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Old 05-09-2010, 09:31 PM   #1
Louie
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Default Mechanical Fuel Pumps ( How much is TOO Much?)

Bulding a 400" SBF/ Yates / PT 106mm / EFI combo.
Not sure on fuel yet as the Leaded Ban is still in effect here in Canada.
I have been looking at using an Enderle Mechanical Pump (Belt Driven ). Reason being if I cannot use C16 why buy a pump now ( Areomotive ) and then have to buy another to handle methenol.
I am considering the Enderle 1200 FUEL PUMP 18.8gpm pump
Just because I can make the switch later if I have too.
Is this Too much pump? Can it be regulated by the pulley sizes I use?

Thanks
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Old 05-10-2010, 09:18 AM   #2
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

Anyone use mechanical Enderle pumps?
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Old 05-10-2010, 09:22 AM   #3
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

Since you are going EFI I assume you will have a regulator inline... So I don't think you can have TOO much pump, I don't think you can regulate volume my pulley size, however pressure and how quick you get pressure.
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Old 05-10-2010, 09:41 AM   #4
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

pump loop
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Old 05-10-2010, 09:59 AM   #5
Jim Wiens
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

If your running methanol that would be the smallest pump i would run if you can swing it get a waterman pump they are a lot better and you can change the the gears to get what ever flow you need i have a 19.8 on a 400 ci sbc
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Old 05-10-2010, 05:38 PM   #6
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

Thanks Gentlemen!
Louie
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Old 05-10-2010, 06:16 PM   #7
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Default Re: Mechanical Fuel Pumps ( How much is TOO Much?)

With EFI you want to be able to bypass nearly all of the fuel that the pump can produce. The reason for this is the EFI has the ability to turn the injectors completely off, whereas mechanical injection nozzles do not shut off.

What you have to watch out for with a large mechanical pump and EFI is the deceleration fuel cut.

This is noticed when you let off of the throttle after a pass, the engine is at high RPM and the injectors close (standard EFI tuning - for engine braking/clean plugs).

If your regulator set-up cannot bypass all of the pumps fuel, you can get an extreme pressure spike causing the injector o-rings to be blown out and a possible fire.

You can either:
Ensure the regulator or regulators can bypass enough fuel,
And/Or
Run a high speed bypass set at ~20 psi higher pressure than you will ever run (remember to factor base pressure + boost pressure).

You can test for this by revving the engine off of idle, while watching your fuel pressure gauge or sensor. If the pressure does not immediately return to base pressure, you need to bypass more fuel.
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