Fuel Pumps...its hot ...fuel dries up
#3074837
09/06/22 04:05 PM
09/06/22 04:05 PM
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Joined: Jan 2003
Posts: 5,907 Athens, Greece
Pyper70
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,907
Athens, Greece
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Need a bit of assistance. Its a chore to get my engine kicking over because I seldomly drive her. Just life at the moment but I do love her and want to take her out. I have a 440 with Dual 500 Edelbrocks, an Edelbrock 120gph fuel pump thats a few years old. Stock fuel tank and sending unit. It can sometimes take 20-30min of constant cranking to get enough fuel to the carbs to get her to kick over. I even use Starting fluid to get a few low charged RPMs to suck enough fuel quicker. I have the Hemi Fuel Vapor separator but I haven't installed it yet.
My question is this:
Can I install an electric fuel pump back by the axle to PUSH the fuel forward to the mechanical fuel pump and then have it go into bypass so only the mechanical is working to suck the fuel or does the electric fuel pump have to constantly be pushing? Do they even make 7psi fuel pumps?
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: Pyper70]
#3074914
09/06/22 08:14 PM
09/06/22 08:14 PM
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Joined: Aug 2003
Posts: 43,257 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,257
Bend,OR USA
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I've delt with this issue for many years on my motors that have mechanical fuel pumps only, my solution to avoid cranking on the starter so much is to get some fresh gasoline and pour around 1 to 3 ounces down the front of each carb and hold the gas pedal down about 1/4 to 1/3 the way open from the idle position and keep the rpm under 2000 RPM as soon as you can control them after it starts and runs: up : scope: Let us know your results, hopefully it will help others on here: luck:
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: gold1950]
#3074938
09/06/22 09:08 PM
09/06/22 09:08 PM
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Joined: Jul 2003
Posts: 4,785 Holland MI Ottawa
2boltmain
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master
Joined: Jul 2003
Posts: 4,785
Holland MI Ottawa
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I won't answer the best setup for your needs and preferences but I can say that they make low pressure (5-8 psi) psi fuel pumps.
You can get really good, low-pressure fuel pumps at Summit or Jegs, and if you want something fast and cheap to test your theory, you can get a low-pressure electric fuel pump (7psi) off the shelf at Autozone or Orielly.
They will have them sitting there behind the counter. A supplemental low cost electric fuel pump at the tank is almost standard fare nowadays with cars that only drive on weekends and the standard fuel blends. Also, these pumps mentioned are very quiet unlike the traditional Holly Blue and Red pumps.
Keep old mopars alive.
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: A727Tflite]
#3074953
09/06/22 09:49 PM
09/06/22 09:49 PM
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Joined: Jan 2003
Posts: 20,855 A collage of whims
topside
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,855
A collage of whims
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I did the supplemental electric pump on my Hemi car - meaning in addition to the standard mech pump - but that car had 1/2" fuel line. I'd run the electric for about 30 seconds or so until I could hear it had filled the line. A few pumps while cranking over and the car would light. It also ran an MD6, MP distributor, and an F150 coil, which was a great addition. Headers, big cam, 11.70 car. The car might sit for a couple weeks to over 4 months of winter. Did a similar deal with one of my 383s - stock line, mech pump, AVS, ignition - and it didn't make much difference on that car. I used one of those low-PSI plastic pumps, but the darn thing also leaked, so got rid of it. The Eddy AVS2 on there now starts more quickly; I crank it maybe 30 seconds, then a couple pumps, and it lights. Sits about the same as the Hemi car did. My other 383, all stock, is about the same deal. A stout 512 I had was oddly the quickest of all my Mopars to light off, but was not fat. Holley, 3/8 line, Carter mechanical pump, same ignition as the Hemi. None of them had/have chokes. Temps typically 40s - 80s when starting. I've never had several minutes of cranking on anything unless something was wrong.
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: poorboy]
#3074974
09/06/22 10:23 PM
09/06/22 10:23 PM
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Joined: Jan 2003
Posts: 15,469 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,469
Omaha Ne
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For years I ran an electric pump in the fuel line just outside of the tank, that ran to the mechanical pump on the motor without issues. The electric pump was wired to turn on with the ignition and turn off with the ignition. Turn on the key, listen for the electric pump to slow down (about 20 seconds), and start the car like it ran yesterday. Pretty much ended long starter cranking times. But, I wasn't feeding a dual quad 440 either. mine can sit for a year, let the electric do it's thing, about 4-5 pumps, starts and dies, 2 more pumps it'll start, run on choke, droit into gear and drive away
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: TJP]
#3075003
09/07/22 12:48 AM
09/07/22 12:48 AM
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Joined: Feb 2003
Posts: 10,222 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
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Posts: 10,222
Someplace you aren't
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Did you mean to say 20-30 seconds? Minutes would mean something is bad wrong. Like a hole in a line, but you’d see that mess.
I want my fair share
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Re: Fuel Pumps...its hot ...fuel dries up
[Re: lewtot184]
#3075110
09/07/22 12:31 PM
09/07/22 12:31 PM
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Joined: Jun 2006
Posts: 5,165 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,165
CT
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20-30 minutes or 20-30 seconds?
If it takes 20-30 minutes you have another issue - check the fuel pump pushrod for wear.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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