Fule gauge help - Team Camaro Tech
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post #1 of 4 (permalink) Old Jun 18th, 06, 12:07 PM Thread Starter
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Fule gauge help

I'm not great with the electrical side of things so I'm asking for help in checking my work.. I'm trying to solve a fuel gauge problem (68, console) .

Problem--fuel gauge sits at full plus.

steps I've taken:

1. disconnected the line from the sender in the trunk and found:

a. when the line to the gauge is grounded the gauge reads empty--conclusion: guage and line to gauge are ok.
b. connecting an ohm meter to the sender line and find 20 K -- conclusion: sender ok since the tank is under half full and 45 K should be half.
c. make sure that the sender line and the gauge line are making a good connection--then connect them up--gauge sits at full plus.

Overall Conclusion: the ground to the sender is broken at some point?

Am I right to think this or have I missed anything? Is there any good way to deal with a broken ground without dropping the tank?

Many thanks in advance.
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post #2 of 4 (permalink) Old Jun 18th, 06, 12:57 PM
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Re: Fule gauge help

Quote:
Originally Posted by sthoma10
b. connecting an ohm meter to the sender line and find 20 K -- conclusion: sender ok since the tank is under half full and 45 K should be half.
c. make sure that the sender line and the gauge line are making a good connection--then connect them up--gauge sits at full plus.
Sender is NOT ok. GM sending units are 0-90 ohms. You are getting a reading of 20k, which is 20,000 ohms. The reason why it is still at full plus.

Quote:
Originally Posted by sthoma10
Overall Conclusion: the ground to the sender is broken at some point?
I would look at the ground wire first, where it connects to the frame. Make sure it is clean, tight and connected to bare metal. Use a star washer too, it digs into metal to make a better connection.

Greg U

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post #3 of 4 (permalink) Old Jun 19th, 06, 06:17 AM
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Re: Fule gauge help

New or original gage? I had the same problem changed the gage and problem went away.

Steve
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post #4 of 4 (permalink) Old Jun 20th, 06, 08:39 AM Thread Starter
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Re: Fule gauge help

The gagues are original (but maybe not to the car). Some of the wiring suggests that the console was added later.

Thanks.
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