New Owner
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Fleet Mechanic
Joined: Dec 2009
Posts: 1,620
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From: jus south of nuts
New Owner
Hey all, I recently picked up a 86 F250 rebuilt 351 T18 trans. The truck kicks *** but I have 1 problem I need a little guidance on. the gas gauge doesnt work. I swapped out the rear/front switch, and both the fuel pumps. I was thining the tank valve, if you agree let me know and if so should I replace it with an OEM or a generic? Thanks in advance
Posting Guru
Joined: May 2013
Posts: 1,122
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From: Haysville, KS
Common problem. Bad sending unit or bad gauge itself.
I need to double check (someone chime in) but you can test the gauge by grounding out a lead on the sending unit.
Pretty sure the valve has no effect on the gauge.
I need to double check (someone chime in) but you can test the gauge by grounding out a lead on the sending unit.
Pretty sure the valve has no effect on the gauge.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Right on, Tim. Ground the lead at the tank and the gauge should swing past Full, albeit slowly as the gauge is thermal. And the valve doesn't get involved, but the switch on the HVAC panel does.
The oil pressure, water temp, and fuel level gauges all share the Instrument Cluster Voltage Regulator, so if any one of those gauges work the ICVR is working.
The oil pressure, water temp, and fuel level gauges all share the Instrument Cluster Voltage Regulator, so if any one of those gauges work the ICVR is working.
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