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I need a fuel sedning unit wiring diagram for a 1986 dodge ram d-150. their is no electrical wires running to my tank, so my fuel gauge is reading empty. please help.

The sending unit on my dodge ram d-150 pick up has no electrical wires running to it, so my fuel gauge is showing empty, i need a wiring diagram so i know where to re wire the hot and te ground for the fuel sending unit. please help! thank you!

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  • Christian Federer
    Christian Federer Feb 09, 2012

    I need adiagram, or possiblely a explination on how/where to re wire the sending unit. The ground and hot wires are no longer on the sending unit itsself, they must have been removed by the previos owner.

  • chuck brackett
    chuck brackett Feb 09, 2012

    look on the frame rail close to the tank for a plug or torn wires. what did you find?

  • Christian Federer
    Christian Federer Feb 19, 2012

    I need to know where to wire the hot wire on the actual sending unit itself. Their is no electricity going to my tank at all! Please send detailed diagram

  • Christian Federer
    Christian Federer Mar 17, 2012

    all wires are looking fine.


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Posted on Jan 02, 2017

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SOURCE: 1966 Ford Mustang Gas Guage not working

Hi, sounds like you have checked everything properly and you have a bad tank sender, current when checked with test lamp should pulsate.I suggest replace fuel tank sender.

Posted on Dec 01, 2008

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SOURCE: i have a 1988 F-150

i have the same problem and i replaced the shuttle valve and i fixed the problem it is located on the drivers side frame rail just behind the the main high pressure fuel pump it should have 6 lines going into it and out it is a mechanical part so its not repairiable hope this helps

Posted on Mar 31, 2009

  • 108 Answers

SOURCE: When the gas tank is full the gas gauge shows as

Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.

Posted on Jul 17, 2009

  • 353 Answers

SOURCE: fuel gauge stuck on full

The fuel sending unit in the tank is broken. It acts as a variable resistor that tells your gauge what level the tank is at. When you remove the pos. lead it shows infinite ohms. and when you short it to ground it shows 0 ohms.

Posted on Jul 28, 2009

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