John Wood Nut Swinger
Join Date: Jan 2007
Location: too far from Texas
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If there is any concern about the fuel supply, put in a fuel pressure gauge. That will tell you if the stock pump is keeping up. Then you can see what pressure you are at and shim the FPR.
I would do at least the the pre-pump mods and possibly a regulated return if funds allow. Then if you still need a pump I would go with either a walbro or Bosch pump. They will fit in the stock location and wiring. The walbro flows 48gph and the bosch flows 55gph. Stock flows 32gph.
To determine the GPH needed use this calculation: By my calculations your 140cc injectors(stock injectors) would be 23 GPH at 2600 RPM. After 2600rpm the fuel delivery decreases so the maximum amount of fuel that can be injected is at 2600rpm.
140cc/1000 (cycles to get the fuel quantity) =.14cc per injection event
2600 RPM / 2 = 1300 injection events per injector X 60 minutes per hour = 78,000 injection events per injector per hour
.14cc X 8 injectors X 78,000 = 87,360cc per hour
3,785cc's = 1 gallon
112,320 / 3,785 = 23.08 GPH
(Born on 11-20-98) F350 CC LWB 4X4
north of 480hp and south of 13.7sec
Bored with current setup
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