Tee at PCV - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72afr** · 01-20-2021, 03:13 PM

Hello all. I've mentioned previously about getting my '72 back into running shape and while I'm at it, redoing some things a younger me couldn't justify. As such, I'm looking into new hoses and lines to refresh a bit under the hood.

While my knowledge of engine innerworkings is less than some and more than others, I'm trying to learn more and actually fully understand how they all play together. Can someone explain what this tee near the PCV should go to on my '72 350 Q-jet or if I can remove the tee altogether and just run the line into the PCV?

Thanks!

**Steeveedee** · 01-20-2021, 03:24 PM

Probably to the vapor canister, to pull the fuel fumes off the charcoal. Is there a canister there, anymore?

54blackhornet · 01-20-2021, 07:21 PM

I don’t believe that hose configuration is original. The original hose from carb to PCV vale did have a provision to connect to vapor can. Small diameter hose.

geezer#99 · 01-20-2021, 07:27 PM

Quote:

Originally Posted by 54blackhornet

I don’t believe that hose configuration is original. The original hose from carb to PCV vale did have a provision to connect to vapor can. Small diameter hose.

X2

Looking closer shows the vac hose port right there by the choke stove.

**Steeveedee** · 01-20-2021, 07:59 PM

I had a SMOG license back in the day, but I guess I've been away from it long enough that I'm forgetting these things. And my truck is a big block 3/4T so didn't get a canister.

**72afr** · 01-20-2021, 09:03 PM

Quote:

Originally Posted by geezer#99

X2

Looking closer shows the vac hose port right there by the choke stove.

Right you are! After looking at it further this evening, I saw the hose laying there. Any reason to hook it back up? Someone disconnected it for a reason. The canister is there, I wonder if that might have a vac leak and was making the carb run bad.

truckster · 01-21-2021, 12:20 AM

The picture is cut off on the left. At the top left is the fresh air intake hose - that feeds fresh air into the valve cover from the air cleaner. On the opposite valve cover is you PCV valve. It should feed directly into the large port on the front of your carb. If you don't have an evap canister there's no need for any other connection on the PCV system.

Rich72C10 · 01-21-2021, 12:30 AM

Funny you should ask about a Tee on the PVC line. My current QJet (Carter) from a earlier truck (PO put it on) has a provision for it but I am sure my number matching Qjet (Rochester) does not. It is off to be properly rebuilt and tweaked for performance for a pretty penny. So I was on the hunt for a Tee that would fit the larger PVC and the small hose for the Fuel Vapor Canister (got a brass one off Amazon).

Anyways, this YouTube may prove helpful to you?

https://www.youtube.com/watch?v=8HmiBp9ibfU

ChevyRacefan · 01-21-2021, 01:14 AM

My guess, is someone used what he had on hand, Instead of going to get hose that reach, he used the 2 hoses and tee to hook the pcv to the carb, and another hose to the tee to close off the tee.
I have done stuff like this on the cheap winter car, that I don't want to spend money on. Over I'd go to the "junk" box of extra hoses, and such.

01-20-2021, 03:13 PM	#1
72afr Beep! Beep! Join Date: Nov 2003 Location: Rural, MO Posts: 282	Tee at PCV Hello all. I've mentioned previously about getting my '72 back into running shape and while I'm at it, redoing some things a younger me couldn't justify. As such, I'm looking into new hoses and lines to refresh a bit under the hood. While my knowledge of engine innerworkings is less than some and more than others, I'm trying to learn more and actually fully understand how they all play together. Can someone explain what this tee near the PCV should go to on my '72 350 Q-jet or if I can remove the tee altogether and just run the line into the PCV? Thanks! Attached Images __________________ 1972 Chevrolet C/10 shortbed, stepside, 350, HEI, Fire Engine Red, Black Interior, Former Army cargo transport 2003 Chevrolet 2500HD CC 6.0 4wd 2004 Jeep Rubicon some aftermarket stuff... 2019 Jeep Unlimited Rubicon (the wife's baby hauler)

01-20-2021, 03:24 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,789	Re: Tee at PCV Probably to the vapor canister, to pull the fuel fumes off the charcoal. Is there a canister there, anymore? __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

01-20-2021, 07:21 PM	#3
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,400	Re: Tee at PCV I don’t believe that hose configuration is original. The original hose from carb to PCV vale did have a provision to connect to vapor can. Small diameter hose. __________________ 71 C-20 07 Magnum RT AWD

01-20-2021, 07:59 PM	#5
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,789	Re: Tee at PCV I had a SMOG license back in the day, but I guess I've been away from it long enough that I'm forgetting these things. And my truck is a big block 3/4T so didn't get a canister. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

01-21-2021, 12:20 AM	#7
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 7,998	Re: Tee at PCV The picture is cut off on the left. At the top left is the fresh air intake hose - that feeds fresh air into the valve cover from the air cleaner. On the opposite valve cover is you PCV valve. It should feed directly into the large port on the front of your carb. If you don't have an evap canister there's no need for any other connection on the PCV system. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

01-21-2021, 12:30 AM	#8
Rich72C10 Mr. Cheyenne Join Date: Jun 2020 Location: Kyle, Texas Posts: 1,687	Re: Tee at PCV Funny you should ask about a Tee on the PVC line. My current QJet (Carter) from a earlier truck (PO put it on) has a provision for it but I am sure my number matching Qjet (Rochester) does not. It is off to be properly rebuilt and tweaked for performance for a pretty penny. So I was on the hunt for a Tee that would fit the larger PVC and the small hose for the Fuel Vapor Canister (got a brass one off Amazon). Anyways, this YouTube may prove helpful to you? https://www.youtube.com/watch?v=8HmiBp9ibfU __________________ Richard *'72 Chevy C10 Cheyenne Super WHT/MED BRONZE/WHT SBC 350 \| TH350 \| LWB \| AC \| Buddy Seats Upgrades:** Tilt \| Front Sway Bar \| Radio \| Sliding Window \| Bed Spare w/Lock Bed Rails \| Full LEDs \| Courtesy Lights \| Tachometer \| Glovebox Lock & Light \| Head Light Relays \| *Upgraded Fully Super Trim

01-21-2021, 01:14 AM	#9
ChevyRacefan Registered User Join Date: Sep 2013 Location: Newton,N.C. Posts: 319	Re: Tee at PCV My guess, is someone used what he had on hand, Instead of going to get hose that reach, he used the 2 hoses and tee to hook the pcv to the carb, and another hose to the tee to close off the tee. I have done stuff like this on the cheap winter car, that I don't want to spend money on. Over I'd go to the "junk" box of extra hoses, and such.



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