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Re: Mount electric fuel pump inline with mechanical pum
[Re: Blakcharger440]
#658313
04/01/10 05:38 PM
04/01/10 05:38 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I ran a Holley Blue near the tank with a toggle--had a Carter Mechanical up front on a 550 HP 451--ran on mechanical most times but it would lay over when I really got into it --so-flip on the electric when I was ready to make a pass or jump on a Ford at the light and bam! NO problems--actually picked my 1/4 mile time up a ton--I did have a Holley regulator near the carb--It works but you HAVE to have a vent on the tank or a small hole in the gas cap with the electric 
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Re: Mount electric fuel pump inline with mechanical pum
[Re: ]
#658314
04/01/10 06:59 PM
04/01/10 06:59 PM
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Joined: Jan 2003
Posts: 5,906
Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,906
Athens, Greece
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Don't they make 1 way valves for fuel? I have a 5/16" one way valve that a guy here was manufacturing. Its not on my car but I tested it and it works....He told me that it was a standard option valve on some Mercedes Benz in the 90s. Maybe look into that? I have no problem with drainback so I dunno what to tell you
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: Mount electric fuel pump inline with mechanical pum
[Re: Pyper70]
#658315
04/01/10 07:04 PM
04/01/10 07:04 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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You should run one or the other. Not both. You're hard start isnt drainback, it's the fuel evaporating faster tahn any fuel used to. So your carb goes dry and you need to turn the engine to fill the carb again. The mechanical isnt real good at suction. So it wont pull well thru the electric. The electric wont pump thru the mechanical very well. So, I'd say you can know ahead you have to turn it over for 10 seconds, then pump the gass twice and fire it... Or, remove the pump and install the Holley pump with a proper relay and wiring, and the regulator the blue pump needs, and just running that. Also, if it's noise you might be concerned about (the comment about not running it all the time) I would say use the Carter electric that requires no regulator and is about 1/2 the noise.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Mount electric fuel pump inline with mechanical pum
[Re: moper]
#658317
04/01/10 07:13 PM
04/01/10 07:13 PM
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Joined: Jan 2003
Posts: 1,795
Greer, SC
TooMany62s
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,795
Greer, SC
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Quote:
You should run one or the other. Not both. You're hard start isnt drainback, it's the fuel evaporating faster tahn any fuel used to. So your carb goes dry and you need to turn the engine to fill the carb again. The mechanical isnt real good at suction. So it wont pull well thru the electric. The electric wont pump thru the mechanical very well. So, I'd say you can know ahead you have to turn it over for 10 seconds, then pump the gass twice and fire it... Or, remove the pump and install the Holley pump with a proper relay and wiring, and the regulator the blue pump needs, and just running that. Also, if it's noise you might be concerned about (the comment about not running it all the time) I would say use the Carter electric that requires no regulator and is about 1/2 the noise.
Why not both? I've been running two for a couple of years. No problems.
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Re: Mount electric fuel pump inline with mechanical pum
[Re: Lee446]
#658319
04/01/10 07:43 PM
04/01/10 07:43 PM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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install the pump in paralell in the system. that way the mech pump doesnt work so hard tring to suck through the elec pump when its off..
I am truckless..
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Re: Mount electric fuel pump inline with mechanical pump?
[Re: Blakcharger440]
#658321
04/01/10 07:47 PM
04/01/10 07:47 PM
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Joined: Jan 2003
Posts: 25,842
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,842
Rio Linda, CA
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When installing one of the popular electric pumps you'll have to run it all the time because they won't allow the mechanical pump to pull through the electric.
To use the electric pump only for refilling the carbs you'll need an elaborate system of check valves or find a pump that allows pull-through. (piston aircraft have them)
The INTERNET, the MISinformation superhighway
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Re: Mount electric fuel pump inline with mechanical pump?
[Re: John_Kunkel]
#658322
04/01/10 07:51 PM
04/01/10 07:51 PM
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Joined: Jan 2003
Posts: 3,682
South San Francisco, Ca
70sixpkrt
master
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master
Joined: Jan 2003
Posts: 3,682
South San Francisco, Ca
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Quote:
When installing one of the popular electric pumps you'll have to run it all the time because they won't allow the mechanical pump to pull through the electric.
Hmm, I never thought of that. 
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Re: Mount electric fuel pump inline with mechanical pum
[Re: 340SHORTY]
#658323
04/01/10 07:55 PM
04/01/10 07:55 PM
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Joined: Nov 2006
Posts: 1,458
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,458
oklahoma
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Quote:
install the pump in paralell in the system. that way the mech pump doesnt work so hard tring to suck through the elec pump when its off..
Running them in parallel might be a good idea, but i ran mine in series and it worked fine. Had that setup for about 10 years in a car that was pretty much a daily driver. Decided i wanted to ditch my 5/16 line and go with 1/2, along with a fuel cell. Eliminated the stock pump and just ran the Holley electic. Found out that a Holley blue doesn't seem to last very long in constant useage.
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Re: Mount electric fuel pump inline with mechanical pump?
[Re: John_Kunkel]
#658324
04/01/10 08:01 PM
04/01/10 08:01 PM
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Joined: Nov 2006
Posts: 1,458
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,458
oklahoma
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Quote:
When installing one of the popular electric pumps you'll have to run it all the time because they won't allow the mechanical pump to pull through the electric.
To use the electric pump only for refilling the carbs you'll need an elaborate system of check valves or find a pump that allows pull-through. (piston aircraft have them)
I don't know what you mean by "popular electric pumps", but my stock pump pulled through my Holley blue just fine. And the Holley pushed through the mechanical pump with the engine off.
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Re: Mount electric fuel pump inline with mechanical pum
[Re: moper]
#658330
04/02/10 02:06 AM
04/02/10 02:06 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
You should run one or the other. Not both. You're hard start isnt drainback, it's the fuel evaporating faster tahn any fuel used to. So your carb goes dry and you need to turn the engine to fill the carb again. The mechanical isnt real good at suction. So it wont pull well thru the electric. The electric wont pump thru the mechanical very well. So, I'd say you can know ahead you have to turn it over for 10 seconds, then pump the gass twice and fire it... Or, remove the pump and install the Holley pump with a proper relay and wiring, and the regulator the blue pump needs, and just running that. Also, if it's noise you might be concerned about (the comment about not running it all the time) I would say use the Carter electric that requires no regulator and is about 1/2 the noise.
 Run a single decent electric pump and call it a day. OEM has been running electric pumps for 30 years. The dual system works, but seems like useless redundancy to me. I guess it's just because I always forsee the mech pump not being able to suck through the elec pump, or at a reduced fuel volume. Or the elec pump not being able to fully flow through the mech pump. But then my preferred setup is to run an electric pump with a return line and a return style regulator to ensure a constant, regulated and cool fuel flow.
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Re: Mount electric fuel pump inline with mechanical pum
[Re: DaytonaTurbo]
#658331
04/03/10 09:23 AM
04/03/10 09:23 AM
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Joined: Jul 2007
Posts: 531
Virginia
JimG
mopar
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mopar
Joined: Jul 2007
Posts: 531
Virginia
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Also consider the fact that if the mechanical pump's diaphragm ruptures, the electric pump can fill your crankcase with gasoline. Not good. Yeah, I know, there are people who've run this setup for [insert time period here] with no problems, so it can be done successfully. But my luck is traditionally not good enough to dodge this bullet, so my advice is to avoid it. To paraphrase Dirty Harry: Do you feel lucky?
Last edited by JimG; 04/03/10 09:27 AM.
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