I assume you are looking for somewhere to draw fuel from the truck's fuel tank for the generator? And no open port to plumb to? A couple of ideas from my racing days... of course the best way would be to weld in a new threaded bung for your generator line, but that gets to be a pain in the ass as you have to drain and purge the tank of all diesel residue, which normally means removing it and filling it with detergent water to be sure before you can weld. They also make a bolt in bung like they use on race car fuel cells. Basically a one sided bulkhead fitting. Catch is you need access to the inside of the tank with one hand and a wrench to put the fitting through and hold it while you tighten the nut on the outside. Don't know if your filler is gig enough, or maybe the port for the sending unit? You would also need a fairly flat surface for the gasket/oring to seal. Don't know if you are working with a round or square tank. Either way, be sure to put the fitting somewhere reasonably above the bottom of the tank so you can't run the tank dry with the generator, and there will always be a reserve to drive the truck.
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