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Mechanical pump w/ electric helper near the

Yeahrightgreer

Yeahrightgreer

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Finally starting the assembly on my 512” w/ a Proform 950 Carb and have yet to plan out a fuel system. Mostly looking for tips and advice. This is a full on street car which will see a lot of miles idling, cruising or street racing on a Saturday night.

I know there are some good reasons to just go to a fully electric system - but I like the idea of a high volume mechanical pump to live on the street; and a electric pump on a switch that I won’t have to constantly listen to. Additionally - I would like to take the car on long drives and not have to worry about being able to walk in any store and walk out with a pump.

I’d like to add nitrous soon and I’m just scared of the idea of running out of fuel while I’m under boost.

The carb needs 6.5 PSI so I’ve been Looking at running maybe a Holley or Carter HV 110 ghp mechanical pump which will give about a constant 7PSI and maybe a 2-4 PSI electric “helper” near the tank. Still need to pick a fuel line size but thinking about 3/8” or 1/2”. I hate using HP numbers but aiming for approximately 650 ballpark revving up to 6,500

I know some guys run one on a stocker motor but has Anyone else run a helper on a HP/racing application?
Would I need to regulate the additional 2-4 PSI? Or will the mechanical pump internally regulate it?
 
Last edited:
2-4 psi before the mechanical no regulator needed.
I like the Carter pump you list.I have that on my 65
I actually run the Carter street electric pump(4-6 psi)on my 65 as a booster to the mechanical on a switch.
Been on the car 16 years now.
It's a 472 Hemi with a cross ram no problem getting fuel to the carbs.It has a 3/8'' fuel line.
Ran the same setup when it was a 451 stroker when it was a drag car.Worked very well.
Your guess 650 Hp you should be ok for street/strip. Nitrous I know nothing about so I'm no help there,sorry.
 
I have 2 Carters on my car, the electric does nothing to add pressure, it stays about 7-7.5, I did have 2 bad M6903 pumps in a row though, 3rd one was the charm, works great now.
 
65Fury440 said:
I have 2 Carters on my car, the electric does nothing to add pressure, it stays about 7-7.5, I did have 2 bad M6903 pumps in a row though, 3rd one was the charm, works great now.
Click to expand...

Is your electric one on a switch? Also is it a flow through style that allows fluid through even when the motor isn’t powered?
 
I would use a good mechanical and a small charge pump near the tank on a momentary switch just to charge the system for cold starts. (you know how street gas likes to evaporate) Always check the running pressure at the carb and regulate accordingly. No more than 5# is my guideline.
 
I used to use a Carter electric pump in just that set up, and yes the fuel will flow through with the electric pump off. I'm not sure about other types of pumps.
 
Carter Electric street pump. Flows thru mine no problem.
 
Yeahrightgreer said:
Is your electric one on a switch? Also is it a flow through style that allows fluid through even when the motor isn’t powered?
Click to expand...

I use one of these guys out back.
https://www.amazon.com/Carter-P4600...GPZQQMWH3RW&psc=1&refRID=2ESKWAS3QGPZQQMWH3RW

Yes it is on a switch. I always run it and get some pressure before cranking cold, works like a charm.
I turn it off after the engine fires, and only use it when racing.
Even shifting the 520 @ 7k, the 3/8 line feeds the Dominator fine.
I need to put a cell in eventually, at that point might scrap the whole thing and go to an in the tank pump with return.
Doing things twice seems to be the norm with an ever evolving project.
 
Plumb a by-pass line around your electric pump. Install a check valve in the by-pass line so that the flow direction is from the tank to the mechanical pump (the check valve will shut when the electric pump is running). This will allow unrestricted flow to the mechanical pump with electric not running but boosted volume when the electric is needed. Been doing this for years with the Carter pumps. I even installed the same by-pass around the Carter lift pump on my '02 2500 Cummins. If the lift pump failed, it wasn't an automatic death sentence to the Bosch VP44 injector pump.
 
This is a fine little pump for carb engines. Use it as a prime pump or as a supply pump. I's lower pressure and the mechanical pump will pull fuel through it easily. Make sure you use a pressure regulator set at 5# or less. https://www.summitracing.com/parts/atx-e8012s
 
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