fuel gauge/sending unit problems
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New User
Joined: Aug 2011
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From: Missoula, MT
fuel gauge/sending unit problems
i have a 78 bronco with a 400 in it.... i had fuel problems, tank was 33gal. it was rusty as well as the sending unit. swapped both out and now the gauge reads full constantly used to not read at all any ideas on what to do???? maybe flip wire connector at the sending unit around??? Or maybe someone has had this prob.:{ Any thing helps.. Thanks.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
It SHOULD read "full" when disconnected. The sending unit alters the NEGATIVE voltage to the gauge. The more fuel in the tank the more resistance and the "fuller" the gauge reads. When the sending unit or the float fails, the sending unit sends a "false positive" if you will. What you can tell is that the gauge is working just fine. The sending unit and/or the float has failed. Time to crawl into the tank and see whats up unless you can confirm that the wiring between the sending unit and the gauge is damaged somewhere/somehow.
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Joined: Aug 2011
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From: Missoula, MT
Figured it out. I checked my wiring. Found a tiny bare spot on the Orange wire grounding out on the frame.....hmm why didn't I think of that first.
Thanks for the replies.
Thanks for the replies.
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Fuel Sending or Gauge issue
So this is my first day on this site so I dont know if this is posting to everyone,here is my question. 1978 Ford F-250 side tank sending unit, mine was rotted and gone,I istalled a new one but now my level after 8 gallons down from full reads empty,I noticed there are two types one that has a 4.8 inch level arm and a 10' level arm,should I try the 10' long one.............Anyone know?
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mr_ranger-79
1973 - 1979 F-100 & Larger F-Series Trucks
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