mechanical or electric fuel pump?????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

yenko427 · 07-30-2007, 10:57 PM

My fuel pump decided to go out yesterday and I'm still working on all the wiring and inside the dash. The guy that I bought the truck from has only put about 3 hour on the engine. The problem that I'am having is should I go back with a mechanical pump or step to an electric. I have a holley 750 double pumper with a air gap intake. Give me you ideas please!

**truckdude239** · 07-30-2007, 11:02 PM

mechanical wont have no problems out of it

**SactoJim** · 07-30-2007, 11:09 PM

Hard to beat a good ole mechanical pump and they don't fail too often.....got one feeding my 500+ hp 383.

If ya get an electrical one, spend the money and buy a good one. Another nice thing about an electric pump is you can wire a switch to it and hide it......nice theft deterrent.

GREASEMONKEY72 · 07-30-2007, 11:14 PM

i agree with what SactoJim said

WinDancer · 07-30-2007, 11:25 PM

I am doing everything I can electric trying to steal back all the horses I can. Just my .02.

68gmsee · 07-30-2007, 11:26 PM

I'll go with mechanical also... less than 20 dollars vs a bunch of money....

see ten · 07-31-2007, 05:27 PM

My brother in laws Z that I am storing has an electric pump. I really don't care for it. It's very loud even with it being mounted under the back of the car. When you're sitting at a stop light with your blinker on you can hear the engine idling up and down with the electrical load of the blinkers. It will be getting a mechanical pump again soon.

Jim_PA · 07-31-2007, 11:09 PM

I went electric once ( a red holley to be precise...) and I couldn't get the mechanical one back on there quick enough. Big time PITA, not to mention the noise gets a little irritating.

72 68 andmore · 07-31-2007, 11:42 PM

if you go electric you have to put a regulator on it and it think it is 5 to8 PSI but don't quote those numbers. I have seen regulators cheap on ebay

*Billla* · 08-01-2007, 12:22 AM

Mechanical for anything street-driven.

Longhorn Man · 08-01-2007, 06:29 PM

I have yet to hear a good reason to go with an electric pump.

GREASEMONKEY72 · 08-01-2007, 06:38 PM

Quote:

Originally Posted by Longhorn Man

I have yet to hear a good reason to go with an electric pump.

the only one ive heard is to free up HP but its such a small amount its pointless

Longhorn Man · 08-01-2007, 06:50 PM

if you can feel a 1/2 a horse from the drivers seat, you need to hire yer hide out to NASA.
Just my opinion, but I'll bet a kick in the daddy parts that you'd never feel the loss in power, nor would you see it in MPH or ET on a drag strip.
And remember, the power to run the electric pump comes from somewhere... it takes power to run the alt, and the more load you are putting on it, the more power it takes to turn it. Ever notice the wife's honda bog down when the electric fan kicks on at the stop light?

BP68 · 08-01-2007, 06:52 PM

Mechanical would be a simple swap out. And some times it is good to Keep It Simple.

I was gonna go mechanical, but my engine was a replacement TBI crate motor that came out of a wrecked Suburban. I pulled the block off plate to install the mechnical pump, and found that the block was not machined all the way into the crankcase for the push rod.

So I ended up with a Jeg's inline electric pump setup for a carb. If I ever convert to fuel injection, I guess this will give me a head start on the plumbing.

GREASEMONKEY72 · 08-01-2007, 07:06 PM

Quote:

Originally Posted by Longhorn Man

if you can feel a 1/2 a horse from the drivers seat, you need to hire yer hide out to NASA.
Just my opinion, but I'll bet a kick in the daddy parts that you'd never feel the loss in power, nor would you see it in MPH or ET on a drag strip.
And remember, the power to run the electric pump comes from somewhere... it takes power to run the alt, and the more load you are putting on it, the more power it takes to turn it. Ever notice the wife's honda bog down when the electric fan kicks on at the stop light?

*jojotonka* · 08-01-2007, 07:35 PM

Just my .02..
I have a Holley Blue and LOVE IT!!!!!!!!! I put a 454 in my Jimmy and the mechanical pump was too close to the frame rail. I have only put about 2,000 miles on this set-up but it has performed flawless. I also have upgraded to a one wire alternator, so there is no fluctuation in voltage. I can hear the hmmm of the pump, but hard to notice over loud pipes and 37" swampers.

*Billla* · 08-01-2007, 08:02 PM

Quote:

Originally Posted by Longhorn Man

I have yet to hear a good reason to go with an electric pump.

Fuel injection

Agree, though - unless you're in the very rarified air where 110 GPH won't feed the beast I can't think of any reason in the world.

Longhorn Man · 08-01-2007, 08:23 PM

Bill, you are right, i shoulda said carb aplication.
BP68 has a good reason too, his block wasn't made for it.

07-30-2007, 10:57 PM	#1
yenko427 Registered User Join Date: Jun 2007 Location: Sweeny,Texas Posts: 96	mechanical or electric fuel pump?????? My fuel pump decided to go out yesterday and I'm still working on all the wiring and inside the dash. The guy that I bought the truck from has only put about 3 hour on the engine. The problem that I'am having is should I go back with a mechanical pump or step to an electric. I have a holley 750 double pumper with a air gap intake. Give me you ideas please!

07-30-2007, 11:02 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: mechanical or electric fuel pump?????? mechanical wont have no problems out of it __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-30-2007, 11:09 PM	#3
SactoJim Registered User Join Date: Oct 2005 Location: Sacramento, CA Posts: 1,970	Re: mechanical or electric fuel pump?????? Hard to beat a good ole mechanical pump and they don't fail too often.....got one feeding my 500+ hp 383. If ya get an electrical one, spend the money and buy a good one. Another nice thing about an electric pump is you can wire a switch to it and hide it......nice theft deterrent. __________________ 72 Cheyenne SWB Fleet Nut & bolt frame off in progress...99.9999% - supercharged 383 - 4 wheel discs - relocated fuel tank - My Build Thread

07-30-2007, 11:14 PM	#4
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: mechanical or electric fuel pump?????? i agree with what SactoJim said __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

07-30-2007, 11:25 PM	#5
WinDancer The Original HotRod KnifeMaker Join Date: Jan 2007 Location: Tenino, Washington Posts: 811	Re: mechanical or electric fuel pump?????? I am doing everything I can electric trying to steal back all the horses I can. Just my .02. __________________ Dave 69 GMC SWB 2WD 454 Turbo 400

07-30-2007, 11:26 PM	#6
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: mechanical or electric fuel pump?????? I'll go with mechanical also... less than 20 dollars vs a bunch of money....

07-31-2007, 05:27 PM	#7
see ten WTB this ad Join Date: Sep 2004 Location: Lafayette Georgia Posts: 5,074	Re: mechanical or electric fuel pump?????? My brother in laws Z that I am storing has an electric pump. I really don't care for it. It's very loud even with it being mounted under the back of the car. When you're sitting at a stop light with your blinker on you can hear the engine idling up and down with the electrical load of the blinkers. It will be getting a mechanical pump again soon.

07-31-2007, 11:09 PM	#8
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: mechanical or electric fuel pump?????? I went electric once ( a red holley to be precise...) and I couldn't get the mechanical one back on there quick enough. Big time PITA, not to mention the noise gets a little irritating.

07-31-2007, 11:42 PM	#9
72 68 andmore Registered User Join Date: Sep 2006 Location: Canada Posts: 54	Re: mechanical or electric fuel pump?????? if you go electric you have to put a regulator on it and it think it is 5 to8 PSI but don't quote those numbers. I have seen regulators cheap on ebay

08-01-2007, 12:22 AM	#10
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,814	Re: mechanical or electric fuel pump?????? Mechanical for anything street-driven.

08-01-2007, 06:29 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: mechanical or electric fuel pump?????? I have yet to hear a good reason to go with an electric pump.

08-01-2007, 06:50 PM	#13
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: mechanical or electric fuel pump?????? if you can feel a 1/2 a horse from the drivers seat, you need to hire yer hide out to NASA. Just my opinion, but I'll bet a kick in the daddy parts that you'd never feel the loss in power, nor would you see it in MPH or ET on a drag strip. And remember, the power to run the electric pump comes from somewhere... it takes power to run the alt, and the more load you are putting on it, the more power it takes to turn it. Ever notice the wife's honda bog down when the electric fan kicks on at the stop light?

08-01-2007, 06:52 PM	#14
BP68 Registered User Join Date: Jun 2006 Location: Olive Branch, MS Posts: 824	Re: mechanical or electric fuel pump?????? Mechanical would be a simple swap out. And some times it is good to Keep It Simple. I was gonna go mechanical, but my engine was a replacement TBI crate motor that came out of a wrecked Suburban. I pulled the block off plate to install the mechnical pump, and found that the block was not machined all the way into the crankcase for the push rod. So I ended up with a Jeg's inline electric pump setup for a carb. If I ever convert to fuel injection, I guess this will give me a head start on the plumbing. __________________ 68 C10 Shortbed Fleetside 06 Chevy Ext Cab Fleetside 03 Grand Prix GTP My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=269999

08-01-2007, 07:35 PM	#16
jojotonka Account Suspended Join Date: Jan 2007 Location: lennon, michigan Posts: 162	Re: mechanical or electric fuel pump?????? Just my .02.. I have a Holley Blue and LOVE IT!!!!!!!!! I put a 454 in my Jimmy and the mechanical pump was too close to the frame rail. I have only put about 2,000 miles on this set-up but it has performed flawless. I also have upgraded to a one wire alternator, so there is no fluctuation in voltage. I can hear the hmmm of the pump, but hard to notice over loud pipes and 37" swampers.

08-01-2007, 08:23 PM	#18
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: mechanical or electric fuel pump?????? Bill, you are right, i shoulda said carb aplication. BP68 has a good reason too, his block wasn't made for it.



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