Gas Tank Sending Unit Help
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Gas Tank Sending Unit Help
I replaced the gas tank sending unit in my 64 f100. The fuel gauge went up to 3/4 tank so I drove to the gas station and put in 7 gallons and the gauge didn't move. I grounded it but it's kinda makeshift and needs to be done better. Could this be the issue? Thanks
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It's the original gauge and the part is this one. Gas Tank Sending Unit | Dennis Carpenter Ford Restoration Parts I haven't driven enough to see if it goes down yet.
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Joined: Apr 2002
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From: Coal country
What happens when you ground out the wire going to the sending unit? This should make the fuel gauge rise to full. If it doesn't, then you have a wiring issue of some kind.
Also, if the new sending unit came without a new float, did you replace the float with a new one?
Or make sure the old one was not leaking, and was empty before installing it on the new float?
Also, if the new sending unit came without a new float, did you replace the float with a new one?
Or make sure the old one was not leaking, and was empty before installing it on the new float?
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
Assuming the gauge itself is OK, and it probably is, you have to calibrate the sender and gauge. I don't know if the original sending units have this adjustment but the repops do. Drove me nuts trying to figure this out and spent 25 bucks on a CVR and there wasn't anything wrong with the original sender, either? $75 down the drain. But you can learn from my mistake!
Loosen the set screw on the float arm at the sending unit and while holding the pivot pin stationary, rotate the arm up about an 1/8th in. on axis and tighten set screw.
Check that fuel gauge indicates full when arm is resting at the high stop. Adjust as required, if the gauge for example indicates 3/4 with an empty tank just move the business end down. Hope this helps.
Loosen the set screw on the float arm at the sending unit and while holding the pivot pin stationary, rotate the arm up about an 1/8th in. on axis and tighten set screw.
Check that fuel gauge indicates full when arm is resting at the high stop. Adjust as required, if the gauge for example indicates 3/4 with an empty tank just move the business end down. Hope this helps.
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What happens when you ground out the wire going to the sending unit? This should make the fuel gauge rise to full. If it doesn't, then you have a wiring issue of some kind.
Also, if the new sending unit came without a new float, did you replace the float with a new one?
Or make sure the old one was not leaking, and was empty before installing it on the new float?
Also, if the new sending unit came without a new float, did you replace the float with a new one?
Or make sure the old one was not leaking, and was empty before installing it on the new float?
Go figure?
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Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
See the round part where the arm connects with the sender itself? Setscrew for adjustment should be right there. If not, make somethin' happen. Easy peasy. The instructions don't mention this iirc.
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Postmaster
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From: Coal country
Sparks at the gas tank opening would have unpleasant results, of course.
My request to the original poster was to ground out the wire from the gauge, to make sure the gauge and wiring were functioning correctly.
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From: Simi Valley, CA
D7TZ-9275-G (replaced C1TZ-9275-K & D0TZ-9275-A) .. In-Cab Fuel Tank Sending Unit / Obsolete
1961/77 F100/750 - 1963/69 N/NT/T500/750 - 1967/69 F800/1000.
-----------------------------------------------------------------------------
The fuel tank sending unit float is made from two pieces of copper soldered together.
Solder breaks down, gas seeps in, float settles to the bottom of the tank.
The float (C0AZ-9202-B) is the same: 1957/79 Passenger Cars/Trucks - 1961/79 Econoline - 1966/79 Bronco.
This float is available from Ford, but Carpenter sells a one piece brass float that'll never leak for about 5 bucks.
1961/77 F100/750 - 1963/69 N/NT/T500/750 - 1967/69 F800/1000.
-----------------------------------------------------------------------------
The fuel tank sending unit float is made from two pieces of copper soldered together.
Solder breaks down, gas seeps in, float settles to the bottom of the tank.
The float (C0AZ-9202-B) is the same: 1957/79 Passenger Cars/Trucks - 1961/79 Econoline - 1966/79 Bronco.
This float is available from Ford, but Carpenter sells a one piece brass float that'll never leak for about 5 bucks.
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