If all your joints are tight, the pump should have no trouble pulling from the top of the tank.
Later pickups ('54 and up) with the tank mounted in the cab had top connections, as well as the larger trucks that had tanks mounted at the frame.


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.