Rochester 2 bbl spewing out fuel - Chevelle Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 7 (permalink) Old Jul 1st, 19, 9:23 AM Thread Starter
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Jules
 
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Location: Mississauga, ON
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Rochester 2 bbl spewing out fuel

My carb spew's out a bunch of fuel after turning over. 1972 Chevelle Malibu 350cid, Rochester 2 bbl 2GV 7042114.

I'm looking for someone close by in my area ( Mississauga, Toronto GTA area ) that rebuild's carb's, I don't have the skill set for rebuilding carbs. I located a fellow in Ottawa, but I'd like someone closer.

Hard starting issue, the car had little driving time since I bought it last year. Followed a few threads here to help diagnose the root cause.

On a cold start it runs for 3-5 seconds then stops, as I crank it over a few seconds then I stop, a lot of fuel spews from the vent into the throat of the carb.

I believe it's either a dirty, worn or faulty needle valve and seat. Most likely dirty - Gosh dang, my fault for leaving the fuel tank low on gasoline! Probably sediment got through the filter. I've had this happen before with a 4 bbl holly on a 454, replaced the needle & seat and got up and running again, eventually replacing my old gas tank and fuel line filters.


I might as well get it rebuilt since I'm still planning the full restoration sequence and budget. If anyone has a referral, I really appreciate your help!


Many Thanks!
Best regards
Jules
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post #2 of 7 (permalink) Old Jul 1st, 19, 2:05 PM
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Ed
 
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Re: Rochester 2 bbl spewing out fuel

Quote:
Originally Posted by mymalibubu72 View Post
...I believe it's either a dirty, worn or faulty needle valve and seat. Most likely dirty - Gosh dang, my fault for leaving the fuel tank low on gasoline! Probably sediment got through the filter. I've had this happen before with a 4 bbl holly on a 454, replaced the needle & seat and got up and running again, eventually replacing my old gas tank and fuel line filters...
Probably varnish/whatever sticking in the car float, more than actual dirt. You can always try smacking it with a rubber/dead blow hammer while running. (pinch off the fuel line rubber to keep it from flooding with pliers)
We had a car do that once. It sat for years as well, the carb was OK after opening and just wiping everything in the bowl, but the tank took removal and cleaning to keep from clogging filters. I ended up putting driveway gravel, and tow chain in it, adding water, and shaking it around a LOT, then removed everything and rinsed/shook/rinse/shook until clear.
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1967 El Camino Malibu - Deepwater Blue
ZZ4 350, FiTech 600 complete!,Roadmaster tank, 700R4, Underdash A/C in progress, JGC Steering, 1990s truck serpentine.
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post #3 of 7 (permalink) Old Jul 1st, 19, 2:57 PM Thread Starter
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Re: Rochester 2 bbl spewing out fuel

Ed, I'll give that a try.

[ Added a few minutes later...] Wow! Ed you hit it dead on!! Did exactly as you said and it started instantly and is purring again.

I still need to have this carb cleaned/rebuilt to make it reliable in the meantime.

Many Thanks!
Best regards
Jules
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post #4 of 7 (permalink) Old Jul 1st, 19, 10:14 PM
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Re: Rochester 2 bbl spewing out fuel

not in Canada, but I recommend www.customrebuiltcarbs.com The shop is in NJ, good luck!!

Leo Paugh
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post #5 of 7 (permalink) Old Jul 1st, 19, 10:18 PM
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Ed
 
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Re: Rochester 2 bbl spewing out fuel

Quote:
Originally Posted by mymalibubu72 View Post
Ed, I'll give that a try.

[ Added a few minutes later...] Wow! Ed you hit it dead on!! Did exactly as you said and it started instantly and is purring again.

I still need to have this carb cleaned/rebuilt to make it reliable in the meantime.

Many Thanks!
Best regards
Jules
A good saying I learned at a radio control airplane club of all places "hammer it to fit, paint it to match". Or like we say in I.T. now, give it a "kinetic adjustment"
But actually, I'd run some good carb cleaner through it, spray it full of gumout down the vent tube to dissolve that crap. And keep a close eye, and carry spare fuel filters.

1967 El Camino Malibu - Deepwater Blue
ZZ4 350, FiTech 600 complete!,Roadmaster tank, 700R4, Underdash A/C in progress, JGC Steering, 1990s truck serpentine.
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post #6 of 7 (permalink) Old Jul 2nd, 19, 6:45 PM Thread Starter
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Jules
 
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Re: Rochester 2 bbl spewing out fuel

Thanks for the help guys! Got a referral from Antique Chevrolet when i grabbed a new accel cable about 2 hours ago.

A local company in Oshawa that's been doing it for 49 yrs. Carburetor Rebuilders Co. Ltd. | Carbrebuilders.com
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post #7 of 7 (permalink) Old Jul 3rd, 19, 7:35 AM
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Don
 
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Re: Rochester 2 bbl spewing out fuel

Back in the daywhen I worked in the Chevy dealership and those carbs were around it was pretty much standard procedure to replace the steel needle and seat in those 2BBL carbs when doing a tune up,or replacing the fuel filter.Any junk or dirt in the fuel bowl would get stirred up after the filter change and get in the needle and seat and they would flood like crazy.We would replace the needle and seat with a neoprene tipped needle along with a matching seat and problem solved.Probably took less than 20 minutes.
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