Finally got the car back together after it stalled and got a really bad brake fluid leak at the same time. I checked both filters and the strainer and it still acted like it was getting starved for fuel. No air in the lines either (replaced them all with clear ones.) Then I checked the oil in the pump, it was low but there was some in there. I topped it off and then the symptoms seamed to disappear. Car seems to be running fine now, don't think I damaged anything. My question now: can pump elements stick if they don't have sufficient lubrication? Or maybe the piston in the lift pump perhaps?

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1973 220D ~135k Mi
1979 Ford F100 300 I6 - 225k Mi