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| | | | Joined: Apr 2008 Posts: 899 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 899 | With key on, engine not running my gauge reads 1/2-3/4 full. Start the engine and it goes to full. Is the engine off reading most likely more accurate?
Ed
| | | | | Joined: Oct 2021 Posts: 6,729 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,729 | I doubt either can be relied upon for accuracy.
What does the gauge read when you fill the tank all the way up the filler neck?
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Sep 2009 Posts: 5,793 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,793 | Ed, The reading on the gauge should not change once the engine starts. On is On, engine running or not. A change once the engine starts is an indication that something is not quite right. Time to do some investigating. 
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
| | | | | Joined: Feb 2019 Posts: 4,472 AD Addict & Tinkerer | | AD Addict & Tinkerer Joined: Feb 2019 Posts: 4,472 | I write a troubleshooting procedure for gas gauges awhile back, and it was made into a sticky thread at the top of this forum. Here is a [LINK]
Last edited by Phak1; 12/05/2022 12:51 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: Apr 2008 Posts: 899 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 899 | Everyone, thanks for inputs. Will check gauge at next fill up and proceed from there. Tks for troubleshooting link.
Ed
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