As said the voltage under load needs to be read, as this is when you will have issues.
The reason I measure at the pump is it is very clear to anyone with eyesight what it means, resistance tests are all very well, but the end result is the only one that matters, as why I always measure at the consumer(pump), simulate full load by giving it large in a high gear and watching the volt drop.
Digi multimetres are way more than accurate enough for this test, even a £10 one.
If you get any discernable drop then do a fuel pump rewire, ideally the pump wants to see 13.5, in practice it rarely will due to any joint or conection will cause a resistance, unless it is gold that is, the earth side is as important as the live side and will more than likely show a higher resistance if you want to measure it, I don't bother, I just run a seperate earth direct from the battery, can also branch the rear disco lights bulb holder earth into this wire.
tabetha