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Sep 20, 2015 | 08:05 PM

87ford1997

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fuel gauge

hey i just recently bought a 1987 ford f150 it has the EFI 302 automatic with 84503 miles on it. and the fuel gauge sits on full when the truck is off and then moves further past full when the truck is turned on. what causes this and how do i fix it?

Sep 20, 2015 | 08:24 PM

Cruiseomatic

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From: Dark side of the sun.

Check your grounds. Is it dual or single tanks? My '87 pegs past full when switched to front tank and I think i have a bad ground with infinite resistance.

Sep 20, 2015 | 08:28 PM

87ford1997

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its dual tanks but the rear tank has been removed and just the front tank remains. and where would my grounds be located at?

Sep 20, 2015 | 08:34 PM

Cruiseomatic

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Really, It could be bad grounds or sending unit. Check your grounds at the tank, selector switch, and at the valve on the rail. You might need to drop the tank and manually move the sending unit float. After 20+ years, things do get dirty and need attention.

Sep 20, 2015 | 08:43 PM

87ford1997

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Ill get under there tomorrow and check the grounds. now the valve on the rail? can you explain to me where that is located and what it looks like?

Sep 20, 2015 | 09:58 PM

87ford1997

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like i know you said itis on the rail but ware abouts on it.. towards the front back middle..i was under there the other day and seen nothing that looked like a valve..thats why i asked.

Sep 20, 2015 | 10:03 PM

Cruiseomatic

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From: Dark side of the sun.

It will be on the rail either directly infront or next to the front tank. It will have a harness connected to it.

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Sep 21, 2015 | 12:40 PM

87ford1997

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okay so I think I found the valve but cant seem to find the ground wire. is there a particular color of wire that I am looking for? and how do I test it to make sure its grounded right?