Tommy V
Well-Known Member
- Joined
- Jul 24, 2014
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- Brookly park Md
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- Tommy
- Vehicle(s)
- 2015 race red gt pp manual, recaros, 401al DOA "too much boost on 93", 2017 GT Auto
I'm not sure about fuel but I though whenever u increased the size of the feed or return line the cfm would increase but the pressure would drop,I know it's like that with hydraulics and other systems.Im just asking because this is something I want to know also before I do mine.no, larger lines create less friction, less friction = less pressure drop acrcoss the an identical lenght of hose(6an vs 8an). The flow gains would be minimal, on a high pressure EFI system, pressure drop across hose is a lot smaller than it is on a low pressure carb set up. So IF you are only be seeing a 3psi drop on 6AN that is maybe 1.5-2psi on 8AN, you would then need to refer to the pumps flow chart and see how much more flow the 1-1.5psi you just saved will give you. Chances are it's a negligible amount.
best way to know is to measure fuel psi at the pump outlet and then at the rails
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