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Old 08-26-2006, 08:57 PM
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Fuel pumps issues....cont/new

OK, I replace the holley 110 gph 6.5 - 8 psi fuel pump (# 12-327-11) with a new, identicle, pump after no luck finding a rebuild kit for the broken pump. Holley (and Carter, same pump) dont' stock replacement diaphrams any more due to lack of demand.

Now the holley truck avenger carb is pouring fuel through the vents.

This pump is not supposed to require a pressure regulator but it is overpowering the needle and seat. I replaced the needle and seats and the primary float with a brass float this evening but have yet to install the carb (tomorrow mornings task).

This is a head scratcher.

I had zero problems with the previous identicle pump, until recently when it quit pumping.

What gives???

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Old 08-27-2006, 03:03 AM
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too much fuel pressure gives. You`ll have to install a regulator, it doesn`t matter if it doesn`t require one, many pumps I`ve used said the same thing, but they never check the pump at the factory to see what the pressure is, all mine had to have a regulator. Also I would install a gauge, without one is the same thing as going blind. One I recall said it didn`t go over 5 psi, it had 9 psi.
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Old 08-28-2006, 10:45 AM
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After installing the carb with new needles, seats and primary float (the parts store only had 1 float), the overflowing problem went away.

I'll put a pressure guage inline when I replace the neo secondary float with a brass one.

I think I need to bend the float arms to be able to adjust the float to the proper level. When adjusting the fuel level belowe the sight hole, the needle was held closed. That took a while to figure out.

I have an extra holley adjustible pressure regulator but it has 2 outlets. Will it work properly if I plug one of the outlets? I can't think of why it wouldn't but thought I'd ask anyway.

Chap-stick works wonders. It's made the brown gaskets more reusable than the blue gaskets.
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Old 08-28-2006, 11:10 AM
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The two outlets are for running dual carbs. You can block off one and run the other with no problems. I'd just bite the bullet and run a pressure regulator. You will have this problem EVERY time you change something in the fuel circuit...one combination setup works, while another won't. Pressure regulators are cheap, and can be cheaper in the long run, depending on how many times you have to buy carb parts that can withstand the fuel pressure, or pumps that can stay under the max pressure your carb can tolerate.

I have been down that road many times...

George
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