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Old 06-18-2018, 08:02 PM   #19
ahlsy
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Join Date: Jun 2017
Location: Victoria
Posts: 39
Re: 1972 K20 Suburban

I've also fixed the flooding problem with the factory quadrajet. I picked up a carb kit at the LPS and installed it. Truck ran better, but I had gas coming out of the accelerator pump bore with the float set at the recommended height of 3/16". Did a little checking, and found that internet wisdom recommended 1/4" minimum. Went there, but still had gas pouring out. Googled the problem a bit more, and found some guys saying 3/8 minimum. I settled on trying it at .325 inch, and it worked great.

While I was trying to figure out why I was pouring fuel out of the accelerator pump bore, I found some internet info saying that too high of fuel pressure might just be pushing the needle off the seat (basically overpowering the float). Seems plausible, and I had a pressure regulator sitting around from a previous project, so I ran a new line from the fuel pump, up to the regulator, ond into the carb through a new filter.
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