Rochester monojet question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mark B · 01-30-2006, 10:49 PM

My 250ci 6 cyl has a Rochester Monojet carb.
At the base of the card, and facing toward the front left fender is a vent hose, which is now cut short and plugged with a screw. Does anyone know what this line is for?

thanks
Mark

Gordo · 01-31-2006, 09:56 PM

It could have lead to the air filter housing. It would operate the valve in the snorkel to regulate pre-heated and fresh air, or it could have operated the vacuum choke pulloff diaphram. Take another close up pic with the air filter assembly removed.

68haywagon · 01-31-2006, 10:12 PM

Its a vacuum line. Get some caps and get rid of the hose.

Mike

71meangreenc10 · 01-31-2006, 10:19 PM

Looks like (if Iam right about the picture) you have dual pulleys which would indicate that its a vacuum line that ran to the smog pump diverter valve, you can check the head on the carb side and see if there are plugs along it.

Thats how my 68 was.....

Smitty

01-30-2006, 10:49 PM	#1
Mark B Registered User Join Date: Oct 2005 Location: Ontario, Canada Posts: 145	Rochester monojet question My 250ci 6 cyl has a Rochester Monojet carb. At the base of the card, and facing toward the front left fender is a vent hose, which is now cut short and plugged with a screw. Does anyone know what this line is for? thanks Mark Attached Images

01-31-2006, 09:56 PM	#2
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	Re: Rochester monojet question It could have lead to the air filter housing. It would operate the valve in the snorkel to regulate pre-heated and fresh air, or it could have operated the vacuum choke pulloff diaphram. Take another close up pic with the air filter assembly removed. __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

01-31-2006, 10:12 PM	#3
68haywagon I'm watching you! Join Date: Feb 2005 Location: Levittown, PA Posts: 1,822	Re: Rochester monojet question Its a vacuum line. Get some caps and get rid of the hose. Mike __________________ 2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold

01-31-2006, 10:19 PM	#4
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Rochester monojet question Looks like (if Iam right about the picture) you have dual pulleys which would indicate that its a vacuum line that ran to the smog pump diverter valve, you can check the head on the carb side and see if there are plugs along it. Thats how my 68 was..... Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.