fluctuating fuel gauge

[vetteman81]

Upon startup in garage, my 1981 Vette shows correct fuel level and is stationary. When moving, the gauge fluctuates below and above correct fuel level, perhaps 1/8 inch or so, back and forth.
Upon stopping, oscillations will gradually subside to rest at correct fuel level. Any help on resolving this problem is appreciated.

[c4c5specialist]

HI there,

How long have you had this issue ????

Has it gotten progressively worse ?????

Does the needle jump erratically or just move smoothly back and forth????

Allthebest, c4c5

[vetteman81]

Issue noticed last fall before winter storage. Still there this spring.
Seems about the same, not progressively worse.
Needle swings smoothly in a small arc, kind of like following the float up and down. Thanks for the reply.

[LLC5]

Originally Posted by vetteman81

Issue noticed last fall before winter storage. Still there this spring.
Seems about the same, not progressively worse.
Needle swings smoothly in a small arc, kind of like following the float up and down. Thanks for the reply.

Sounds like a baffle problem in the tank.

[vetteman81]

Checked gauges fuse-OK.
Checked wiring at sending unit at top of tank-OK.
What do you mean by baffle problem?

[c4c5specialist]

HI there,

There is a baffled area, almost like a small place inside the tank, that the leve sensor sits.

Its almost like 4 walls to keep the gas from sloshing back and forth around the sensing unit.

It would be possible that it has broken loose.

With a very bright flashlight, you may be able to see if its moving around through the filler neck.

Allthebest, c4c5

[vetteman81]

Thanks. Will have to check it out after I see about a new gasket. I appreciate your help.