Not at all - particularly if you're gonna turbo that thing..... but it really depends on the pump efficiency and somewhat on fuel line size.

If you look at the test results on the VR4 Denso pump that I have, it's pretty bad compared to the larger pumps - which is why the VR4 guys replace their pumps if they run over 10-12psi boost pressure. It seems to me that their problem with the pump is a combination of things - the wire size, length of run, a resistor in the circuit to drop pump voltage at idle, 5/16" fuel line and length of run, boost pressure and an inefficient pump.

I need about 1600 cc/min or 96 l/hr fuel delivery... add a 30% cushion for pump aging/wear to make it say 125 l/hr. The bench test on the VR4 pump (in the comparitive graphs) showed it to be the worst of the tested group and only flows 150 l/hr at 50psi and 125 l/hr at 60 psi..... and that test was performed at 13.5v. <img src="/forums/images/graemlins/scared.gif" alt="" /> Granted, the pump tested was a used one and maybe a little tired, but it shows me that I'd better get plenty of voltage to it if I want enough fuel.

I wanted to use an in-tank pump that would fit without major modification and was guessing it would at least fit with minimal modification when I ordered the pump. I got very lucky with the direct fit, but the downside is a low-performance pump compared to the larger choices. However, it might be good enough to take me to 10psi if I ever want to try it.

Frank