Question about 1987 Ford Bronco II

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1987 ford Bronco II fuel gage doesn't work-reads empty all time

Replaced the fuel pump in the tank with a sending unit (new) and that didn't fix the problem. Connections seemed clean and fine at the tank. Traced wiring with Haynes manual under the hood; a yellow w/white stripe wire should be the + wire from the sending unit of the fuel tank. I hooked a test light (ground was to the neg of the battery) to the back of the connector of this wire (under the hood by the firewall) and got about 1 second flashes and the fuel gage read about 1/2 tank (I think it should be 3/4 full as I filled it up and haven't ran it that much). Thought it must be a ground issue so hooked jumper wire from ground to the y/w wire and it pegged out past full on the fuel gage. Hooked VOM to the backside of the yel/wht wire at the connection under the hood by the firewall and it jumps from 0 to about 6-8 volts on an analog meter (still about 1 second between jumps). It appears the sending unit in the fuel tank is putting out a signal but it is not registering on the fuel gage. I have not pulled the yel/wht wire out of the wiring harness loom under the vehicle to check for shorts (or the black ground wire either for that matter). What should be done next?

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  • Boy_Hart Dec 26, 2008

    My fuel gauge reads full when full, but by the time the tank is half full, the gauge shows it is empty. I seem to have a ground problem with the radio, cruise control and tack also. These items are sensitive to road bumps and can be affected by hitting the dashboard. Are these problems related or separate. Any answers?

  • DavidHard4 Jan 21, 2009

    This one only has a temperature gauge and fuel gauge; neither one works. Everytyhing else is idiot lights (speedometer & tachometer work.) What does the regulator look like and how do you test it?

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I need to know if the other gauges are accurate. There is a voltage regulator mounted on the back side of the dash that can go bad and often does, that will make the other gauges inaccurate also.

Posted on Dec 02, 2008

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