Fuel system issue

[TEAMJENSEN]

Your fuel tank pickup tube to elbow junction probably cracked from the bump. Common in these trucks. I'm working with a guy right now to make stainless steel replacements which are TIG welded instead of soldered copper.

Bring an outboard fuel tank with primer bulb, plumb that into the lift pump inlet, and use that to get the truck home. Route the return line to it also if you can, or be prepared to keep refilling it during your trip, and make sure your truck tank does not overflow. Redo fuel suction side of the system once you are home.
http://www.steelsoldiers.com/showthread.php?167854-Stainless-Steel-M939-Fuel-Tank-Dip-Tubes-and-Hoses&highlight=
View attachment 680123

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Did you make the stainless dip tubes? I may need it. I'm trying to diagnose now.

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[74M35A2]

I helped a buddy in the sourcing of materials and welding of such. He designed them while he had his tank off and all apart. Member Tedcat should have them in stock, reach out to him. FYI, your tank will have to come off or your bed will have to be raised if you have a cargo truck to install it/them.

They have a male flare (-AN) fitting on them, which is different than the stock inverted (female) flare tank top fitting.

 

[Brutacus]

Check you wiring on your ignition switch, and fuel solenoid. Some of those old crusty wires can brake loose from a little bump.