Yesterday while draining my fuel tanks after the Tom Papp run I decided to re-check the flow of the fuel pumps.
The fuel system on the CP looks like this:
It runs two of these 150 GPH Holley pumps # 510-12-150 (jegs part#) $210.00:
The system has a three-way switch that can run left,right or both pumps. Some years back I modified the fuel tanks with 1/2" pick-up tubes. I had these J- tubes built and I drilled the fuel tanks and installed them:
The system pulls out of the stock pick-up and the new J tube.
The pumps are rated at 150 GPH so yesterday I re-checked the flow. Both pumps , one at a time, moved 2 gallons of fuel in 50 seconds and when both pumps were working together they pumped 2 gallons in 31 seconds.
Our system has a high flow regulator that has zero ( 0 ) flow restriction:
So with the measured fuel flow the Holley 150 pump moved 144 gallons per hour individually and 232 gallons working together. The 144 gallons per hour is enough fuel to feed 1,728 hp (144 gallons x 6lbs per gallon = 864 lbs / .5 (BSFC of 1/2 lbs fuel per hour per hp) and the two pumps working together move enough fuel (at 1,393 lbs per hr) to produce 2,787 hp at a BSFC of .5.
The 565 has a BSFC of less than .40 so on one pump at 864 lbs per hr an engine with a BSFC of .375 could make 2,304 hp.
The Holley 150 pumps cost about $ 220.00 from Summit and Jegs and ours run for hrs and hrs. So if someone is considering a fuel system up-grade this Winter they are very good pumps ( bang of the buck wise). But if you have stock pick-ups in your tanks you should replace them with larger pick-ups.
In any case you can up-grade your fuel system without spending a small fortune and use the money saved for something else on your boat. We never had the money to over spend on things so we found alternative ways to do somethings.
Hope this helps a few people.
Edit: I guess I should add that if someone has an old Holley Blue that is rated at 110 gph and you re-place the small pick-up tubes and run 1/2" or -8 fuel lines with a high flow regulator you can feed over 750 hp with that small pump.
One thing about a boats fuel system is that you don't have to push the fuel 12-16' like you do in a car. The lack of friction loss in the shorter fuel lines really helps a boat get away with a smaller pump.
Big Inch Ford Lover
aka. Mr. Pres