Thanks Shane. I did pick up the '66 truck shop manual at Carlisle yesterday. It says the capacity
is 20.5 gal.. The tank looks smaller than that. I havn't run it to empty yet. Don't want to take any chances, the gauge is a little squirrelly at times. But, now I have the wiring diagram. Gonna check that out today. If you do contact your friend, see if he agrees with the 20.5 gal..
Thansk again,
Jim Sgrig