Bounty Hunter Posted May 10, 2006 Share Posted May 10, 2006 My fuel guage is reading in reverse, from E to F as I drive (I wish it were true, but yes, I'm burning gas not gaining any). Would this be a simple fix by reversing the two leads from the sending unit (the two opposite the ground)? I run an '88 4.0L shortbed and swapped in a fuel sending unit from a '91 2.5L longbed (same part number). I then swapped in the full-guage guage cluster in place of the idiot light cluster. I don't remember which direction the old fuel guage swept, but I'm pretty sure it worked correctly. Anybody else experience anything like this? Link to comment Share on other sites More sharing options...
ROADLESS Posted May 10, 2006 Share Posted May 10, 2006 About the only thing i can think of is the ground. Theres also a screw on the back of the gauges circuit board labled 'FU'. Is this another fuel ground, try see if its making good contact. Thats all i can come up with :???: . Link to comment Share on other sites More sharing options...
Bounty Hunter Posted May 11, 2006 Author Share Posted May 11, 2006 I can't imagine it being the ground, as it appears to be working fine other than sweeping backwards. Link to comment Share on other sites More sharing options...
Pete M Posted May 11, 2006 Share Posted May 11, 2006 In 91 the gas gauge was reversed. Or was it the fuel pump? I don't know for sure, but the change happened in 91 and that's why your needle is reversed. Link to comment Share on other sites More sharing options...
Bounty Hunter Posted May 11, 2006 Author Share Posted May 11, 2006 The only thing I have '91 or newer is the fuel pump. Think i could reverse the leads or am I FUBAR'd until I get a different fuel sending unit? Link to comment Share on other sites More sharing options...
Pete M Posted May 11, 2006 Share Posted May 11, 2006 Then it must have been the entire sending cuircut that was switched. Not sure if swapping wires would fix it or kill it. :???: Link to comment Share on other sites More sharing options...
Bounty Hunter Posted May 11, 2006 Author Share Posted May 11, 2006 I was thinking there were two wire leads from the sending unit, not counting the ground clipped to the outside of the sending unit. If I can find out what signals the leads send, I may be able to switch them and straighten this thing out. Link to comment Share on other sites More sharing options...
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