On the fuel pump issue... if this truck still has the Rochester carb the fuel pump can't drain it. The fill line goes in the top part of the carb, and the fuel falls into the bottom. There is an air gap between the fuel and the top of the carb so the fuel pump can't siphon the fuel back.
On more than one occaision I have placed my hand over the carb opening to help pull fuel into it. Works well, providing the truck doesn't back fire. And your hand will get a spray of fuel on it.
