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gas guage or sender issue?
#1342797 Sun Jan 19 2020 02:42 PM
Joined: Sep 2019
Posts: 57
M
Wrench Fetcher
i have a 1948 3/4 T chevy,and the gas guage show full when the ignition is on, and empty when the ignition is off, regardless of the fuel level in the tank. Is there a test to see if the sending unit is bad? thanks


1948 3/4 ton Chevy Pickup
Re: gas guage or sender issue?
MontanaLee #1342800 Sun Jan 19 2020 03:00 PM
Joined: Feb 2019
Posts: 828
P
AD Addict
The easiest way is to remove the sending unit and ohm it out. It should go from 0 to 30 ohms.

Last edited by Phak1; Sun Jan 19 2020 03:02 PM.

Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: gas guage or sender issue?
MontanaLee #1342811 Sun Jan 19 2020 04:24 PM
Joined: Jan 2010
Posts: 4,519
D
Shop Shark

I pulled my sender ground as a test and the gauge went to full

...click...
What you describe sounds like a bad ground somewhere, either at the sender or gauge.

Check for good clean grounds

Sender should read 30 ohm full
...click...

Re: gas guage or sender issue?
MontanaLee #1343665 Sun Jan 26 2020 01:09 AM
Joined: Dec 2019
Posts: 40
F
Wrench Fetcher
I would remove the sender wire and ground it to a good ground. The gauge should show full. That will rule out the gauge as being bad. Clean the contact on the sender and wire connector to it. See if that works. if still not working . Take a jumper wire with alligator clips and install between a good ground and the ground connection of the sender. If that works then the ground wire is bad. If still not working the sender is bad.


Moderated by  Rusty Rod 

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