question about lucas pump

[Dan!]

Air getting into the pump. If you put a bit of clear pipe from the top of the filter housing to the pump you will probably see air bubbles in it while the engine is running. Basically means you have a leak somewhere. Squeeze the hand fuel primer until it goes hard then keep trying to squeeze it and you should hear hissing, look all around the fuel line, fuel filter, pump etc and find out where its leaking.