full after filling up then goes up and down in the mean time. Do I have to change the fuel tank or can I access the sending unit elsewhere and what does it look like?
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Re: 2002 Grand Prix Sending Unit
The fuel sending unit is located on the top of the fuel tank, On the grand prix you will have to drop the tank down (remove the tank straps) and the remove the ring that holds the unit in and then you can just pull the unit right out of the tank. You then place the new unit in and the installation is the reverse of removal
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The problem you explain usually has something to do with the sending unit float. Floats can absorb gas to the point where they just sink to the bottom of the tank. This can happen with both brass and plastic floats. The second thing is the sending unit you installed in your tank. Check to see if when you placed the unit in the tank , the float arm may have hung up on a baffle or some other obstruction in the tank. This would keep the sending unit from showing correctly. Good Luck Friend.
Could be a problem with the gauge in the instrument cluster, or the wiring that goes back to the tank, or the sending unit in the tank. The sending unit has a float much like your toilet which could stick or fail to move.
It sounds as if the fuel tank sending unit is faulty. This is a small float connected to a variable resistor on the fuel pump/sending unit assembly. Unfortunately this assembly is fairly expensive (over $300) and the fuel tank may need to be removed to replace it.
This problem is caused by a defective fuel gauge level sending unit, the sending unit is located inside the fuel tank and is part of the fuel pump assembly (known as the fuel pump module) and not sold separate from the fuel pump. To replace the fuel pump module you must remove the fuel tank from the car.
CK THE FUEL GUAGE BY GROUNDING SENDING UNIT GUAGE WIRE IF GUAGE GOES TO FULL SUSPECT BAD SENDING UNIT IN TANK ,BUT I HAVE SEEN THESE HAVE BRASS FLOATS AND THEY WILL FILL UP AND SINK TO THE BOTTOM TO INDICATE EMPTY
should be a grey wire going to the top of fuel tank connects to fuel guage / when the guage in the tank reads grounded it shows full , no ground it shows empty. if you ground that grey wire and the guage jumps to full then faulty guage if nothing maybe bad ground on the tank itself. the guages are a reostat like a tyco race car gun the more it moves the more it grounds .. good luck
the temperature sending unit on a 97 grand prix 3800 gt(which is also the coolant temperature sensor) is not accurate. the sending unit part of this sensor only sends info to the guage on the dash. the coolant sensor part sends info to the computer of the car. it is located under thermostat and somewhat difficult to get at. i had put a brand new one in and my temperature on my dash is all over the place---even with good thermostat and properly bled system. when i hook up a scanner to my computer, the coolant sensor is sending the computer(ecu??) what seems to be the right temp. anywhere from 194 degrees to 217 when hot. the guage however on dash go from 160 to 260 in less than 2 minutes.
sending unit in tank may be shorting out or the wire to tank is shorting try removing plug connection and applying some electrical cleaner and plug in and remove 4 or 5 times to clean plug contacts they may be dirty worst case replace sending unit in tank.