How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Chris Your Own Question
Chris, Shop Foreman
Category: Jeep
Satisfied Customers: 3379
Experience:  Jeep Certified Master Tech
Type Your Jeep Question Here...
Chris is online now
A new question is answered every 9 seconds

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: 1 year ago.
Category: Jeep
Expert:  Jerry replied 1 year ago.

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


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

Customer: replied 1 year ago.
Plug the connector together and jump the tan to the black wire?
Expert:  Jerry replied 1 year ago.

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

Customer: replied 1 year 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 1 year 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 1 year ago.

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


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.