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SN-95 and New Edge Mustangs
99 Cobra Eaton Swap
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<blockquote data-quote="01yellercobra" data-source="post: 16824603" data-attributes="member: 35549"><p>The returnless system constantly varies the fuel pressure depending on engine load. So when he says it was low, when was it low? At WOT? Yeah, 30psi would concern me. At idle? That's perfectly fine. Yes, the ECU does learn, but it still needs a base table to know where to start. </p><p></p><p>So you weren't there when he tuned it? Did you just drop it off then pick it up when it was done?</p><p></p><p>Unless you're looking to make 700hp on E85 I don't see the need for a full return style. If it were my car I'd start at the back and drop the tank to make sure the pump was installed correctly. I don't know anyone running a BBK pump so I can't comment on that. I do believe there's a 340lph pump out there that works in the stock basket. The Mach guys might know more about that. I never tried one as I went to dual pumps right off the bat. Maybe the new Hellcat pump will work? </p><p></p><p>FWIW, I've seen pumps that say they're made to work with returnless style systems then fry because they weren't actually designed for it. </p><p></p><p>Once you verify the pump I'd get some logs to see what's actually going on. Just watching the wideband will only tell you so much. But idling at 17 makes me think there's a large vacuum leak or a tune issue.</p></blockquote><p></p>
[QUOTE="01yellercobra, post: 16824603, member: 35549"] The returnless system constantly varies the fuel pressure depending on engine load. So when he says it was low, when was it low? At WOT? Yeah, 30psi would concern me. At idle? That's perfectly fine. Yes, the ECU does learn, but it still needs a base table to know where to start. So you weren't there when he tuned it? Did you just drop it off then pick it up when it was done? Unless you're looking to make 700hp on E85 I don't see the need for a full return style. If it were my car I'd start at the back and drop the tank to make sure the pump was installed correctly. I don't know anyone running a BBK pump so I can't comment on that. I do believe there's a 340lph pump out there that works in the stock basket. The Mach guys might know more about that. I never tried one as I went to dual pumps right off the bat. Maybe the new Hellcat pump will work? FWIW, I've seen pumps that say they're made to work with returnless style systems then fry because they weren't actually designed for it. Once you verify the pump I'd get some logs to see what's actually going on. Just watching the wideband will only tell you so much. But idling at 17 makes me think there's a large vacuum leak or a tune issue. [/QUOTE]
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