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Fuel guage

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Old Aug 7, 2013 | 07:03 PM
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Fuel guage

I just bought the truck and when i went to fill it up the tank was full up to the bottom of the neck, but the guage only reads half a tank. any help would be helpful.
 
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Old Aug 7, 2013 | 07:33 PM
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Many things it could be but it's probably in the tank. Either the electrical part of the "sender" unit or the hollow brass float attached to it got a pinhole leak in it and has a little gas in it. Can't float to the top. First, with key on, ground the wire at the sender and see if the gauge swings all the way over.
 
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Old Aug 7, 2013 | 10:28 PM
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It could also be an aftermarket sending unit. They don't have the proper ohms to match the original fuel gauges.
 
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Old Aug 8, 2013 | 02:04 PM
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Originally Posted by JEFFFAFA
Many things it could be but it's probably in the tank. Either the electrical part of the "sender" unit or the hollow brass float attached to it got a pinhole leak in it and has a little gas in it. Can't float to the top.
The float is made from two pieces of copper soldered together. Solder breaks down, gas seeps in, float settles towards the bottom of the tank.

C0AZ-9202-B (replaced B7A-9202-A & C0AZ-9202-A) .. Fuel Sending Unit Float / Available from Ford ~ MSRP: $15.94.

Applications: ALL: 1957/79 FoMoCo Passenger Cars/Trucks; 1961/79 Econolines & 1966/79 Bronco's.

Carpenter sells a one piece brass float for about 5 bucks.
----------------------------------------------------------------
OP didn't say if this is the in-cab fuel tank sender or the optional 25 gallon auxillary fuel tank (if so equipped) sender.

Assuming it's the in-cab tank sender:

D7TZ-9275-G (replaced C1TZ-9275-K) .. In-Cab Fuel Tank Sending Unit / Obsolete

Applications: 1961/77 F100/750.

DAVE MOORE FORD in Beeville TX has 1 = 361-358-8877.

NOS PARTS LTD in Waxahachie TX has 2 = 972-937-2201.

GREEN SALES CO. in Cincinnati OH has 4 = 800-543-4959.
 
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