The reason I'm asking guys....is because I'm looking into a kit the Lightning guys use. It's called a 2 pump trick. It works off a Hobbs switch that activates under boost and energizes the 2nd tank. So I would have both pumps pushing fuel at the same time.
It's a pretty wild setup.....and I need all the fuel I can get for my 408w and 6psi blower.
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It would depend on the size of your injectors and the fuel pressure you are running.
If you have stock injectors and fuel pressure regulator then one pump is all you need.
The in-tank 1990+ pumps put out about 100 PSI against a blocked head.
They are rated at 125 LPH (33 GPH) @ 310 KPA (45 PSI) so the stock pumps can put out more than enough fuel for the 460.
A 460, 351 & 302 have a top fuel pressure of 45 PSI (310 KPA) and a 300 engine 60 PSI (415 KPA) so there is no problem. If you want more than you would have to go with an adjustable fuel pressure regulator.
The Injectors Flow #/HR are for the 300 = 14#/HR, 302 & 351 = 19#HR and the 460 at 24#HR.
So the injectors @42 PSI for the 14#HR = 2.45 GPH, 19#HR = 3.3 GPH & 24#HR = 4.2 GPH.
So a 460 at WOT = 33.6 GPH @ 42 PSI. and that would be enough fuel with a 33 GPH @ 45 PSI as the pump would put out more GPH at 42 PSI.
Any engine under the 460 would have more than enough fuel.
Two things to consider in your sizing:
1) Boosted engines are a bit less efficient in their use of fuel. Use a BSFC of 0.55 lbs/HP-hr.
2) In order to maintain the same pressure drop across the injectors, your Fuel Metering Unit is going to raise the backpressure against which the pump(s) must flow. Typically gerotor pumps with low viscosity fluids like gasoline lose a fair amount of flow as pressure increases. IIRC there are flow/pressure curves for all the various Walbro pumps on the net. Time for a search.
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