Fuel gauge/sending unit

Asked by GuruX3R25 Nov 26, 2018 at 04:40 PM about the 1972 Chevrolet El Camino Base

Question type: Maintenance & Repair

When I fill my car up, it only goes to 1/4 tank, after
awhile it'll move down to E when I'm about out of
gas.... I think... I tested the gauge, gets 12volts and
I can move the needle all the way up to full, and
back to empty with a multimeter. Tested my new
sending unit, read about 55.9 ohms, which is about
half a tank I put it, 0-90 sending unit BTW, when
testing the ground on the sending unit, by
disconnecting the positive, my gauge goes up to
full? It should be E. Is it possible there is a short
somewhere? Do I need a new gauge?

1 Answer
9,530

Mike answered 5 years ago

Gauge should go overfull when disconnecting sender wire and empty when you ground it. Thats a real flat tamk If I remember right the float on the sender may be stuck, double check the tank ground.

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