Fuel tank selector operation
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Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Fuel tank selector operation
88 E350, I am fairly sure the tank switch is non-functional. I have tried to find diagrams or even a description of operation and haven't gotten sufficient information to diagnose the problem correctly.
Does anyone have a good diagram, or even can tell me where the power should be for proper operation? I'd like to make both tanks operational, right now I just have the front.
Also, would this be the same as an 85 F250? I'll need to figure out how to wire that one up soon.
Does anyone have a good diagram, or even can tell me where the power should be for proper operation? I'd like to make both tanks operational, right now I just have the front.
Also, would this be the same as an 85 F250? I'll need to figure out how to wire that one up soon.
Senior User
Joined: Nov 2003
Posts: 298
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From: Saint Maries Idaho
If you just have the front tank, then the switch should be supplying power to the solenoid unless the selector solenoid has stuck. I haven't had to test my 86 diesel but I know on my 83 gasser the front tank is selected when power is supplied to the solenoid and the rear tank is selected when no power is supplied. I would check the power wires going to the selector solenoid on the drivers side frame rail with a test light and see if you are getting power there first.
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