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post #1 of (permalink) Old 10-11-2000, 08:37 PM
**DONOTDELETE**
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Help me with my Holley

I need some help with my two barrell (2300 i think) Holley carb. The accelerator pump isn't working. Step on the throttle and no gas from the nozzles. I tried replacing the diaphragm but no go. The pump arm moves so the little cam is OK and the spray nozzles aren't plugged. Anuthing else I can check?? Please help!

78 convert :-)
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post #2 of (permalink) Old 10-11-2000, 09:18 PM
RolngThun
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Re: Help me with my Holley

If this is the two barrel Holley I'm thinking of. It looks just like the front half of a Holley four barrel.
If so Look to see if someone didn't have the bowl off and installed the gasket wrong. Some bowl gaskets only have one hole for the pump passage. If this hole ends up on the oppisite side of the pump,it will block this passage.
Alot of the newer gaskets have two holes to keep this mistake from happening.
There is also a check valve in the bowl, right above the diaphram. Get to it by removing the pump and diaphram. This will either be made of rubber going through a hole in the bowl or a metal ball held in by a little bar peened into the bowl. If this check valve has failed for any reason your pump will not work.
Adjust your pump so the lever starts to move as soon as the throttle does, and make sure there is at least .010" travel left in the lever at full throttle. This is so the pump is not bottomed out, ruining the diaphram and spring.
When I refered to lever I mean the one that pivots on the bowl pushing directly on the diaphram.
If you don't have the carb I'm thinking of, forget all that I have said.

post #3 of (permalink) Old 10-12-2000, 01:19 AM
**DONOTDELETE**
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Re: Help me with my Holley

it is the same carb thanks for the idea. I'll take a look at the gasket... how do I tell if the check valve is working? If it isn't what do I do?

78 convert :-)
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post #4 of (permalink) Old 10-12-2000, 05:48 AM
RolngThun
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Re: Help me with my Holley

The check valve is the fuel inlet for the pump. Since it is at the bottom of the bowl it collects alot of dirt. So the check valve may be plugged with dirt. The rubber type may have broke. The ball type could have the ball stuck.

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