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Old 03-21-2013, 09:43 AM
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Mechanical fuel pumps

Which fuel pump would be a better selection in street use of a 496 BBC:110gph or 170gph?

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Old 03-21-2013, 12:34 PM
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Originally Posted by MalibuMike View Post
Which fuel pump would be a better selection in street use of a 496 BBC:110gph or 170gph?
Unleaded automotive gasoline weighs about 6.25 pounds per gallon, so you need to decide if your engine can burn 680 or 1,060 pounds of gasoline in an hour.

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Old 03-21-2013, 09:56 PM
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In a perfect world you'd need to have just over 1/2 pound of gasoline per horsepower per hour. However, those flow numbers of the pumps are usually a free flow rating. Every bend in the lines, 45* fitting, ect will drop the flow also. The rating at a given pressure is much lower so for consistent jetting you need to maintain a consistent fuel pressure. So unless you know the flow rating at say 7 psi or what ever fuel pressure you run. Unless you know this I assume the pump will flow 1/2 of it's rating. So, Do you have a 650 hp motor or do you have more hp?
Using half the free flow rating might be overkill, but it's better to have more fllow than not enough
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Old 03-21-2013, 10:50 PM
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get the bigger one / run a regulator and a return line..
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