do i need a bigger fuel pump ?

jim kinney

Registered User
I have a 89 aod sc with k&n panel filter, removed airbox, aod been rebuilt with shift kit, magnum powers raised top, 3 in. Y pipe, no resanator , two turbo mufflers, coustom down tubes, high flow cats, 180 thermastat, high speed fan on with key mod, and 10% pulley yet to be installed. My question is when the car shifts from 2nd to 3rd gear there is a little spark knock like maybe its running lean. I replaced spark plugs, wires, fuel filter all with motorcraft parts. Is my stock fuel pump up for the task? This car really runs well other than the above problem.
 
Jim, especially once you get that 10% pulley on there, I think you'll be getting to the edge of what the stock pump can provide, unless you go with an adjustable fuel pressure regulator, and boost that up a few pounds. But there are pros and cons to using an AFPR, search the threads for some past discussions on that topic.


cheers
Ed Nicholson
SCCoO
 
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