['68OrangeSunshine]

Is there an RTV that's impervious to fuel fumes?
Especially the concoctions they pass off now as ''gasoline.''
Disconnect Batt.
Empty your tank, pull the seat, back or out, which ever works.
With a brass drift pin and light ball pien [no sparks], tap your sender unit out by the 3 lugs, tapping each in succession.
Apply suitable goop to mating surfaces. Re-insert sender and tap back on.

Of course, I'vs seen bad, decomposing filler neck grommets give the same gripe, usually after a sloppy top off.

I hate to see anybody chicken out from using the behind-the-seat-tank. That used to be one of the key points of being a Danger Boy, that you coolly leaned back on 20 gallons of one of the most explosive carburants known to man, and didnt give A F.

To me, putting the tank in the bed is like screwing on training wheels. "...God forbid little Johnny should scrape his knees learning to ride..."

I had a '67 K/10 Suburban and still run a K/5. Even in in the shorter wheelbase '71 Jimmy, sometimes the fuel flow is an issue with the belly tank. In the 127'' wb Sub, it was a major pain. I had to run a 90 gph Holley Red pump in the end.