Topic: ? on connection to fuel vapor cannister
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
Already a Member?
Click Here to Login
Not yet a Member?
Click Here to Register for Free!
Former Member
Send PM
MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
I'm about to start my ZZ4 for the first time and I was checking all connections when I noticed a rubber hose that was not connected. After looking for a possible connection point and not seeing anything to connect it to I did some research in my corvette assembly manual. It seems the hose is to connect to a Fuel Vapor cannister that should be located just under the Brake Booster on the driver's side. My problem is there isn't a cannister installed and not evidience that it was there before. 
The car an with the old engine before so the question is: can I start the new engine without it? Is it safe to run the car without the canister? Or do I have to buy a canister and installation parts and connect the hose?
The car an with the old engine before so the question is: can I start the new engine without it? Is it safe to run the car without the canister? Or do I have to buy a canister and installation parts and connect the hose?
SPONSOR AD:: (Our Sponsors help support C3VR)
Someone correct me if I'm wrong...the rubber hose comes from the top of the gas tank.It is an additional vent source that runs to the cannister,which absorbs odor,so there is no odor escaping into your garage.It is my understanding you can run car with no bad effects,other than the stink!
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Carl, is this hose coming from the frame, or is it hanging in the engine compartment? If it is not connected to the engine anywhere, then you should be good to go. If it comes up from the frame on the driver side, it is to the canister(which you don't have)...worked ok before, so I'd say leave it as it is, or stick a small filter of some kind in it to keep trash from getting up into the hose/line that goes to the fuel tank.
Fire that puppy UP!!!
Fire that puppy UP!!!
Joel Adams
C3VR Lifetime Member #56 
My Link 
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
The purpose of the vapor canister is to capture gas vapors from the gas tank, so that they are not released into the atmosphere when you open up your gas tank.
The vapors are stored in the canister until the next time the engine is run, and then they are fed into the engine to be burned off.
Yes, you can run without the canister, if you do, I believe you should 1) don't over fill the tank, thereby reducing the amount of gas vapors. 2) block off the vapor line from the gas tank. 3) use a NON presurized gas cap.
Former Member
Send PM
MARYSVILLE, WA - USA
Joined: 10/22/2006
Posts: 129
Vette(s): 1976 stingray, L48 COUPE, TH350 Automatic WITH A ZZ4 355 HP 350 C.I. MOTOR, 750 cfm HOLLY, EXTERIOR RED, INTERIOR BUCKSKIN, SMOKE BLACK GLASS TEE TOPS.
The hose is comming off the tube attached to the frame under the driver's side and the hose ends up in the engine bay just under and next to the proporation valve for the brakes. I think it will be ok to run the engine without it hooked up to the canister with all that your guys have said about it. I don't have a pressurized cap on the gas tank and with the cost of gas these days I won't be over filling it
Thanks guys! I guess once I figure out how to connect my electric choke wire up to one of the the wires on the windshiled wiper motor I will be ready to prime the oil pump and start that beast up. Cross your fingers that every thing will work. It's been a year since I started this project.
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
You can absolutely start the engine up without that hose being connected...no problem at all. It's apparently been that way for a while, so no sense worrying aboot it now! 
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
SPONSOR AD: (Our Sponsors help support C3VR)