I put a holley red pump on the back of rear seats. Its mounted on a thick piece of rubber but it is still noisy. I can live with the noise,the real problem is It wont put out over 3 psi. Ive driven it about 10 miles with a couple of strong pulls and it hasnt ran out of gas. What can I do to get 6 psi? I also took the intank pump out

 

What did you put in place of the intank pump? Are you using any sort of regulator?

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
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ICON Motorsports

 

I put a piece of hose in place of the intank pump. I also cut a small v in the end of the hose. I had a regulator with the fuel return but I took it off because I thought it was my problem.

 

If you cut a big enough 'v' in the hose, it's probably collapsing and sucking itself shut

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'93 2wd truck
408 sb, vortecs, 454 TBI, Comp Cam, dual exhaust

 

anyone else have a holley red pump by the tank and a psi gauge under the hood, What kind of psi should I see?

 

More than what you are seeing. Put a metal piece of tubing in the tank, not rubber. The rubber will just give you problems years later, anyway.

Also, if you mount the pump substantially above the tank, it will not provide as much pressure. Mount the pump as low as you can, like on a frame rail or something, and make sure if you have a filtre BEFORE the pump, that is a high-flow filter. And make sure that ALL THE LINES that lead to the pump from the tank, including lines IN THE TANK, are at least 3/8" INNER DIAMETER, not OD. Should have 3/8" ID from pump to carb, too.

[This message has been edited by FastBroker (edited May 16, 2001).]

 

The Holley Red should put out about 15-18PSI if unregulated.

You getting a full 12V back to the pump? Measure for yourself and don't take it for granted if using a factory fuel pump 12V+ power line.

If you have a fuel pickup problem in the tank that's easy to diagnose- just fill a jar with some gasoline, sit it on the ground near the pump, run the pickup line into it and turn the pump on. Pressure should immediately improve if that's your problem.

 

I worked on it today. First I ran power to it straight off the battery. nothing changed. Then I pulled the line coming from the tank to see if the pump was getting fuel. Its getting plenty of fuel. I put everthing back together and tried it once more before i went back in the house, The Psi slowly made its way up to 5.5 psi. After about 5 minutes the psi slowly went down to 3 again.
All I can figure Is the pump isnt working like it should. The Hum from the pump is not constant it changes pitch and when it does the Psi needle bounces. Do I really need 6 psi. What if I just have 3

 

I had the same problem with my Holley Blue pump. Screwed around all last year never could get it to work consistently. I just went back to a mechanical pump. World of difference. No more annoying whine, and my engine doesn't peter out on the top end.

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1985 ASCD Ram Air Trans Am
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this is why i bought a mallory pump. im all for holley carbs, but im less than impressed with thr fuel pumps.

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85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker

 

Does the mallory pump whine like the Holley pump does. Im not impressed with this pump. It just wont do the 6 psi and the Whine is louder than my hooker exhaust

 

If you run a relay the pump will quite down and you will increase pressure.

 

Yes, you need 6PSI. 3 is not enough once you start making any kind of power. How you get there is entirely up to you. I have used Holley electric pumps with great success in the past, but it certianly does sound like you have a bad pump on your hands.

But before you go buy another pump and maybe STILL have the problem, make sure the pickup line does not have a hole or slash in it or a loose hose clamp somewhere. Allowing air to be sucked into the intlet side of an electric pump will cause it to put out almost no pressure since they don't pump air bubbles very well.




[This message has been edited by Damon (edited May 18, 2001).]

 

I Have a steady 9 psi now. I took the pump off the car and took it apart. I think the problem was the spring or the bypass valve. I stretched out the spring so it would hold more tension on the bypass. The needle dosent bounce it just holds a steady 9psi. The only thing I am scared of is springs loose there spring when you stretch them. I dont want it to fail on me later on.
Tell me what you think of this Idea. I leave it at the 9psi and put it back on the car. Then I put My mallory return regulator back on the car and set it at6-8 psi. Then the mallory regulator would be mainly for saftey so the psi could never get to high

 

the mallory pump is the quietest pump ive ever used. the holley is 3 times louder. also the mallory pumps seem to last longer, ive ran mallories until the brushes were worn down to nothing and i will replace the brushes (12.00 i think) and continue running them. ive had a holley pump die in less than a month of street use. just my experiences though, i do have a holley blue on my camaro right now. and it seems to be holding up ok.

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85 IROC 350 11:1keith blacks,.555lift erson roller cam,1.5 crane roller rockers,edelbrock intake,holley 4150 750dbl pumper, nitrous oxide,full length heddman headers,true dual exhaust, 11"stall converter, 700R4, 3.73 locker

 

I now have the noise down to a more acceptable Hum. I Put a thicker piece of rubber between the Pump and the sheetmetal. ;On the inside of the car I added a piece of rubber to isolate the bolts from the sheetmetal. I also used a couple of pieces of cork gasket with the thick rubber.
Next time I will go with a mallory.

Thank you all for your Help!
You have saved me a lot of time and Money since I found Thirdgen.org

Austin

 

I spoke to soon. I went out and tried it again today. When I first started the PSi was at 9 so I backed it down to 6psi. I made a few good pulls and it would miss. When I got home and popped the hood it was at 3psi. The Psi of the Holley pump drops when It gets Warm. What If I set it at Nine to start out with and let it drop to 6. Would Nine be to High?