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Re: Can I run a mechanical and electric fuel pump? [Re: DaytonaTurbo] #74288
06/16/08 01:30 PM
06/16/08 01:30 PM
Joined: Apr 2007
Posts: 2,826
NY usa
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540challenger Offline
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540challenger  Offline
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NY usa
Quote:

I don't know what these pumps are you guys run that are so loud. I put a walbro 255 in my brother's rampage. It's it's the hi-pressure version of the walbro 255, and an external in-line unit. It's the highest overall flowing 255 series pump made by walbro. And with the little dinky 2.2 running, I can't even hear the pump running. Someone has got to make a good flowing, low psi pump for carb apps that isn't overly loud. Run it with a return-style regulator and it'll both keep your fuel cold and evacuate any vapors out of your line. And it'll fill your carb bowls right back up before you even turn the key. Seems like a no-brainer to me if you've having evaporation and or vapor lock issues and cannot solve them.




The loud pumps are those holleys, But once the car is running you usually don't hear them over the engine.

Re: Can I run a mechanical and electric fuel pump? [Re: 540challenger] #74289
06/16/08 02:00 PM
06/16/08 02:00 PM
Joined: Sep 2005
Posts: 2,179
California, USA
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blairboy3 Offline
top fuel
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California, USA
I've got the new Holley HP150 w/ the gearotor style pump. It's pretty dang quiet. Can't hear it over the engine, and just a bit of a hum when the engine is off.


1968 Plymouth Fury III 4-Door: 12.79 @ 115, 60'- 1.93 (Hey... it's a Cruise ship... what do you expect?!) Famoso Raceway, 02/08
Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74290
06/16/08 04:30 PM
06/16/08 04:30 PM

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Anonymous
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rubber isolate the pump.. problem solved.

Re: Can I run a mechanical and electric fuel pump? #74291
06/16/08 04:36 PM
06/16/08 04:36 PM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Quote:

rubber isolate the pump.. problem solved.




Been there, done that, no help. See my post above. I even hung the pump from plastic wire ties (from the rubber isolated mount) to isolate it. I think most of the sound is coming from the metal fuel lines.

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74292
06/16/08 04:43 PM
06/16/08 04:43 PM

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get out the drill/drill bits, goto home depot or whereever get some rubber isolated line holders (forgot the tech name for them),
install them to keep the lines off the frame. reroute if you have to. prob solved again.

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74293
06/16/08 06:53 PM
06/16/08 06:53 PM
Joined: Feb 2005
Posts: 4,309
Prospect, PA
BSB67 Offline
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Quote:

My GTX keeps vapor locking after I turn it off (fuel boiling out).




Can you restate exactly what the problem is or the symptom(s) and any evidence for your conclusion. This description sounds possibly like two completely different issues.

Re: Can I run a mechanical and electric fuel pump? [Re: BSB67] #74294
06/16/08 08:49 PM
06/16/08 08:49 PM
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Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Quote:

Quote:

My GTX keeps vapor locking after I turn it off (fuel boiling out).




Can you restate exactly what the problem is or the symptom(s) and any evidence for your conclusion. This description sounds possibly like two completely different issues.


ding ding ding we have a winner. You have too much heat in the intake/carb.yes properly setting up an electric to fill the bowls for the next days restart is good but it's about solving the real problem. heat riser? lower temp 'stat? blocking the crossover. cooling system mods? PS I think a carb spacer(wood not alum) would be a major help. Would it be possible for you to run one if you went to a lower height drop base aircleaner?

Last edited by RapidRobert; 06/16/08 09:07 PM.

live every 24 hour block of time like it's your last day on earth
Re: Can I run a mechanical and electric fuel pump? [Re: RapidRobert] #74295
06/16/08 09:17 PM
06/16/08 09:17 PM
Joined: Sep 2005
Posts: 2,179
California, USA
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blairboy3 Offline
top fuel
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California, USA
Changing from an Edelbrock (Fuel bowl sits on the manifold) to a Holley (fuel bowl up & away from he manifold) would solve the problem too! Plus, Holleys are better


1968 Plymouth Fury III 4-Door: 12.79 @ 115, 60'- 1.93 (Hey... it's a Cruise ship... what do you expect?!) Famoso Raceway, 02/08
Re: Can I run a mechanical and electric fuel pump? #74296
06/16/08 09:27 PM
06/16/08 09:27 PM
Joined: Dec 2006
Posts: 413
northeast ohio
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mkdart Offline
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northeast ohio
I run an 3 prong filter.One in/2 out,the 2nd outlet vents to the tank. Works for me.
Mike

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Re: Can I run a mechanical and electric fuel pump? #74297
06/16/08 09:28 PM
06/16/08 09:28 PM
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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MoparforLife Offline
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Upper Midwest
Quote:

If the mechanical pump diaphragm ruptures, it will STILL pump gas into the pan, whether you have an electric pump or not!!! You are just as likely "not" to notice the problem, either way.



I don't know what train of though that this comes from but --- -- If the diaphram ruptures in a mechanical plum there is no fuel going to be pumped to get into the oil pan,. The only way fuel will get int tthe pan is if the the vehicle gets parked in such a way as to have the tank at a level that is higher than the fuel pump location and the fuel can syphon out. This is entirely possible and I have seen it happen many times just taking the lines off to put on a new pump but to pump the fuel forward with a broken diaphram is obsurd. Pumping the fuel into the pan with an electric pusher is entirely possible and plausible.

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74298
06/16/08 10:12 PM
06/16/08 10:12 PM
Joined: Jan 2003
Posts: 8,144
Arkansas
340727dart Offline
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Arkansas
I have such a setup on my '73 Dart Sport. I've got the Carter street mechanical pump and a Carter street electric pump with 3/8" fuel line.
Since I only drive the car about once a week, the fuel has evaporated out of the carburetor when I try to start it.
I turn on the electric pump for 15 to 20 seconds, pump the gas pedal once (no choke), and the engine fires right up.
I'll let the electric pump run for a few more seconds after the engine is running then shut it off before I start driving.


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Re: Can I run a mechanical and electric fuel pump? [Re: 340727dart] #74299
06/16/08 11:27 PM
06/16/08 11:27 PM
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Sarcoxie, MO, USA
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MoPar Jamie Offline
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I'm running a Mr. Gasket HP pump (4-7 PSI I think) in my '86 D-150 along with a mechanical pump. Reason being that the cam lobe is worn out on the 400 so it wouldnt pump fuel. I left the vent line and the return line open and ran a conventional filter. Worked fine for me. BTW I mounted the pump on the frame under the bed, halfway between the tank and mech. pump. Had two holes already punched there and they worked great for mounting.


- MoPar Jamie

1972 Fury III 4dr
1986 D-150 LWB Royal SE
Re: Can I run a mechanical and electric fuel pump? [Re: blairboy3] #74300
06/16/08 11:27 PM
06/16/08 11:27 PM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Quote:

Changing from an Edelbrock (Fuel bowl sits on the manifold) to a Holley (fuel bowl up & away from he manifold) would solve the problem too! Plus, Holleys are better




I have a Holley 750 double pumper on the car now.

Re: Can I run a mechanical and electric fuel pump? [Re: mkdart] #74301
06/16/08 11:28 PM
06/16/08 11:28 PM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Quote:

I run an 3 prong filter.One in/2 out,the 2nd outlet vents to the tank. Works for me.
Mike




I have the return line on the filter also (3/8" in and out with a 1/4" return to tank).

Re: Can I run a mechanical and electric fuel pump? [Re: RapidRobert] #74302
06/16/08 11:34 PM
06/16/08 11:34 PM
Joined: Mar 2003
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Tri-Cities, Washington
Quote:

Quote:

Quote:

My GTX keeps vapor locking after I turn it off (fuel boiling out).




Can you restate exactly what the problem is or the symptom(s) and any evidence for your conclusion. This description sounds possibly like two completely different issues.


ding ding ding we have a winner. You have too much heat in the intake/carb.yes properly setting up an electric to fill the bowls for the next days restart is good but it's about solving the real problem. heat riser? lower temp 'stat? blocking the crossover. cooling system mods? PS I think a carb spacer(wood not alum) would be a major help. Would it be possible for you to run one if you went to a lower height drop base aircleaner?




Boy do I have a heat problem under the hood. I can not even touch the air cleaner within the first 30 minutes or it will blister my fingers.

I have no heat riser and I can not change the air cleaner (I have an Air Grabber hood), this means no spacer.

I haven't tried changing the stat or redoing the cooling system. I have a stock rad/clutch/fan/shroud. Keeps me under 210 on the road (including stop and go traffic). The under the hood temp is amazingly high, been that way since I've owned it.

Not sure what to do, I want to keep the stock look if possible but don't know how to bring the temp down under the hood.

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74303
06/17/08 02:50 AM
06/17/08 02:50 AM
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Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Van I was wondering if your bathtub intake gasket has open crossover passages & if your timing is in the ballpark?


live every 24 hour block of time like it's your last day on earth
Re: Can I run a mechanical and electric fuel pump? [Re: RapidRobert] #74304
06/17/08 10:54 AM
06/17/08 10:54 AM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Tri-Cities, Washington
I don't know if the cross over is there or not. I have an Eddy 440 Performer manifold ( I need to check and see if it even has a cross over).

My timing is setup by Don at FBO. I believe it's 18 intitial, 36 total (close to that).

I wonder if replacing the fan with a fan that does not have a clutch would help keep the under hood heat down

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74305
06/17/08 11:02 AM
06/17/08 11:02 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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RapidRobert Offline
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Lincoln Nebraska
your timing is good. I'd be willing to bet my last $ that changing the bathtub gasket to a closed one would solve alot of this & a wood carb spacer would be nice but no way around that at this point in time.


live every 24 hour block of time like it's your last day on earth
Re: Can I run a mechanical and electric fuel pump? [Re: RapidRobert] #74306
06/17/08 12:20 PM
06/17/08 12:20 PM
Joined: Mar 2003
Posts: 4,915
Tri-Cities, Washington
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VITC_GTX Offline OP
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Thanks for the help.

I will add "Install new valley pan" to my to-do list.

Re: Can I run a mechanical and electric fuel pump? [Re: VITC_GTX] #74307
06/17/08 02:36 PM
06/17/08 02:36 PM
Joined: Apr 2003
Posts: 3,968
North Riverside IL & Lowell IN
GTXKen Offline
super gas
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Posts: 3,968
North Riverside IL & Lowell IN
My GTX runs hot as well but I didn't use my airgrabber hood and run a 2" spacer.

I am waiting for my new distributer from Don at FBO and I hope that helps. Don thiought it would but obviously it didn't help you.

I just installed a high flow thermastat and that helped a lot. I also moved my fuel line from the stock route to a braided line from the feed to the fender and down to get it away from the block.

I think adding another fuel pump is just masking the problem, a new thermastat is like 10

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