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I run a lift pump on the chev diesel and when I upgraded it from the conversion supplied unit to the correctly sized unit with good pressure capacity and flowrate, the n/a engine performance changed instantly. The response was better and the grunt also. I did buy and fit one of the bulb primers however it is now redundant as the lift pump does the prime when I change filters - and injectors and pump for that matter. I find the precharge of diesel at pressure to the IP essential to ensure the IP is not starving. By that I mean, at wide open throttle, the original pump was rated at 6PSI and unknown volume. I swapped to an Aeroflow at 16psi and 140GPH capacity - which I honestly doubt thru a 5/16" LINE - but for the discussion, find I idle at 12psi precharge to the IP and 10psi WOT, so the pump never starves. Also, the return flowrate is around 90% of pump flow back to the tank. This has a cooling and lubrication function I understand.
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