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  #1  
Old January 31st, 2015, 11:32 PM
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Mark Lorman
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Jumping fuel gauge

My 97 fuel gauge bounces all over the place. Ground? Sender? Can you replace the sender without buying a new pump?
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  #2  
Old February 1st, 2015, 12:09 AM
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Neill Thornton
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Well, the fuel sender gets its ground from the infamous K108, the big ground lug on the passenger side of the bulkhead in the engine compartment, like 75% of the truck.

If you aren't seeing any other electrical issues, I would assume the sender is going bad.

I believe it's an integral unit.
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Old February 1st, 2015, 12:57 AM
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On the 1997, The fuel SENDER gets grounded on the right side of the transfer case, the fuel GAUGE gets grounded where Neil says in post # 2

The fuel level sender (in the tank) is NAS specific (I tried an RRC & it did not show the correct level)
The only way I know of to get a correct NAS sender is to buy the whole fuel pump/ sender assembly, and it's not cheap!
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  #4  
Old February 1st, 2015, 09:25 AM
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Mark Lorman
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Jumping does not appear to be related to the vehicles movements. It pretty much jumps all the time.
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Old February 1st, 2015, 11:14 AM
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Jason England
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I would guess lose wire or faulty ground. The fuel gauge has 3 wires. A hot as battery voltage reference. A ground and a signal from the fuel tank. Given the fuel tank signal is the hardest to deal with if trace out the other two and make sure they are clean and well connected at both ends.
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Old February 1st, 2015, 12:29 PM
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Neill Thornton
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Quote:
Originally Posted by Viton View Post
On the 1997, The fuel SENDER gets grounded on the right side of the transfer case, the fuel GAUGE gets grounded where Neil says in post # 2
You know, that's what I was going to say, but to be sure my blonde ass wasn't giving bad gouge I went and looked at the wiring diagram and it showed the ground going all the way back to K108.

I just went back again and of course you are right, it was the gauge and not the sender I was looking at. I should have just stuck with my instincts... go figure.
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Old February 1st, 2015, 12:58 PM
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My fuel needle has always flopped around, 17 years worth.
My latest woonky needle problem was because the connector at the tank was loose.
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