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I think the fuel line has check valves - but don't know where they are.
There are two pumps. Main pump is outside tank, under left rear passenger seat.
Must be working OK becuase if dead, car won't run at all.
Pre-pump is in the tank and has a pickup hose/tube to bottom of tank. If hose or pump is bad it can act up, especially when fuel is low.
Easiest: clean up fuse contacts on fuse in white fuse holder behind battery, on left front inner fender wall. Replace or clean up holder if needed. Fuse rarely blows, but it and the fuse holder contacts get corroded. It supplies power to computer and pumps.
IF you work on the fuse holder, pull the battery ground cable first. If you don't you're pretty much guaranteed to ground the hot wire to fuse holder on the fender wall, makes a really big POP! Fuse holder opens up to access the internal contacts - release the little plastic clips on the narrow ends, then tip back the "head". Or buy a new one at Radio Shack or a waterproof one at a marine supply (overkill in my book, but lotsa guys do that).
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Sven: '89 245, IPD sways, electric rad. fan conversion, e-codes, 28+ mpg - auto tranny. 850 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).
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