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| | | | Joined: Aug 2010 Posts: 605 'Bolter | | 'Bolter Joined: Aug 2010 Posts: 605 | Before asking this question, I consulted my 1963 Chevrolet Truck Shop Manual. Thinking there would be a spec for fuel tank gauge resistance somewhere in the electrical diagnosis section-you know, 'connect VOM to sender and ground, sweep arm from top to bottom and observe resistance which should be X to Y... Bwahahahahahaha nope. Diagnosis procedure is 'get a working Chevy gauge from parts stock, connect it to the truck, and see if it makes the gauge move'.. thanks, GM. Then I consulted my 1965 Chevy Truck Shop Manual Supplement. Nope, not there, either.
Then I searched here, and got 400 results, none of which seemed to match. OK, I only read some of them-but none were really close. Which brings me to now..
..the tank gauge should have a certain resistance value when the tank is full (arm up) and when it's empty (arm down) and that allows a guy to find which new type of unit to buy. The specification is literally not in the Chevy truck service manual.. could anyone enlighten me on this, please and thank you?
Last edited by Tronman; 05/26/2026 8:08 AM.
1965 C60 school bus | 1967 GMC 6500 school bus
| | | | | Joined: Feb 2019 Posts: 4,511 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,511 | I believe most early Chevys are 30 ohms. Classic parts lists their replacement sending units as 30 ohms.
Last edited by Phak1; 05/26/2026 12:10 PM. Reason: Typo
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: Mar 2014 Posts: 4,509 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,509 | Zero ohms when empty and 30 ohms when full should be what you need. Good luck!
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
| | | | | Joined: Feb 2023 Posts: 385 'Bolter | | 'Bolter Joined: Feb 2023 Posts: 385 | My 66 C10 takes 30 ohm if using a stock gauge. | | |
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