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I B back. Fuel gauge "again"? #2724836
12/17/19 02:31 PM
12/17/19 02:31 PM
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Halifax, VA.
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moparjack44 Offline OP
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Hot rod, 48 DeSoto, 1st Gen 392 Hemi.
I bought new Stewart Warner fuel gauge and tank fuel sending unit. OHMS same for both. 1st installed, worked perfect. Now reads full all the time? Original 16 gallon tank. Any body have any suggestions.
Jack


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2724839
12/17/19 02:33 PM
12/17/19 02:33 PM
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Bend,OR USA
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Cab_Burge Offline
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Sounds like the sender is stuck in the up position scope shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: I B back. Fuel gauge "again"? [Re: Cab_Burge] #2724865
12/17/19 03:43 PM
12/17/19 03:43 PM
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Halifax, VA.
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moparjack44 Offline OP
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Originally Posted by Cab_Burge
Sounds like the sender is stuck in the up position scope shruggy

Agree, but when ignition off, reads E.
I took gauge, hooked Source terminal on gauge directly to fuel tank sending terminal, power wire directly from battery to IGN terminal on gauge, and ran ground directly from Negative on battery to GRD terminal on the gauge. Same results gauge went to full, unhooked IGN terminal, went to E?


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2724869
12/17/19 03:56 PM
12/17/19 03:56 PM
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Grand Prairie,Texas
stumpy Offline
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When you remove the power it will automatically go to empty. If the float is stuck up then it will always read full. Bang on the tank near the sending unit and see if that makes the float drop. If not then pull the sending unit and see why it is staying up.

Re: I B back. Fuel gauge "again"? [Re: stumpy] #2724918
12/17/19 08:22 PM
12/17/19 08:22 PM
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Halifax, VA.
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moparjack44 Offline OP
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Originally Posted by stumpy
When you remove the power it will automatically go to empty. If the float is stuck up then it will always read full. Bang on the tank near the sending unit and see if that makes the float drop. If not then pull the sending unit and see why it is staying up.


Sounds simple enough, even for me. I'll be on it first thing tomorrow. Thanks. Any other thoughts, appreciated.
Jack


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725003
12/18/19 12:22 AM
12/18/19 12:22 AM
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Grand Prairie,Texas
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Before removing the sending unit unhook the sending unit wire that feeds back to the dash gauge. If the gauge goes to full with that disconnected then the wire is grounded somewhere between the gauge and the sending unit. If the gauge doesn't go to full then the issue is the sending unit itself.

Re: I B back. Fuel gauge "again"? [Re: stumpy] #2725056
12/18/19 09:43 AM
12/18/19 09:43 AM
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Halifax, VA.
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moparjack44 Offline OP
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Originally Posted by stumpy
Before removing the sending unit unhook the sending unit wire that feeds back to the dash gauge. If the gauge goes to full with that disconnected then the wire is grounded somewhere between the gauge and the sending unit. If the gauge doesn't go to full then the issue is the sending unit itself.


"the wire", meaning the wire from the sending unit? Will check. If that happens, any suggestions where to look for the ground? Could it be possible that if there is no rubber gasked between the sending unit ring and where it fits on the tank?
Jack.


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725089
12/18/19 11:28 AM
12/18/19 11:28 AM
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Halifax, VA.
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moparjack44 Offline OP
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When I unhooked "the wire", still went to full when I turned on the ignition. Give me some places to check for grounding? I'm back to garage to remove sending unit, maybe?


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725092
12/18/19 11:48 AM
12/18/19 11:48 AM
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Pulled the sending unit. There is a rubber gasket between sending unit base and tank. I moved the float arm, up, middle and down, gauge stayed on full????.


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725097
12/18/19 11:58 AM
12/18/19 11:58 AM
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moparx Offline
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you now get the fun of tracing the wire from the tank to the dash gauge to find the spot that wire is touching ground.
it may not be fun, but it's the only way to start the repair process.
beer

Re: I B back. Fuel gauge "again"? [Re: moparx] #2725111
12/18/19 12:54 PM
12/18/19 12:54 PM
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Grand Prairie,Texas
stumpy Offline
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Like I said you have the sending wire shorted somewhere between the tank and the dash.

Re: I B back. Fuel gauge "again"? [Re: stumpy] #2725119
12/18/19 01:07 PM
12/18/19 01:07 PM
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Lincoln Nebraska
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unplug the connector behind the drivers kick panel & see if the gauge still pegs when you turn the ign on. this'll tell you whether to move upstream or downstream from that connector to locate the improper grounding


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Re: I B back. Fuel gauge "again"? [Re: stumpy] #2725198
12/18/19 07:44 PM
12/18/19 07:44 PM
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Halifax, VA.
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moparjack44 Offline OP
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Originally Posted by stumpy
Like I said you have the sending wire shorted somewhere between the tank and the dash.


Confirmed. Hook everything up straight, gauges works. As I moved the float, gas gauge needle moved accordingly. Tomorrow I will trace the sending unit wire and replace from end to end. Times like this, a lift would sure come in handy. At 75 years old, crawling under a lowered hot rod, not fun, nor easy. violin.


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725489
12/19/19 10:17 PM
12/19/19 10:17 PM
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Halifax, VA.
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I got lucky. Found the break in the sending unit wiring, only a couple feet from the tank. Replaced the wiring, hooked everything back up, gauge working accurately. Thanks to everyone for your help.

Jack


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725491
12/19/19 10:22 PM
12/19/19 10:22 PM
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Grand Prairie,Texas
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Glad you found it so easily.

Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725548
12/20/19 08:43 AM
12/20/19 08:43 AM
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Originally Posted by moparjack44
I got lucky. Found the break in the sending unit wiring, only a couple feet from the tank. Replaced the wiring, hooked everything back up, gauge working accurately. Thanks to everyone for your help.

Jack


Smart move there, too many would have just butt spliced it together. Odds were good another break was fixing to happen.

Re: I B back. Fuel gauge "again"? [Re: stumpy] #2725564
12/20/19 09:41 AM
12/20/19 09:41 AM
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Halifax, VA.
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Originally Posted by stumpy
Glad you found it so easily.


Thanks to help from MoParts members. The only hitch on the wiring, at the tank unit, wire Red, then as I traced, spliced into Green, the spliced into White for the gauge connection. down


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Re: I B back. Fuel gauge "again"? [Re: moparjack44] #2725589
12/20/19 11:12 AM
12/20/19 11:12 AM
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north of coder
moparx Offline
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glad it was easy to find and repair ! boogie
now with that said, did you go a ways further than the repair to see if the wire is getting brittle on the insulation ?
beer

Re: I B back. Fuel gauge "again"? [Re: moparx] #2725596
12/20/19 11:35 AM
12/20/19 11:35 AM
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Mesa, Arizona
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Electric gauge? The sender may not be compatible with the gauge. Fought that with my tank relocation. Talked with a tech at Tanks Inc. and he said I needed a gauge (Autometer) computable with the sender I had. Problem solved.

Last edited by dart4forte; 12/20/19 11:37 AM.

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