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Unread 04-20-2014, 01:28 PM   #1
243
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1983 CJ7 
 
Join Date: Sep 2002
Posts: 3,282
Charcoal canister on TBI conversion?

After reading a bunch of threads on the charcoal canister I went out to find the GM canister that was on the 350, it has three ports, tank vent, purge and air cleaner that is plugged.

I plan to retain the check and rollover valves.

Since this canister is OEM, should I run it as is with the tank connected to the correct port and run a hose from ported vacuum on the TB to the other port?

What changed between the 80's AMC using manifold vacuum at the canister and the 88-92 GM using ported vacuum?

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Unread 04-20-2014, 07:35 PM   #2
243
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1983 CJ7 
 
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Posts: 3,282
I hooked up the rollover valve and liquid check valve per the AMC FSM and the GM charcoal canister to ported vacuum.

Apparently the GM pickups have a liquid check valve that fits on the fuel sender assembly on the fuel side, and only has one port straight to the fuel vent. Using common sense and logic, and that sometimes gets me in trouble, I think the liquid check valve is similar to the AMC liquid check valve, a simple float ball that closes off the vent when the fuel is topped off. As I stated in the liquid check valve thread, I closed the vapor bypass in the liquid check valve because the diaphragm was not working and would have let fuel into the tank vent line when I topped off the tank.

I am happy to have the charcoal canister hooked up because I would smell a heavy fuel odor when I topped off the tank, I think the fuel was making it all the way to the front and the vent line was completely open below the master cylinder.

I have the Haynes manual for 88-00 Chevy pickups and it does not cover in any detail the vapor system so I am winging it for now.
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Unread 04-20-2014, 08:15 PM   #3
Mike Romain
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Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
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Quote:
Originally Posted by 243 View Post

What changed between the 80's AMC using manifold vacuum at the canister and the 88-92 GM using ported vacuum?
AMC used ported vacuum to turn on a manifold vacuum purge on the later 1980's systems. On the early ones, they used a ported vacuum (air filter snout) purge with no turn on signal.

Both systems do the job.
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