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I heard Fram filters cause a big restriction??


IMO Fram fuel filters are junk.



Point of reference. My Mallory 140 sucked 1 gallon in 25 seconds through my OLD Fram and 1/2" lines. That's free-flow to the regulator. I changed to a stated 500gpm stainless mesh canister filter and it flowed exactly the same.
It ran [Email]10.39@128[/Email] on E53 last night but was a little rich on that run with 94/95 jets.



THE CORRECT way to plumb a high perf fuel system-any HP fuel system is to use a 100 micron filter before the pump and a 10 micron after. You also need at least a number 10(12 is better for some bigger pumps) or two number 8's y'd on the inbound into the 100 micron filter then outbound to the pump. Anything other than this may well cause the pump to cavitate and by your description that exactly what your's is doing. If you plumb your present pump correctly it probably will do the job.





Inlet plumbing always needs to be bigger(2 sizes) on all fluid pumping systems. Gas pumps need to be gravity fed because gasoline cavitates real easy.