Sending unit bad?
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Staging Lane
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Joined: Jun 2008
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From: College Station,Tx
Sending unit bad? I am driving and my gas gauge goes from full to past empty and my check gauges light turns on my 01 Camaro SS, eventually it will go back up but does this constantly now. At first it didn't bother me as it didn't do it that often but now I'm noticing that it's doing it more and is throwing my gas reading off. Is this the sending unit going bad or can I check something else. If it is the sending unit do I have to buy a new fuel pump and unit or can I buy it separate?
Thread Starter
Staging Lane
iTrader: (9)
Joined: Jun 2008
Posts: 89
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From: College Station,Tx
It should have a continuity setting that, when you connect the leads from the meter together or to 2 different parts of the same circuit, will cause the meter to make a beep or somehow let you know that what your testing has continuity (is the same circuit).
If the wire is shorted to ground, witch will cause false readings on the gauge, it would have continuity with ground since it essentially becomes part of the ground circuit. Like I said though you will need to make sure that the gauge is giving the false reading when you test it otherwise it will not have continuity with ground and therefore pass the test, of course assuming this is the problem to begin with.
Your going to need to pull the gauges and find the signal wire, usually on a GM is it the purple wire at the tank but I don't know about behind the dash, you'll need a wiring diagram to find that out. I guess you could test at the tank, or even easier under the rear seat where the F/P harness comes inside the car.
I'm not really the best at explaining things on the internet but hopefully you can make enough sense of this to help some.
If the wire is shorted to ground, witch will cause false readings on the gauge, it would have continuity with ground since it essentially becomes part of the ground circuit. Like I said though you will need to make sure that the gauge is giving the false reading when you test it otherwise it will not have continuity with ground and therefore pass the test, of course assuming this is the problem to begin with.
Your going to need to pull the gauges and find the signal wire, usually on a GM is it the purple wire at the tank but I don't know about behind the dash, you'll need a wiring diagram to find that out. I guess you could test at the tank, or even easier under the rear seat where the F/P harness comes inside the car.
I'm not really the best at explaining things on the internet but hopefully you can make enough sense of this to help some.
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Thread Starter
Staging Lane
iTrader: (9)
Joined: Jun 2008
Posts: 89
Likes: 0
From: College Station,Tx
It should have a continuity setting that, when you connect the leads from the meter together or to 2 different parts of the same circuit, will cause the meter to make a beep or somehow let you know that what your testing has continuity (is the same circuit).
If the wire is shorted to ground, witch will cause false readings on the gauge, it would have continuity with ground since it essentially becomes part of the ground circuit. Like I said though you will need to make sure that the gauge is giving the false reading when you test it otherwise it will not have continuity with ground and therefore pass the test, of course assuming this is the problem to begin with.
Your going to need to pull the gauges and find the signal wire, usually on a GM is it the purple wire at the tank but I don't know about behind the dash, you'll need a wiring diagram to find that out. I guess you could test at the tank, or even easier under the rear seat where the F/P harness comes inside the car.
I'm not really the best at explaining things on the internet but hopefully you can make enough sense of this to help some.
If the wire is shorted to ground, witch will cause false readings on the gauge, it would have continuity with ground since it essentially becomes part of the ground circuit. Like I said though you will need to make sure that the gauge is giving the false reading when you test it otherwise it will not have continuity with ground and therefore pass the test, of course assuming this is the problem to begin with.
Your going to need to pull the gauges and find the signal wire, usually on a GM is it the purple wire at the tank but I don't know about behind the dash, you'll need a wiring diagram to find that out. I guess you could test at the tank, or even easier under the rear seat where the F/P harness comes inside the car.
I'm not really the best at explaining things on the internet but hopefully you can make enough sense of this to help some.
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Verdad Gallardo Yeah its a common problem, the sending unit is a very simple thing and doesn't often go bad, it does happen though, but much more often the signal wire will rub a hole in the insulation and cause exactly what your describing.