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| | | | Joined: Sep 2019 Posts: 62 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 62 | 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
| | | | | Joined: Feb 2019 Posts: 4,483 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,483 | 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; 01/19/2020 3:02 PM.
Phil Moderator, The Engine Shop, Interiors and Project Journals1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc BrakesProject JournalsStovebolt Gallery Forum | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | 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... | | | | | Joined: Dec 2019 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2019 Posts: 36 | 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. | | |
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