Fuel Pump Electric vs Mechanical - Team Camaro Tech
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post #1 of 13 (permalink) Old Jan 17th, 10, 08:28 AM Thread Starter
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Matt
 
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Fuel Pump Electric vs Mechanical

My engine is a 350 bored and stroked to a 383. It has a Holley 670 street avenger carb. Right now I have a good opportunity to replace my mechanical pump to an electric pump.

What are the pros and cons of both and what brand/model should I go with?

The fuel pump thatís on it now has had some problems so it will be getting replaced anyway.

Thanks in advance!

Matt
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post #2 of 13 (permalink) Old Jan 17th, 10, 08:46 AM
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Re: Fuel Pump Electric vs Mechanical

I have and like Aeromotive.

No real problems going to electric,run a relay,wire,I recommend an on/off switch too. Electric pumps like to push rather than pull and need to be fed from a line low on the tank.

I have my on/off switch hidden but easy to get to and wired into the ignition so when I turn the key it comes on. Now if I'm away from my car or have a fuel leak I just flip the switch off

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post #3 of 13 (permalink) Old Jan 17th, 10, 09:29 AM Thread Starter
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Re: Fuel Pump Electric vs Mechanical

Thanks Doug! The on/off switch is interesting and a good idea.

If teh electric pump is rinning and the engine is not, will that flood the engine?
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post #4 of 13 (permalink) Old Jan 17th, 10, 08:25 PM
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Re: Fuel Pump Electric vs Mechanical

As long as it is regulated down to under 8-9# at the carb you should not have a problem. Most I know run with 6-7# with a Holley carb at WOT, I think Edlebrock carbs might be 5.5# max.

Tom


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post #5 of 13 (permalink) Old Jan 18th, 10, 03:41 AM
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Re: Fuel Pump Electric vs Mechanical

Mine doesn't... but why run the pump with the car off unless for testing ?

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post #6 of 13 (permalink) Old Jan 18th, 10, 04:33 AM
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Re: Fuel Pump Electric vs Mechanical

Cheaper to run a man. Fuel pump..what kind of driving are you going to be doing with the car?

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post #7 of 13 (permalink) Old Jan 18th, 10, 09:22 AM Thread Starter
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Re: Fuel Pump Electric vs Mechanical

Doug- I normally wouldnt run the pump with the engine off except for testing. Just wondering since my wife may drive it some, I want to make sure I know all teh ins and outs of having an electric pump. I was thinking if key was on for the radio or something like that.

I will be driving it mostly around town with an occasional trip to the track (drag/road course) just for fun and to see what it will do. Mostly just average driving/cruising.
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post #8 of 13 (permalink) Old Jan 18th, 10, 09:26 AM
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Re: Fuel Pump Electric vs Mechanical

A mechanical pump will be cheaper ,simpler, and quieter and supply you with all the fuel youll ever need in that application.

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post #9 of 13 (permalink) Old Jan 18th, 10, 10:50 AM
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Re: Fuel Pump Electric vs Mechanical

Quote:
Originally Posted by vonzipper396 View Post
A mechanical pump will be cheaper ,simpler, and quieter and supply you with all the fuel youll ever need in that application.
X's 2. My Holley mech pump and stock 3/8 fuel line is more than adequate and supports my engine fine. See sig line.

Why add more stuff when it's not need/cost when its not needed?
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post #10 of 13 (permalink) Old Jan 18th, 10, 12:38 PM
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Re: Fuel Pump Electric vs Mechanical

If your engine is naturally aspirated and would be supported sufficiently by a mech. pump then I personally prefer that route. Less to go wrong with the mech. pump. Also - biggest reason is I can't stand the noise/buzz of the elec. pump.
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post #11 of 13 (permalink) Old Jan 18th, 10, 04:51 PM
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Re: Fuel Pump Electric vs Mechanical

[QUOTE=68RS-SS;1363259]If your engine is naturally aspirated and would be supported sufficiently by a mech. pump then I personally prefer that route.

x2^.The mechanical is far more reliable than an electric motor that can short out with no warning signs prior to failure.

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post #12 of 13 (permalink) Old Jan 18th, 10, 06:12 PM
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Re: Fuel Pump Electric vs Mechanical

Shameless plug.....

I've got a good one that is supposed to be able to support up to 500hp with all the fixin's in the classifieds right now.

https://www.camaros.net/forums/showthread.php?t=171824

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Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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post #13 of 13 (permalink) Old Jan 19th, 10, 08:31 AM
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Re: Fuel Pump Electric vs Mechanical

while I too prefer a mechanical pump my late model block was not drilled for the fuel pump shaft so I had to go electric.

Things I learned the hard way.

1. Install a fuel shut off valve before the fuel pump. Allows you to stop fuel from siphoning when you change/clean the filter. I also use as part of my theft deterrent as you can't get too far with just the fuel in the bowls and lines.
2. Install a good quality high volume/flow fuel filter right after the pump. I went with a Fram HPG1.
3. Install another fuel shut off in the engine compartment before the pressure regulator. This allows you to pull the carb and again not have fuel siphon everywhere.
4. Put a on/off switch in the 12v hot leading to the relay. This allows you to have the key "on" for other reasons without having the fuel pump running.

Russ (RJ)
The Garlic Capital, Gilroy,CA

(sold June 15,2014) 1968 RS convertible that is not quite stock

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