Personally, I never replace a part unless I know it's bad - the only exception being ECU's that can't be tested. Even then, I like to verify it's bad before I put the new one in.

Of course, if you don't have the equipment to test things properly, you're in a tough spot. I've seen plenty of crank sensors that ohmed fine, but produced sporadic readings on an O-scope.

As far as ruling out the fuel pump relay, I wouldn't be too hasty. If you were driving with it and it stalled, and then you put it back in and it worked, that's not exactly proof that it's working exactly as it should - after all, the FP relay controls more than just the FP itself.

__________________
A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.