cranetruck

Here I go bringing up the fuel tank grounding again, but who knows...Anyway, the fuel tank is isolated from the frame by strips of liner on the supports and is grounded via one wire, #79, which connect the connector housing on the fuel pump to the frame.
The tank itself is grounded via the mounting screws on the fuel pump plate, there are like 8 of them.
The fuel level sending unit is grounded via its mounting screws to the tank, which must be grounded via the fuel pump as explained.
It's very easy for the ground to have a break in this "chain" of grounds, check them! I'm sure many fuel pumps and level sendinding units are replaced because of a poor ground.

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Bjorn

MEP-018A (needs new generator head)

Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake and more. (SOLD)
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".

"Some things can't be made better, just differently......a lot of things actually"