Dear JK: Why does my fuel gage not alway work. It seems like a
loose connection because it changes at any time when the tank is full or
low. The dealer wants to change the sending unit and fuel pump which is
allot of money. I wondered if it could be the unit in the dash?
JK:
The computer buffers the gauge when in drive or reverse so as not to have so much
movement during vehicle start and stop when the fuel is moving. In park, the gauge will
move according to fuel movement in the tank. If it is very erratic, it sounds like a sensor
problem.
Fuel level senders are a very common cause for this condition. The sensor deteriorates.
There is a bulletin for loss of power to the pcm on 4.3l v6. Probable cause is the ignition
switch. But there are other problems all at once. Temp. gauge, batt. light, and PRNDL
inop.
A bulletin did come out in early 05 for this sensor, after we had seen many of them fail.
Also need to check that the harness and connector on top of the sending unit not
burned.
Back
loose connection because it changes at any time when the tank is full or
low. The dealer wants to change the sending unit and fuel pump which is
allot of money. I wondered if it could be the unit in the dash?
JK:
The computer buffers the gauge when in drive or reverse so as not to have so much
movement during vehicle start and stop when the fuel is moving. In park, the gauge will
move according to fuel movement in the tank. If it is very erratic, it sounds like a sensor
problem.
Fuel level senders are a very common cause for this condition. The sensor deteriorates.
There is a bulletin for loss of power to the pcm on 4.3l v6. Probable cause is the ignition
switch. But there are other problems all at once. Temp. gauge, batt. light, and PRNDL
inop.
A bulletin did come out in early 05 for this sensor, after we had seen many of them fail.
Also need to check that the harness and connector on top of the sending unit not
burned.
Back
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