Quote:
Originally Posted by geezer#99
You got too much fuel pressure!
Need a max of 5 psi.
It's flooding is why it idles rich.
And the smoke you saw was fuel vapor weeping thru the vacuum passage in the choke housing.
Fix the flooding and leave the choke alone.
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Thanks, geezer - your experience.insight may be solving a mystery for me. There was smoke coming from the choke chamber as well as from that edge of the carb air horn. It was surprising to read 9 PSI on the pressure gauge when checking the pump. Most of these Chev V8 pumps seem to show about 5, or maybe 6.
This pump came with the truck many years ago so don't know how or why its pressure would be higher than stock. And, the pump/carb/choke combo has worked great until those needle valves stuck and I then cleaned things up in there. But, can see how the better fuel flow into the bowls at higher pressure is enabling the flooding and rich idle.
Other than the gauge reading, how will I be able to tell from a part # etc. if it is a higher output or higher pressure rated pump? Have never seen a mechanical pump with a pressure adjustment on any of these trucks. Absent such adjustment, does a guy change the pump to a stock rated number, or put a pressure regulator in the line between pump and carb? Or, would lowering the float shut-off level in the bowls solve the flooding even with the 9 PSI?
Further advice/info desired. Thanks, again.