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Old 05-21-2017, 01:57 PM   #1
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Fuel pump gauge reading stuck on full

Fuel garage issue or sender unit???
Yup another project so is this one of those things where I got to drop the tank .. I if I apply ground to the gauge itself it will slap to empty..
1990 overland 39-40 ft coach looking at tank from underneath looks like I see one wire running to top of tank
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Old 05-21-2017, 02:31 PM   #2
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I have the same problem. My sender is a 0-90 ohm sender. I disconnected the sender wires and an open on the sender wires causes the gauge to read full, a short across pulls it to empty. I added a variable resistor and varied it from 0-90 and my wife said it moved the gauge 1/4, 1/2, 3/4. So it is my sender. I have to burn some fuel off before I can change it. The gauge does give a hint of the volume sporadically - I think I have 3/4 tank and I need to get it to around 1/3.
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Old 05-21-2017, 03:09 PM   #3
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Originally Posted by RKins View Post
I have the same problem. My sender is a 0-90 ohm sender. I disconnected the sender wires and an open on the sender wires causes the gauge to read full, a short across pulls it to empty. I added a variable resistor and varied it from 0-90 and my wife said it moved the gauge 1/4, 1/2, 3/4. So it is my sender. I have to burn some fuel off before I can change it. The gauge does give a hint of the volume sporadically - I think I have 3/4 tank and I need to get it to around 1/3.


Ahh.. well looks like I'm in your boat..how did you perform that's variable test exactly and where you get that resistor?
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Old 05-22-2017, 03:36 AM   #4
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I had the potentiometer (variable resistor) already and used alligator clip jumpers to connect the resistor to the sending unit wires. Then I used a screwdriver to adjust it as my wife watched the gauge.
You could also get a 47ohm resistor and put it across the wires - should show a half tank if you have a 0-90 ohm gauge.
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Old 10-12-2017, 05:29 AM   #5
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Finally got time to tackle this turned out after dropping the tank the feed wire broke from top of the sending unit look like old age I would of never found It if I hadn't dropped the tank plus there was a second cut on the same signal wire further down that appeared to cut by the leveling jack going down at some point well before I got coach repaired wire and all is well just figured I'd up date you guys
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Old 10-12-2017, 01:42 PM   #6
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Thanks for the update and glad you figured it out.
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Old 10-12-2017, 01:50 PM   #7
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Thanks for the update and glad you figured it out.


No worries and me too
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