04 Avalance fuel sending unit issue

[kspickard]

Randomly the fuel gauge will drop to empty and then eventually recover to actual tank volume. Has anyone had a similar issue? Also, does this sending unit also tell the generator not to start due to low fuel?

[Ljwt330]

Originally Posted by kspickard

Randomly the fuel gauge will drop to empty and then eventually recover to actual tank volume. Has anyone had a similar issue? Also, does this sending unit also tell the generator not to start due to low fuel?

I don’t know if the Avalanche has different sender and gauge set up than the Limited, but what you describe sounds like a sender issue. There are times when my gauge will do a similar thing, but it is always when about 1/2 tank is left, never from a full reading. I chalk it up to the baffles and volume in the tank as well as the mechanics of the sender. Sometimes, the opposite will happen—the gauge will rise to a higher level than I know is possible, but will return to relative accuracy a while later. Again, always when tank is far below full or even 3/4 full.

I don’t think the gauge or sender are related to the generator starting. That is from the depth of the generator pick up tube inside the tank. Avalanche may be different.

[DrDaveMA]

Normally the signal to the genny is no fuel.

On the intermittent fuel gauge, check the connection at the sender and the ground.