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Old 11-30-2003, 07:55 PM
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electric or mechanical fuel pump?

Hey guys i was wondering what type of fuel pump to go with? Ive got a chevy 383 stroker pushin about 628hp and close to 750ft lbs of torque....but i have a Weiand 6-71 supercharger and 2 demon 750cfm carburators(1500cfm total) on its way and i was wondering what type of fuel pump would be better for this application? a mechanical one or electric? with the supercharger im not sure how much more numbers are gonna be pushed out but im just concerned about the fuel pump. Any answers with brands and types would be helpful. Thanks!

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Old 11-30-2003, 08:36 PM
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I would say that an electric fuel pump is mandatory for your future installation.

Vince
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Old 11-30-2003, 08:39 PM
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Just don't get the Holley pumps or regulators. I have have nothing but troubles with them.
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Old 01-08-2004, 06:36 AM
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no kidding


I agree and think he is talking abuot the holley electric fuel pumps and regulators. I just swapped a 4-5 month old one ( holley blu) with a brand new one and its alreays making stupid noise, and possibly not working when cold.

Go electric, just dont go holley. get a race application.

sounds like a nice machine, ill take some pictures if you dont mind bragging.
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Old 01-08-2004, 12:09 PM
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I always run mechanical pumps. I hate being at the mercy of electric devices.

Any good 6 check valve mechanical pump is good to 1,200 HP.

My blown 540 big block Chevys at 1,100 HP run perfectly on a Clay Smith mechanical pump.

Plumb the fuel system correctly and never be stranded by an electric pump again.

Make sure you run a bypass regulator no matter what pump you end up with. They are not in the path of the fuel. Normal regulators are restrictive. All of them.

Clay Smith Cams in California.
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Old 01-08-2004, 12:26 PM
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I personally like electric pumps and have never ever been stranded. (I do have a spare just in case). I have seen mechanical pumps fail and they will leave you stranded just the same. It's a lot easier to replace an electric pump (IMO).

The Holley red and blue pumps are not the best and they are noisey. The cheap Holley regulators are not very good either. I do like my Holley Pro Series (Black) pump have been running it for about 5 years without a problem. I do use a Mallory bypass regulator though.

I just bought a BG pump for the car, to use when I drop in the blown engine.

Make SURE you have good filtration, this is what causes the most problem with electric pumps (dirt will cause problems). The filter MUST be between the tank/cell and the pump. You should also run a relay with an electric pump.

Mounting is also very critical, you want it as close as possible to the supply (tank or cell) and as low as possible.

Mechanical pumps are better at "pulling" fuel.

Electric pumps are better at "pushing" fuel.
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Old 01-08-2004, 01:01 PM
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ELECTRIC

I have built far too many 383s and TOTALLY agree with 302. Where you are going, ELECTRIC is the only way. Only problem I have ever had with the electric is bad gas. PUT A FILTER IN FRONT OF THAT THING. My El Camino used to eat the diaphragms out of the mechanical units. Believe that girls drive harder than boys. After my daughters third pump change, I changed to electric. No more problems. Just tickets.

hr41pearl
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Old 01-18-2004, 08:18 PM
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silverado 1987

is there and option of running a mechanical fuel pump on a block that has a fuel pump cast - but is blocked off?

do I just have it drilled? RXR
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Old 01-18-2004, 08:37 PM
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you'll get all sorts of answers ive always liked mechanical pumps so i would go with what infomaniac said.
but i have seen monsters with electric. either way
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Old 01-18-2004, 08:49 PM
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Cool

Anybody ever wonder how GM, Chrysler, and Ford somehow managed to feed their hi-po engines with mechanical pumps?

A 302 Z-28 winding up to 7,000 RPM was fed by a mechanical pump! Same with the LS-6 454! The 426 Hemi with dual four barrels no less! The Boss 429!

Keep it simple! A mechanical fuel pump will fill the needs of 90% of most rodders. 1BAD80 is pushing 650 horses running dual quads on a edelbrock crossram and he is running a holley mechanical pump. Less worries, less noise, and no need for an oil pressure cut-off switch in case of accident.
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Old 01-19-2004, 09:04 AM
Technical Support Barry Grant
 
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Mechanical vs. Electric

If the HP figure you gave is going to be with the Blower, and you're not going to be drag racing the car or launching it very hard a good mechanical pump should handle your needs. Both mechanical, and elctric pumps can and do break. There are pro's and con's to both setups.

Mechanical Pumps:
- No electrical draw
- Easier Plumbing

Electric Pumps
- Better Fuel control (for tuning)
- You know if the pump is on you have enough fuel

It's personal preference which way you want to go. On my Blower Motors I always run electric pumps so I can fine tune them better. Regardless of which way you go make sure to follow the manufactures recommendation on how to plumb it. Plumbing can be very critical to proper operation.
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