Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
Float setting?
Jimpala:
Hello,my carb kit tells me 15/32 is the proper float height, could that be too much fuel in the bowl,as the air horn gasket is seeped in fuel?I notice the seeping of the air horn gasket starts on the corner where the black plastic cup is. And it seems to flood after shutting off when warm?
Is 15/32 right?? My carb # 17059218. I pulled off the top air horn assembly and noticed the black plastic cup was full to the top as well.I've sealed my bowl plugs,too.
Does anyone know the proper level off hand?? Thanks,Jim
Ethan1:
Welcome to CHP!
The stock float setting for that carb is indeed 15/32".
omaha:
15/32 is a big number. usually floats are set at ~1/4 inch. does this application have a small float? (that's the only thing that I think would have that low of a setting. (that setting is low, not high). might be too low of a setting. Hard to keep the needle on the seat when the bowl is next to empty. I think some investigating is in order. (maybe I am wrong but I have never heard of a setting like that. Is it measured the same as usual for floats? From the top of the casting to the toe of the float with slight pressure on the needle? Does this carb have some type of strange float that is uncommon? (I wouldn't think so) As far as the wetness goes, could be that the small "clip" on the needle is hanging off of the float arm in the wrong position. (causing the needle not to "seat" properly) (the small clip hangs off the edge of the metal arm NOT in the middle...{get the book it has a good picture}... or just get rid of the little clip altogether... not really needed if car used regularly)
Jimpala:
Hello Omaha,
Yes I've confirmed the float level is 15/32"and confirmed this in 2 different quality kits.Yes it's the smaller float,brand new nitrophyl.I've also confirmed float/needle clip attached correctly.I've rebuilt many Rochester 2 and 4 bbls over the years.
I feel confident the carb is fine.I just went through it.
After searching around on this very informative forum,I saw a comment by Cliff,stating that some of the new standard oem style mechanical pumps are manufactured with too high a fuel pressure! I'm running a '76 stock 350,nothing fancy.BUT....I did just replace the original AC Delco fuel pump as part of this fuel system freshening up.
I'm thinking I need to rig up a piece of hose to the inlet hard line at carb,and stick the head of my fuel pressure test guage to it and simply crank her over.It should not exceed 6-7 during cranking?And running pressure maybe slightly lower? My thoughts,Jim
--- Quote from: omaha on March 04, 2014, 11:02:57 PM --- 15/32 is a big number. usually floats are set at ~1/4 inch. does this application have a small float? (that's the only thing that I think would have that low of a setting. (that setting is low, not high). might be too low of a setting. Hard to keep the needle on the seat when the bowl is next to empty. I think some investigating is in order. (maybe I am wrong but I have never heard of a setting like that. Is it measured the same as usual for floats? From the top of the casting to the toe of the float with slight pressure on the needle? Does this carb have some type of strange float that is uncommon? (I wouldn't think so) As far as the wetness goes, could be that the small "clip" on the needle is hanging off of the float arm in the wrong position. (causing the needle not to "seat" properly) (the small clip hangs off the edge of the metal arm NOT in the middle...{get the book it has a good picture}... or just get rid of the little clip altogether... not really needed if car used regularly)
--- End quote ---
Ethan1:
--- Quote from: Jimpala on March 05, 2014, 03:41:39 PM ---Hello Omaha,
Yes I've confirmed the float level is 15/32"and confirmed this in 2 different quality kits.Yes it's the smaller float,brand new nitrophyl.I've also confirmed float/needle clip attached correctly.I've rebuilt many Rochester 2 and 4 bbls over the years.
I feel confident the carb is fine.I just went through it.
After searching around on this very informative forum,I saw a comment by Cliff,stating that some of the new standard oem style mechanical pumps are manufactured with too high a fuel pressure! I'm running a '76 stock 350,nothing fancy.BUT....I did just replace the original AC Delco fuel pump as part of this fuel system freshening up.
I'm thinking I need to rig up a piece of hose to the inlet hard line at carb,and stick the head of my fuel pressure test guage to it and simply crank her over.It should not exceed 6-7 during cranking?And running pressure maybe slightly lower? My thoughts,Jim
--- End quote ---
Which kits/parts did you use?
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