dont forget to check your tank taps - i had a small airleak in tank taps that cut my engine
a few times before i replaced them - think the new ones cost about $15 for a pair from a plumbing
supplier. The other airleak i had was in the upside down placement (by me) of the rubber seal on the fuel filter
Someone else pointed this out a while ago -if you're going to start replacing things on the basis of guessing what might be the problem, start with the cheap
stuff - hoses, filters, copper washers, etc. i dont even stop to think about replacing all the rubber hoses in my system if i find even the slightest suspicion of wear in any part of it. In checking the fuel
supply lines everything should be absolutely bone dry - any tiny evidence of dampness is probably an airleak in the making if not already happening.
in specific regard to the fuel lift
pump - well, i have a spare old one since i replaced it with an expensive new one at the time of the tank tap problem - i didnt mind because it was probably 35 years old but in my experience those lift
pumps very rarely need replacing.