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Author
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Topic: Holley Blue Fuel Pump
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84Ford50
Journeyman Posts: 5
From: Chandler, AZ USA
Registered: May 2004
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posted 05-04-2004 11:43 PM
   
I have just installed a Holley Blue Fuel pump. I bought it six years ago, but it sat in the box until recently. The pump is so loud. Besides the noise, I'm having a problem. I start the car, set the pressure at 6 PSI and leave it idle. After 15 minutes or so, the fuel pressure drops to between 1 - 3 PSI. The car just about dies. I swapped out the pressure gauges and it's accurate. I have 1/2" aluminum line running from pump to filter to regulator mounted on strut tower. the lines are free flowing without any blockages, any idea why the pressure is dropping?
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Dynoram
Journeyman Posts: 49
From: ford country
Registered: May 2003
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posted 05-05-2004 12:05 AM
Not too sure on this but i dont think any pump likes to be "deadheaded" for 15 minutes. My guess is its overheating. When fuel isnt flowing the pumps trying to fill a filled line causing it to strain. You can hear the pump wind down once the pressure is even in the feed line to the regulator. As for the noise there known for that. the older ones like the one you have are even worse. Did you use the rubber gasket between the mounting flange?[This message has been edited by Dynoram (edited 05-05-2004).]
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84Ford50
Journeyman Posts: 5
From: Chandler, AZ USA
Registered: May 2004
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posted 05-05-2004 12:34 AM
I used the rubber gasket between the pump and bracket. I'm just puzzled why it would possibly overheat. There aren't any restrictions. When the fuel pump "overheats", does it shut off? This pump makes the same consistant noise all of the time even when pressure drops.
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 05-05-2004 12:48 AM
We had a blue pump drop pressure like that during the runs. The car keep falling off and we couldnt figure out why. We had the fuel gauge mounted at the carb. It always showed good pressure when we check things. We moved the gauge up to the cowl where it could be seen going down the track. Sure enough it was dropping to 3 lbs of pressure during the run. We also ran 1/2" fuel line from the tank to the carb. Put a new pump on it and it fixed the problem. And yes they are very noisy.
Bud
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Scott (69Mach)
Gearhead Posts: 760
From: Walnut Creek, CA USA
Registered: Jun 99
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posted 05-05-2004 10:00 AM
Had a similar problem with mine. Ended up being a wiring problem on my part. Instead of using a relay and heavy guage wire from the battery (which I eventually did), I'd tied into the 12 volt system elsewhere. The wire couldn't flow enough juice, causing the pump to overheat and eventually fail.
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84Ford50
Journeyman Posts: 5
From: Chandler, AZ USA
Registered: May 2004
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posted 05-05-2004 04:56 PM
How do you know when it "overheats"?
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393Bird
Gearhead Posts: 134
From: Clarksville Tn.
Registered: Feb 2004
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posted 05-06-2004 09:04 AM
The best way to prevent pressure creep at long idle, and dropping at WOT, is to use a return system, and a large output pump.http://www.centuryperformance.com/fuel.asp Here is how mine is set up.  Mine engine:  ------------------
1993 Tbird
393 stroker, 3500 RPM converter
Lentech Street Terminator Plus
http://www.qsl.net/wd4ngb/birdwork.htm
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 05-06-2004 10:08 AM
quote:
Originally posted by 393Bird:
The best way to prevent pressure creep at long idle, and dropping at WOT, is to use a return system, and a large output pump.http://www.centuryperformance.com/fuel.asp Here is how mine is set up. Mine engine:
So are you not using a regulator before the carb? Just on the return side.
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393Bird
Gearhead Posts: 134
From: Clarksville Tn.
Registered: Feb 2004
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posted 05-06-2004 10:30 AM
Correct. I am using a Holley Black clone from Quickfuel that sends full output to the fuel log, and the return type regulator is set for 7 psi. Everything above this, is returned to the tank. This gives very even fuel pressure even if idling for 30 mins, or WOT. The fuel system does not have to catch up to large demands on it, the regulator just closes off more as the demand goes up. The fuel is already in the log waiting. My Brother-in-Law got me into using this, after watching his Super Comp roadster with a recorder on the fuel pressure sit at 9 psi after idling for 15 mins, then run the 1/4, and never dip below 8 psi. A side benefit, is it is almost impossible to have vapor lock with this system, since the fuel is always moving, and not being heated by a dead headed pump, or the engine heat.------------------
1993 Tbird
393 stroker, 3500 RPM converter
Lentech Street Terminator Plus
http://www.qsl.net/wd4ngb/birdwork.htm
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Bob Hopkins
Gearhead Posts: 362
From: BRIDGEPORT NJ USA
Registered: Jan 2001
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posted 05-06-2004 11:45 AM
Is my eyes not working right or am I thinklin backwards,but th pressure reg. looks backwards to me ,shouldn't you have inlet to reg. hooked to fuel log and outlet to return line ro regulat pressure in fuel log????.
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bud4660
Gearhead Posts: 518
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 05-06-2004 12:35 PM
quote:
Originally posted by Bob Hopkins:
Is my eyes not working right or am I thinklin backwards,but th pressure reg. looks backwards to me ,shouldn't you have inlet to reg. hooked to fuel log and outlet to return line ro regulat pressure in fuel log????.
If I understand what you said. Thats what I thought. Looks to me the pump pressure is on the carb all the time and the only thing being regulated is the return?? I'm confused??*****not the first time**** lol
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Dynoram
Journeyman Posts: 49
From: ford country
Registered: May 2003
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posted 05-06-2004 01:44 PM
On systems using fuel logs or rails its best to regulate it after the log. this way the regulator just bleeds off any excess pressure in the log so fuel flow will remain constant as the log is always full.
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Bob Hopkins
Gearhead Posts: 362
From: BRIDGEPORT NJ USA
Registered: Jan 2001
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posted 05-06-2004 04:11 PM
THAT is fine I agree about regulating after log being best it just looks to me that reg.is installet backwards and the inlet port on regulator should be towards the fuell log. How does fuel go back through the regulator ,may be I braindead but it looks to mt to be a deadend at reg. not reg ulated fuel???
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393Bird
Gearhead Posts: 134
From: Clarksville Tn.
Registered: Feb 2004
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posted 05-06-2004 08:08 PM
That is not a regular regulator, it is a bypass regulator. All pressure over the set point goes through the bottom fitting, back to the tank. That is for this regulator only, not all of them.------------------
1993 Tbird
393 stroker, 3500 RPM converter
Lentech Street Terminator Plus
http://www.qsl.net/wd4ngb/birdwork.htm
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Bob Hopkins
Gearhead Posts: 362
From: BRIDGEPORT NJ USA
Registered: Jan 2001
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posted 05-07-2004 02:01 PM
OK I'm a hardheaded old fart never had a bypass regulator system it would seem that the fuel would have to flow from inlet through reg.and be regulated and going the other way looks wierd to me!!!
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Bob Hopkins
Gearhead Posts: 362
From: BRIDGEPORT NJ USA
Registered: Jan 2001
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posted 05-07-2004 02:06 PM
Like I said I'm a hard headed old fart and the car is runnin so I guess it's right,BUT if I was there I'd have to pull the outlet line off to prove it to myself,and probably put the reg. on the other way just to see what's what!!! But that is the way I am!!!
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84Ford50
Journeyman Posts: 5
From: Chandler, AZ USA
Registered: May 2004
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posted 05-09-2004 08:23 PM
I took the fuel pump apart, and there are two magnets. One of the magnets was broken. Hmmm, I wonder if this would cause me problems? 
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bigblocked85
Gearhead Posts: 163
From: Waterford,MI
Registered: May 2003
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posted 05-13-2004 12:00 AM
My guess is that you dont have a vented tank and that your filler cap is not vented. Try unscrewing your cap and run it. I doubt that your broken magnet is bothering the performance of the pump as long as it's not in a bunch of pieces. You will probably just need to add a vent. Good luck, Gordon ------------------
Gordon Ross
85 Mustang GT
466 C-4 mini tubbed
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Mario428
Journeyman Posts: 76
From: Charlottetown, PEI, Canada
Registered: Nov 2001
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posted 05-13-2004 06:07 AM
quote:
Originally posted by 393Bird:
That is not a regular regulator, it is a bypass regulator. All pressure over the set point goes through the bottom fitting, back to the tank. That is for this regulator only, not all of them.
http://community.webshots.com/album/101990713qqxRWp This site shows how to turn a Holley deadhead regulator into a bypass regulator. Looks very slick to me, takes the needle and seat restriction out and makes a hi flow unit.
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Bob Hopkins
Gearhead Posts: 362
From: BRIDGEPORT NJ USA
Registered: Jan 2001
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posted 05-13-2004 01:44 PM
A {lightbulb on}now I understand it's a modified regulator and that setup looks alot beater,see you can teach a ole fart
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