Charcoal Canister Operation? (3 Viewers)

[Tennessee80]

Whoosh, not hooch.

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[cheeese]

I was getting the gurgle from the rear passenger area, slight stumble off idle, and pressure release from the gas cap the other day. Suspecting a clogged canister I pulled over and released the pressure from the tank via the cap, but then the truck wouldn't hold idle without choke and especially would stumble and stall in neutral after being on throttle.

Today I explored a bit and noticed the elbow from OVSV to charcoal can was cracked, but following the FSM charcoal can test and clean procedure it did not appear to be clogged and I could hear the tank side check valve appearing to work properly.

Any ideas? Since it drove better with the tank and system under pressure it almost seems like insufficient fuel pressure from the mechanical pump, or some kind of vacuum lock in the fuel system.

 

[87nm60]

I was getting the gurgle from the rear passenger area, slight stumble off idle, and pressure release from the gas cap the other day. Suspecting a clogged canister I pulled over and released the pressure from the tank via the cap, but then the truck wouldn't hold idle without choke and especially would stumble and stall in neutral after being on throttle.

Today I explored a bit and noticed the elbow from OVSV to charcoal can was cracked, but following the FSM charcoal can test and clean procedure it did not appear to be clogged and I could hear the tank side check valve appearing to work properly.

Any ideas? Since it drove better with the tank and system under pressure it almost seems like insufficient fuel pressure from the mechanical pump, or some kind of vacuum lock in the fuel system.

Curious if you ever found a solution? I was out in mine on Sunday and ran into the exact same issue- stalled at a red light after being on throttle. When I got home and turned off the truck, I could hear an audible "whoosh" coming from the gas cap. When I unscrewed it, it almost shot off into my hand. Thinking about replacing the canister and seeing if that fixes it.

 

[MWM1]

If you are industrious, you can rebuild it. This is on my list to do and I purchased a spare for this.

Thread 'Charcoal Canister Rebuild'

Sep 26, 2020

This post was a great guide that convinced me to try this rather than just replacing it with the ACDelco 215-153. I will follow up once I have more miles on it and can confirm that all is working.

A few weeks before doing the rebuild, I had used carb cleaner (B-12) to free up the check valves in the tank port. The check vales did free up and I could get some air to flow through that port but it was pretty minimal. It turned out to be not enough and I was still getting a 'whoooosh' when I pulled the gas cap after driving.

During the rebuild, I THINK I found what was restricting...

• coultl
• Replies: 23
• Forum: 60-Series Wagons

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