ahh fergot, AD's don't have the fuel pickup tube on the sender, no sock, I guess that's why some folks like filters before the pump .... I don't like them there because pumps are gravity feed, they don't suck as well as they blow, easier to get a fuel delivery problem and the filter isn't real visible, easy to forget to check it- the factory position is easily visible and sufficient if checked regular, ANY flakes in it indicate potential trouble, doesn't help to have more filters if what you need is a new tank before it starts leaking
one way to check the tank is drain it at least a bit and see if there's any solids showing - with the under seat tank you might get an idea of condition thru the sender hole, rusty tanks aren't unusual in these ol trucks and large flakes can plug the outlet enough to slow fuel delivery just like a forgotten dirty filter
fuel pumps usually work or not, although they can get weak from a worn lever so it doesn't provide full stroke, or if the flow is restricted [especially on the inlet side] they might not provide full pressure - possible cause, but less likely than junk in the line
Bill
