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Old 06-17-2009, 10:32 PM
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holley blue ,fuel gage,erratic fuel pressures

Hey guy's I've got a 455 olds with approximately 500h.p. 800 edelbrock, e-brock heads ,fully rollerized etc. I have one of those infamous holley blue pumps on it with the supplied regulator.The problem is that when it's fired up on some occasions the needle on the pressure gauge will go crazy all the way to the back side of zero and fluctuate extremely.i will shut it off. Sometimes i will wait minutes and others over night to fire it back up,sometimes it will run at 5.5 p.s.i and other times it will go crazy again.I have tried three gauges (oil filled and regular) all read the same sort of nonsense going on.I have taken the pump apart and there is no junk inside and the vanes are fine.I was told that the by pass valve was sticking(by holley techs).I took it out and you could definately see scrapes on the valve where it had been sticking. sanded it down with emery cloth and lubed it and put it back in.Went home the other night it ran fine,next morning start up at 9-10 p.s.i. I pulled the valve again found scratch marks again,the pump had a divet in the passage so i changed the pump for a new one. Now there is another new pump in it and i reset the fuel pressure to 5.5 p.s.i. was good for a couple of runs and then the pressure went back up to 9-10 p.s.i. i reset it a couple of more times. By the time i got home the needle was going nuts again.By the way i replaced it with two new regulators and another diaghram. The vehicle doesn't even have150 miles on it yet any ideas i'm desperate and have no more ideas. (no return line,tank vents very well,pump is low on the frame and close to the tank, 3/8 fuel line) Has anybody had these symptoms?

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Old 06-18-2009, 05:23 AM
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You didn't say if you have an adjustable regulator on the pump. If you don't I would put one on. It needs to be close to the carb so you can see what pressure is going into the carb and adjust it accordingly.
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Old 06-18-2009, 05:36 AM
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Originally Posted by hammerhead
no return line
If I were a gambling man, I'd say you needed a return line, but that said- I've never had the problem you describe, even w/o a return.

Are you plumbing the gage to the regulator or at the fuel rail of the carb?
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