personally i wouldn't even touch the pump, its very unlikely to be the cause . your more likely to do more harm than good.
if you want my view,
1/ drag it up the road and bump start it
2/ jump it direct off another truck , but leave it charging for an hour before you try starting . use easy start too . these trucks dont respond well to jump starting so you need the grounds direct to engine and not battery for best chance
if that fails
rig up a fuel supply gravity fed direct to the pump. like an intravenous drip set up or sumink.
that will eliminate any fuel supply issues.
my vote is the throttle assembly , push the accelerator up and down for 10 mins to clean the connections that has usually been the problems ive experienced with these trucks not starting .
but failing that sell it to me :augie
