carb making a strange noise... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

surfacerust · 05-16-2011, 04:12 PM

so i finally got exaust on the 250 six in my truck. and now that its nice and quiet i was going to adress the idol issues.

and i noticed the carb is making a noise like when your cup is empty at burger king. this slurping sound. i mean its runs "ok" its got alot of hesitation and such, and i think it just needs rebuilt.

carb is a rochester model B.

ideas?

hdck07 · 05-17-2011, 09:29 AM

You may try taking out the carb and tightening the bottom part of the carb to the middle section. The Phillips head screws that come in from the bottom. After a recent rebuild mine came loose (no loctite or tightened enough) This caused a terrible vacuum leak and some odd noises.

Jack_71C10 · 05-17-2011, 03:37 PM

I have an intake leak that causes a whistle sound to come out my carb.
Maybe you have something similar.

surfacerust · 05-17-2011, 07:39 PM

i made a new gasket for the bottom when i first got the engine, and the bowl to base screws are pretty tight. its like slurping

its kinda funny!

i think its where the top meets the bowl. the venturi goes down thru the middle of the fuel bowl and im thinking if there is a breech in the gasket itll suck air and maybe a little fuel if the level is high enuff in the bowl. this would explain only having to take the fuel screw out like half a turn.

imma bust out the gasket material and make a replacement for the bowl to base and the top one as well and see what happens.

sound good?

05-16-2011, 04:12 PM	#1
surfacerust Registered User Join Date: Apr 2008 Location: Tunnelton, WV Posts: 38	carb making a strange noise... so i finally got exaust on the 250 six in my truck. and now that its nice and quiet i was going to adress the idol issues. and i noticed the carb is making a noise like when your cup is empty at burger king. this slurping sound. i mean its runs "ok" its got alot of hesitation and such, and i think it just needs rebuilt. carb is a rochester model B. ideas?

05-17-2011, 09:29 AM	#2
hdck07 Registered User Join Date: Dec 2009 Location: Boonville, MO Posts: 26	Re: carb making a strange noise... You may try taking out the carb and tightening the bottom part of the carb to the middle section. The Phillips head screws that come in from the bottom. After a recent rebuild mine came loose (no loctite or tightened enough) This caused a terrible vacuum leak and some odd noises.

05-17-2011, 03:37 PM	#3
Jack_71C10 Shortbed club member Join Date: Jan 2008 Location: Halethorpe, MD Posts: 439	Re: carb making a strange noise... I have an intake leak that causes a whistle sound to come out my carb. Maybe you have something similar. __________________ 71 custom/10 6.0/4L80E SWB ece 4/6 72 custom camper 350/3 spd 2020 Chevy Express 3500 2023 Hyundai Tuscon 1986 GMC 3500 Bucket Truck Sent from my Rotary Phone via 14.4kb/s modem.

05-17-2011, 07:39 PM	#4
surfacerust Registered User Join Date: Apr 2008 Location: Tunnelton, WV Posts: 38	Re: carb making a strange noise... i made a new gasket for the bottom when i first got the engine, and the bowl to base screws are pretty tight. its like slurping its kinda funny! i think its where the top meets the bowl. the venturi goes down thru the middle of the fuel bowl and im thinking if there is a breech in the gasket itll suck air and maybe a little fuel if the level is high enuff in the bowl. this would explain only having to take the fuel screw out like half a turn. imma bust out the gasket material and make a replacement for the bowl to base and the top one as well and see what happens. sound good? Last edited by surfacerust; 05-17-2011 at 07:39 PM.



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