Re: Can I run a Mechanical and Electric fuel pump together?
[Re: domingo]
#1299115
09/07/12 04:37 PM
09/07/12 04:37 PM
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Joined: Dec 2009
Posts: 20,720 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,720
in a cattle trailer down by th...
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You can run an electric pump with the mechanical but you won't be able to turn it off and expect the car to still run. I would suggest just building a real fuel system for it and get rid of the mechanical pump.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: Guitar Jones]
#1299116
09/07/12 05:35 PM
09/07/12 05:35 PM
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Joined: Sep 2003
Posts: 10,645 Houston, Tx
AlexP
I Live Here
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I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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Quote:
You can run an electric pump with the mechanical but you won't be able to turn it off and expect the car to still run. I would suggest just building a real fuel system for it and get rid of the mechanical pump.
I would ditch the mechanical pump all together.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: 67Satty]
#1299119
09/07/12 05:57 PM
09/07/12 05:57 PM
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Joined: Mar 2008
Posts: 264 Westbury, NY
cowbay
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 264
Westbury, NY
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Years ago there were a few classes that actually required both mechanical and electrical fuel pumps
"Alcohol is for drinking, gas is for cleaning parts, and nitro is for racing!"
original author unknown, used by Gene Adams and Don Garlits among others
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: domingo]
#1299121
09/07/12 06:39 PM
09/07/12 06:39 PM
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Joined: Jan 2003
Posts: 403 southern Maryland
keefe
mopar
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mopar
Joined: Jan 2003
Posts: 403
southern Maryland
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on my gtx i use the carter (street strip ) mechanical and the carter electric pump at the tank. I only use the electric at the track, it had the stock 5/16 gas line. car use to go high 12's to low 13's, was my daily driver. The electric pump finally crapped out a few months ago after 30 years..LOL With out the electric the car would dang near cut off when you shifted in to third. Keefe
Last edited by keefe; 09/07/12 06:44 PM.
1971 duster twister 440, 3380#,509 M/P hyd,906's,full Exhaust,11.06@117.46 1/4,6.95@ 97.03 1/8,1.497 60ft.....
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: domingo]
#1299122
09/07/12 06:44 PM
09/07/12 06:44 PM
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Joined: Dec 2009
Posts: 20,720 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,720
in a cattle trailer down by th...
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Quote:
This is just a quick fix....OK...Ill just ditch the mechanical.
But Id like to understand why it is not adviseable....I have seen people do it with no problems.....
If you have the electric pump plumbed in series the mechanical is going to have to suck through that vane pump which isn't going to work very well at all.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: Guitar Jones]
#1299123
09/07/12 06:55 PM
09/07/12 06:55 PM
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
OP
EL Master
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OP
EL Master
Joined: Jan 2003
Posts: 9,670
Lima, Peru
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Quote:
Quote:
This is just a quick fix....OK...Ill just ditch the mechanical.
But Id like to understand why it is not adviseable....I have seen people do it with no problems.....
If you have the electric pump plumbed in series the mechanical is going to have to suck through that vane pump which isn't going to work very well at all.
but the mechanical is gonna get more fuel than it can suck....so I guess fuel will just get pushed through it???? I would have the electrical on the whole time...
I know I should just bypass it, im just trying to understand completely what is happenign, i want to learn.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: Guitar Jones]
#1299124
09/07/12 06:56 PM
09/07/12 06:56 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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I used to run an electric before the mech pump. Never had a problem. Many years ago I had a starvation issue. Put a red pump before the mech and never had a problem.
2 other buddys did the same thing with their sbcs.
A member on here has a red pump before his mech pump also. Never a problem also.
One thing to keep in mind if you put a blue pump before the mech pump you might have to put a reg after the mech pump. Im not sure on that??
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: domingo]
#1299125
09/07/12 07:01 PM
09/07/12 07:01 PM
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Joined: Dec 2009
Posts: 20,720 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,720
in a cattle trailer down by th...
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Quote:
Quote:
Quote:
This is just a quick fix....OK...Ill just ditch the mechanical.
But Id like to understand why it is not adviseable....I have seen people do it with no problems.....
If you have the electric pump plumbed in series the mechanical is going to have to suck through that vane pump which isn't going to work very well at all.
but the mechanical is gonna get more fuel than it can suck....so I guess fuel will just get pushed through it???? I would have the electrical on the whole time...
I know I should just bypass it, im just trying to understand completely what is happenign, i want to learn.
If the electric pump is on then it's not a problem, it's only a problem if you turned it off.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Can I run a Mechanical and Electric fuel pump together?
[Re: domingo]
#1299131
09/07/12 07:38 PM
09/07/12 07:38 PM
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Joined: Dec 2009
Posts: 20,720 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,720
in a cattle trailer down by th...
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Quote:
It is not vapor locking...its got exh manifolds and the temperature here is very mild.
Everything on the car is NEW. Ignition is a newer electronic (stock).
I had some electrical trouble once while driving at night with the hi beams on because I have the original rebuilt 35 amp alternator and the headlights were on....and seems that the alternator didnt out out enough outup to charge the battery.....so I was cruising and all of a sudden the car started missing. I turned on the lights to just the running lights and waited it to recgarge and it was all OK again.
Now, the car doesnt ever miss.....But when I took it to the track it missed on 3rd top end. It didnt miss at all in 1st or 2nd. Made a couple more passes and the same thing.....it missed on the top end on 3rd.
So what Im guessing is that it starving for fuel at some point?????
Am I right????
This is why I want to put the Holley Blue electrical pump before the mechanical. I have seen it done before and the cars run fine,....
Now IM being told here not to do that, and just "build a re
You are not being told not to do that. You are being told you won't be able to just turn the electric pump on at the strip.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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