Fuel Pump GPM ?

# Thread: Fuel Pump GPM ?

1. ## Fuel Pump GPH ?

What is the correct way to calculate the proper GPH for a fuel system on a given motor? I have talked to some that say I need a monster pump and some say that I don't! I need the correct way! Thanks! WT

2.

3. Fuel piumps are rated in GPH not GPM. You need .5 lb per HP. Then you divide lbs required to get the GPH

HP X .5 / 6

500hp X .5=250/6= 41.67 GPH, or a minimum 50 GPH pump.

Keep in mind that alot of pumps(MOST!) are rated at zero psi free flow. You will need .5 lbs per HP at 5-6 psi. So the above example needs a 50 GPH pump @ 5-6 PSI

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4. GN GPH is what I messed up on! But that is exactly what I was looking for! Thanks!

Fix it!

5.

6. Originally Posted by gn7
Fuel piumps are rated in GPH not GPM. You need .5 lb per HP. Then you divide lbs required to get the GPH

HP X .5 / 6

500hp X .5=250/6= 41.67 GPH, or a minimum 50 GPH pump.

Keep in mind that alot of pumps(MOST!) are rated at zero psi free flow. You will need .5 lbs per HP at 5-6 psi. So the above example needs a 50 GPH pump @ 5-6 PSI

this is only good for NA and Gasoline. if you want to run a different fuel like E85 or planning for boost, numbers begin to change. but this is good info...most people never actually calculate for the fuel pump, they just buy whatever everyone else say they should.

Andrew

7. Originally Posted by ap67et10
this is only good for NA and Gasoline. if you want to run a different fuel like E85 or planning for boost, numbers begin to change. but this is good info...most people never actually calculate for the fuel pump, they just buy whatever everyone else say they should.

Andrew
This is correct! I have ran Holley Blue pumps for years with good success! Then I went to a mechanical pump and was just wanting to be sure!

8. Originally Posted by ap67et10
this is only good for NA and Gasoline. if you want to run a different fuel like E85 or planning for boost, numbers begin to change. but this is good info...most people never actually calculate for the fuel pump, they just buy whatever everyone else say they should.

Andrew
Yes this is ONLY for a N/A GAS deal and should be considered the minimum.

Holley is good enough to publish the flow volumes at free flow and actual real life running PSI. You can see there is a big difference. So be carefull when you pick you pump that it will flow the required amount at real life pressure.

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9. Originally Posted by Widetrack
This is correct! I have ran Holley Blue pumps for years with good success! Then I went to a mechanical pump and was just wanting to be sure!

what's the mechanical rated for GPH?

best to run over-size fuel lines to the pump and to the regulator with minimal tee's and 90*'s in the line.

S CP

10. ive read this seems to be good infohttp://aeromotiveinc.com/2010/01/fuel-pumps-and-horsepower/

11. Originally Posted by broncocarnage
ive read this seems to be good infohttp://aeromotiveinc.com/2010/01/fuel-pumps-and-horsepower/
First lesson of the week, how to link properly

LINK: Aeromotive Fuel pumps and horsepower

If you think figuring out a fuel pump size is a concern, imagine guesstimating the injector size of a 2200 HP roots deal, before it even hits the dyno. Now how much does that big azz piece of alum suck up again???

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