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Help with a Holley

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Old Jul 4, 2009 | 04:21 PM
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Default Help with a Holley

I have a new holley carb 850 cfm double pumper which will not give me a pump shot to start the car. If you prime it with fuel it starts and runs/drives great, but it will not give me a initial pump shot to get it started. Fuel pressure, bowl levels, etc look good. Linkage looks likes its moving freely. Adjusted the pump arms with no luck. Any ideas?
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Old Jul 4, 2009 | 04:27 PM
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is the pump cam installed?
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Old Jul 4, 2009 | 04:29 PM
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i assume so...took off the old carb and put the new one on out of the box from holley.
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Old Jul 4, 2009 | 04:36 PM
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just ran out and checked, pump cam is there
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Old Jul 4, 2009 | 04:37 PM
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so when cold, there is not shot.
But when warm there is?

You have verified there is fuel in carb when cold?
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Old Jul 4, 2009 | 04:44 PM
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There is no pump shot if it is not running, cold or warmed up. If i dump some fuel in it and start it, everything works great. Fuel pressure is fine and fuel in bowls is right at the bottom of the sight plug.
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Old Jul 4, 2009 | 04:47 PM
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Originally Posted by buzzkill
There is no pump shot if it is not running, cold or warmed up. If i dump some fuel in it and start it, everything works great. Fuel pressure is fine and fuel in bowls is right at the bottom of the sight plug.
so do you think the fuel pressure is creating the squirt?
So the pump diaphram is cracked?
Check ball stuck?
a simple pump, check it.
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Old Jul 4, 2009 | 05:11 PM
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Originally Posted by buzzkill
I have a new holley carb 850 cfm double pumper which will not give me a pump shot to start the car. If you prime it with fuel it starts and runs/drives great, but it will not give me a initial pump shot to get it started. Fuel pressure, bowl levels, etc look good. Linkage looks likes its moving freely. Adjusted the pump arms with no luck. Any ideas?
this would'nt be the first time a brand new holley had to be torn down...
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Old Jul 4, 2009 | 05:49 PM
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make sure the pump screws are all tight. It could be sucking air when cold. If that doesn't help take the pump off and see if the diaphragm is installed right and there are no holes!
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