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Chris
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 3171
Experience:  Jeep Certified Master Tech
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87 Jeep wrangler Fuel gauge pegs to full when key is turned.

Customer Question

87 Jeep wrangler
Fuel gauge pegs to full when key is turned . disconnected sender connector near tank and guage still goes to full. Measured 78 ohms resistance at this connector between middle yelllow wire and black wire.
Submitted: 8 months ago.
Category: Jeep
Expert:  Jerry replied 8 months ago.

Hello and welcome. My name is ***** ***** you for visiting the site.

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What does it do if you ground the tan wire at the sender?

Customer: replied 8 months ago.
Plug the connector together and jump the tan to the black wire?
Expert:  Jerry replied 8 months ago.

You should actually try to use a test light with it unplugged, (tan to ground, through the test light) if possible.

Customer: replied 8 months ago.
When the sender is disconnected and I jump tan to black the gas gauge needle moves slightly but doesn't go past E. When I remove the jumper it pegs the needle
Expert:  Jerry replied 8 months ago.

I see, thanks. Do you know if the black wire is a good ground? Does it go down to the E mark when jumped?

Expert:  Jerry replied 8 months ago.

It sounds like it could very well be the sending unit, however there is a test for that to be sure.

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If you accept my additional service request for your email address, you can give me your email in a private info box and I'll send you the test instructions in a PDF file, the file is rather large.

You will just have to accept the additional service offer and ENTER your email address in the “ENTER CONTACT INFO” section so that I can see it.