Fuel guage
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Welcome to FTE! 
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.
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.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
float attached to it got a pinhole leak in it and has a little gas in it. Can't float to the top.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.
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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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