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Old 04-18-2012, 07:36 PM
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Holley xlr8r pump problem.

I've got a 350 cfm Holley 2300 on one of my hot rods. If I let it sit without running for a few days, the accelerator pump discharge needle valve sticks. It's a cylinder shaped piece with a point on the bottom end that serves as a check valve under the squirter. I can take the squirter nozzle off and probe it with a piece of wire to loosen it, but the problem has been chronic. I'm sure crap gas creates gummy residue which is causing it to stick. Anybody else had that problem with a Holley? I'd thought about replacing it with a small ball bearing. Any ideas?

Bob

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Old 04-19-2012, 08:42 PM
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24 hour bump -- Anybody?

Bob
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Old 04-20-2012, 08:52 AM
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Bob the short answer is yes, you can switch from a check needle to a ball. You will want to add a bit of weight on top of the ball the way the OEM did when they used the ball to give it some more weight to keep it in position.

If you are familiar w/how to form the seat by using a spare check ball and a thin punch, do that before using the ball. If you're not familiar, do a quick search or ask here.

The root of the problem may be the alky in the gas we now get is dissolving whatever deposits that had built up in the tank in the years prior to alky being introduced. If that's the case, the tank will need to be cleaned out, else the same thing could very well happen to the check ball.

I have found acetone works very good for removing deposits from a fuel tank that gasoline on a rag will hardly touch. Should you use acetone, work outdoors if possible or in a WELL ventilated area, use eye, skin and respiratory protection as well as keep it away from ignition sources. Acetone liquid burns really good, but acetone vapor in a gas tank is a bomb and if the air/fuel ratio is just right, if lit, this could injure or even kill.
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Old 04-20-2012, 10:12 PM
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Thanks for the response!

Bob
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