Fuel gauges
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Joined: Dec 2008
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Fuel gauges
85 F250 diesel
fuel gauges not accurate, goes up and down at will. When reading empty, you still have about half a tank, same for both tanks. Haven't figured out how to get to tank switch on dash.
HELP!
fuel gauges not accurate, goes up and down at will. When reading empty, you still have about half a tank, same for both tanks. Haven't figured out how to get to tank switch on dash.
HELP!
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Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Most likely, the tank sending unit is worn out or the float has sprung a leak and filled with gas.
Pull the wire from the sending unit and ground it with the ignition in RUN or ACC, the gauge
should swing fully to the right. Release it and it should swing fully to the left.
If that test passes, the gauge & wiring are OK.
Best way I know of to get at the dash switch is to remove the HVAC controls, this is most
easily done IMHO by first removing the dash pad.
Pull the wire from the sending unit and ground it with the ignition in RUN or ACC, the gauge
should swing fully to the right. Release it and it should swing fully to the left.
If that test passes, the gauge & wiring are OK.
Best way I know of to get at the dash switch is to remove the HVAC controls, this is most
easily done IMHO by first removing the dash pad.
Moderator
Joined: Jan 2001
Posts: 56,966
Likes: 2,728
From: Virginia
If you have a diesel, the wiring for the fuel guage does not go through the switch. The switch tells the frame mounted valve to switch the fuel lines, and the frame mounted valve also has a set of contacts that switch the fuel gauge.
But yes, more than likely your sending units are worn out, and they are very expensive for the diesel.
But yes, more than likely your sending units are worn out, and they are very expensive for the diesel.
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