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Old 02-05-2013, 08:16 AM   #1
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Fuel level guage

Hi guys,
This past week I replaced my tag axle air bags due to a rupture of one of them. In the process, I needed to move/relocate some wiring in order to fit a breaker bar into the tight space the air bags lived in. This install went fine but now I find my fuel gauge pinned on empty. It had been working AOK until this repair, so I got to believe I wiggled something loose. Does anyone (Subford ) have a schematic of where the wiring runs from tank to guage, color-code chart, etc etc. ?
Hoping it's something simple but I'm working with an OEM fuel pump-sender assm.

Thanks, Peter
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Old 02-05-2013, 09:34 AM   #2
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Sounds like the fuel gauge wire is shorted to ground.

This should be close to the wire of your MH.
The wire you are after is the yellow wire with a white strip, circuit #29.

And another way to look at the wiring:


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Old 02-05-2013, 04:45 PM   #3
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Thanks Bill, these will have me looking in the right places. Will report back what I find but I'm hoping the yellow/wht stripe wire is the issue.

Peter
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Old 02-05-2013, 05:11 PM   #4
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This may help also:


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Old 02-07-2013, 05:55 PM   #5
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Spent a frustrating morning on the creeper today. Using a mirror to see the top of the fuel tank and attempting to trace wiring. No joy! Just couldn't see anyplace where the wiring looked compromised. Retracing my steps from the air bag install showed I only messed with wires coming from the air bag compressor, no problems there.
This just might be my time for replacing the OEM fuel pump/sender/level assm.
Just topped off too!!!

Peter
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Old 02-07-2013, 07:11 PM   #6
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Unplugging C218 should make the gauge peg passed full with the key on.
If it does not peg passed full it is not in the tank sender.
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Old 02-08-2013, 07:03 AM   #7
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Thanks for that info Bill. I'll check that later today and report back what happened.
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Old 02-08-2013, 10:59 AM   #8
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Not a short, but an open, Sounds like when the bag blew it broke the wire and/or caused it to become disconnected from the sending unit.

Shorted on most systems causes a "Fuller than full" reading.
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Old 02-08-2013, 11:00 AM   #9
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Hi Bill,
I found C218 and disconnected it, turned the key on and my fuel guage went passed the full mark. Just so I fully understand; this test eliminates anything inside the fuel tank as being a problem?

Peter
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Old 02-08-2013, 01:16 PM   #10
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Quote:
Originally Posted by wa8yxm View Post
Not a short, but an open, Sounds like when the bag blew it broke the wire and/or caused it to become disconnected from the sending unit.

Shorted on most systems causes a "Fuller than full" reading.
Your thinking is backwards.

Low resistance (short to ground), low fuel and gauge reads low (empty).
High resistance (open), full tank (high fuel) and gauge read high (full).

Did you not read the note in post #2 above?
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Old 02-08-2013, 01:21 PM   #11
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Quote:
Originally Posted by Lt46 View Post
Hi Bill,
I found C218 and disconnected it, turned the key on and my fuel guage went passed the full mark. Just so I fully understand; this test eliminates anything inside the fuel tank as being a problem?

Peter
No it is just the opposite.
Your float has sunk or the gauge wire is shorted to ground between C218 and the tank.
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Old 02-08-2013, 01:52 PM   #12
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Well that's not what I wanted to hear! LOL
As much as I wanted to avoid dropping the tank it appears it is inevitable. When that happens you can bet on me replacing everything and anything that lives inside that tank! Now I need to go for a nice long ride to burn off some of those 75 gallons I just put in. Thanks for your help Bill!!!
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Old 10-06-2013, 08:38 AM   #13
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Just to wrap this thread up I thought I'd post my findings. Once the tank was dropped it became obvious as to why my fuel gauge no longer worked. Critters, #*@%# critters!
Between the pine needles, acorns and plastic wiring shards some little bugger had himself a nice little hide-away.
Long story short is the wiring was repaired, new pump/sender assembly installed along with new fuel line from tank to genset. All is well!
This case is closed.
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