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Fuel Pump, electric vs. mechanical #153657
11/19/08 10:13 PM
11/19/08 10:13 PM
Joined: Feb 2007
Posts: 169
Maine
itali83 Offline OP
member
itali83  Offline OP
member

Joined: Feb 2007
Posts: 169
Maine
I was wondering what you guys think is the best simplest, cheapest, reliable way of doing a fuel system for my 68 roadrunner, with a .040" 440, mild hydraulic cammed, aluminum headed dual plane intaked motor would be. I always had electric in my mind but now am wondering if it's needed. This will be a street strip car, not sure if I'm going to run a fuel cell or not. I'm needing to watch my spending a little more now (building a house, just married etc etc) I just want to make sure my motor has the fuel it needs, doesn't vapor lock or have any glitches if it can be helped. Let me know what you guys run for a fuel system and how you do it. Thanks in advance!


'68 Roadrunner Built 440/727 4:10 filled 8 3/4 in the process of a ground up restification
Re: Fuel Pump, electric vs. mechanical [Re: itali83] #153658
11/19/08 10:14 PM
11/19/08 10:14 PM

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mild cam- go with a mechanical carter. 6 psi street pump

Re: Fuel Pump, electric vs. mechanical [Re: itali83] #153659
11/19/08 10:52 PM
11/19/08 10:52 PM
Joined: Aug 2005
Posts: 11,543
chicagoland,usa
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buildanother Offline
I Live Here
buildanother  Offline
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Posts: 11,543
chicagoland,usa
Have not had luck with mech pumps around here for years, summer months trips to dragstrip had car falling on it's face at end of track, changed to elec pumps and have not gone back. BUT, the use of a return line does help in many cases.

Re: Fuel Pump, electric vs. mechanical [Re: buildanother] #153660
11/20/08 12:16 AM
11/20/08 12:16 AM
Joined: Jun 2004
Posts: 3,319
Chicago Burbs
sthemi Offline
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sthemi  Offline
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Chicago Burbs
I've been using a Mallory electric feeding into a stock Mechanical for 10 years, it helps with extended storage dry start problems and helps with fuel vapor lock.
An an added bonus is if either fails, you still get home..

Re: Fuel Pump, electric vs. mechanical [Re: sthemi] #153661
11/20/08 12:35 AM
11/20/08 12:35 AM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
5.7L Hemi, 6spd
GoodysGotaCuda  Offline
5.7L Hemi, 6spd

Joined: Nov 2004
Posts: 25,050
Texas
I prefer using my electric pump.

I wish I had added in a return line to the system so it'd help with noise and keeping the fuel cooler (not having issues with vaporlocking however). I like the fact that if I run it out of fuel, I don't have to crank it up for 20seconds to fill the carb up. Also, if I know I will be working on the carb, I can cut the fuel and run the level down without making much of a mess. Fuel pressure and volume is consistent....No complaints other than the non-return system, and going with a cheap/loud Holley blue pump.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
[img]https://i.imgur.com/v9yezP9.jpg[/img]
Re: Fuel Pump, electric vs. mechanical [Re: GoodysGotaCuda] #153662
11/20/08 04:22 AM
11/20/08 04:22 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
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383man Offline
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Posts: 27,421
Balt. Md
You cant beat the simple system I run. I use my stock fuel tank with a 3/8 sending unit and I bent 3/8 fuel line and installed the line in the stock posistion. I use the Holley red pump and mounted it in front of the tank. At the carb I use some braided line with a fuel filter in the line. And I have changed the filter to a steel one. No fuel pressure regulator to mount as the red pump is set to 7 psi with built in regulation. I just wanted a simple fuel system close to stock but with 3/8 line and an electric pump. It's so simple for a fuel system that feeds my mid 11 second mild 440 with fuel to spare. As for electric fuel pump noise..............If I was worried about that I would be driving a granny's slant six car without 3" exh and Ultra-Flow muffler's. Ron


Last edited by 383man; 11/20/08 04:23 AM.
Re: Fuel Pump, electric vs. mechanical #153663
11/20/08 09:54 AM
11/20/08 09:54 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

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Posts: 24,562
Brookeville, Md
Quote:

mild cam- go with a mechanical carter. 6 psi street pump



no need for an electric

Re: Fuel Pump, electric vs. mechanical [Re: Mr.Yuck] #153664
11/20/08 09:58 AM
11/20/08 09:58 AM
Joined: Jan 2007
Posts: 1,163
NORTHERN VA
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THESHAKERPROJECT Offline
super stock
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super stock
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NORTHERN VA
I have run well into the 12s with a stock pump and yes the noise of an elec pump drives me nuts.

Re: Fuel Pump, electric vs. mechanical [Re: Mr.Yuck] #153665
11/20/08 09:59 AM
11/20/08 09:59 AM

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use both....The electric will pressurize the line so that if the mechanical fails on HIGH revs, The electric will still send the fuel .

Re: Fuel Pump, electric vs. mechanical [Re: itali83] #153666
11/20/08 10:07 AM
11/20/08 10:07 AM
Joined: Jul 2007
Posts: 531
Virginia
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JimG Offline
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Posts: 531
Virginia
If you run an electric pump and a mechanical pump - in some cases (possibly all?) if the diaphragm ruptures in the mechanical pump, the electric pump can fill your crankcase with gasoline.

Just something to consider.

Re: Fuel Pump, electric vs. mechanical [Re: JimG] #153667
11/20/08 10:29 AM
11/20/08 10:29 AM
Joined: Mar 2007
Posts: 3,285
West Coast, USA
jbc426 Offline
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West Coast, USA
Quote:

If you run an electric pump and a mechanical pump - in some cases (possibly all?) if the diaphragm ruptures in the mechanical pump, the electric pump can fill your crankcase with gasoline.

Just something to consider.




Ouch! that blows....literally. What ever you decide to run. Do yourself a favor and install a return line so you can have a bleed off back to the tank. It helps keep your fuel cooler and fights vapor lock. (NOTE: This is a simple bleed-off set-up for a dead-head system that is similar, but different than race style Return-Line-System)

It's super easy to do, and the only issue is that you need to check if you already have a return line equipted sending unit(if not modify yours or install a new one), install some flexible aluminum tubing to run from the front to the back of the car, and run a 3-nipple, metal fuel filter installed close to the carb and down stream from the regulator (available at any auto parts store- the 3rd nipple is already metered for the return)

Use high quality Fuel Injection hose and clamps at a minimum. High quality braided steel lines are required to pass tech at your local track.


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
Re: Fuel Pump, electric vs. mechanical [Re: JimG] #153668
11/20/08 10:39 AM
11/20/08 10:39 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Quote:

If you run an electric pump and a mechanical pump - in some cases (possibly all?) if the diaphragm ruptures in the mechanical pump, the electric pump can fill your crankcase with gasoline.

Just something to consider.



I ran both on my Supercharged 440, although I only used the electric at the track or if I was "gettin' it"

Re: Fuel Pump, electric vs. mechanical [Re: Mr.Yuck] #153669
11/20/08 11:10 AM
11/20/08 11:10 AM
Joined: Jul 2007
Posts: 531
Virginia
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JimG Offline
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Virginia
Quote:


I ran both on my Supercharged 440, although I only used the electric at the track or if I was "gettin' it"




Swingin 72:

I always guessed that a mechanical pump wouldn't do a good job of sucking through a static electric pump. You learn something new every day!

Jim

Re: Fuel Pump, electric vs. mechanical [Re: JimG] #153670
11/20/08 11:15 AM
11/20/08 11:15 AM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
I would have never thought it would work either. The guy I got all my S/C stuff from recommended it. Again I only used the electric for 10-15 seconds at a time. I would never use both together all the time.

Re: Fuel Pump, electric vs. mechanical [Re: Mr.Yuck] #153671
11/20/08 12:13 PM
11/20/08 12:13 PM

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All your doing by using both is pressurizing the line When the car is running, I have used both for 15+ years in my 1968 RAII Firebird and I will say NO problems ever....I have had several times that the mechanical pump could not keep up with the high revs that the car would put out since the installation of both the car has never failed.







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