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Charco Canister?

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Old Jun 29, 2009 | 04:59 PM
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Default Charco Canister?

Hey all,

I have an 81 can with 5 hoses.
1 hose from carb through Thermal valve to can.
This is the signal hose that opens the valve for purge.
The valve holds vac, so this is good right?

another hose from can that hooks in with the pcv valve into the
throttle plate. This, I believe is the line that purges the can when the signal valve is opened with vacuum.

Can someone confirm or deny this?


Last edited by calwldlife; Jul 1, 2009 at 05:23 PM.
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Old Jun 29, 2009 | 09:14 PM
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St. Jude Donor '22
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All the views and no body will check their
systems?
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Old Jul 1, 2009 | 05:23 PM
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Old Jul 1, 2009 | 05:38 PM
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Would help if I could. My 79 had this many lines, but I ripped them all off. When I put it back together I'll just run the pvc line over to it to pull in the tank fumes & not worry about anything else. I'm sure someone will check tonight.
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Old Jul 1, 2009 | 07:11 PM
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have an 81..but have no can. no hoses . no help
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Old Jul 1, 2009 | 07:33 PM
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Thanks for replying guys.
I have it disconnected.
I will need too figure it out come smog test time.
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Old Jul 3, 2009 | 08:34 AM
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Originally Posted by calwldlife
Hey all,

I have an 81 can with 5 hoses.
1 hose from carb through Thermal valve to can.
This is the signal hose that opens the valve for purge.
The valve holds vac, so this is good right?

another hose from can that hooks in with the pcv valve into the
throttle plate. This, I believe is the line that purges the can when the signal valve is opened with vacuum.

Can someone confirm or deny this?

Short answer would be yes your right the PCV hose is going to do the purging. I don't have an 81 to look at but I have my 81 manual. I have a drawing of the system and I have an emission label. Its still not totally clear enough to say for sure but I still think your correct. The unclear part I think you can clear up. You have 2 control valves on the top of the canister-each one will have a control hose-one of the control hoses goes as you said to the thermal valve-where does the other control valve hose go ? Does it go to the base of the carb (most likely)or does it T in to the purge line that goes to the PVC hose (not likely)? If it goes to the base of the carb then you were correct.

Not sure why there are 2 control valves but would guess its some kind of balancing or cycling so the PVC system is not starved.
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Old Jul 3, 2009 | 09:21 AM
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Originally Posted by calwldlife
Thanks for replying guys.
I have it disconnected.
I will need too figure it out come smog test time.
I feel for you on getting it past emissions.
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Old Jul 3, 2009 | 11:11 AM
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Thanks DW.

I have the FSM and yes, it is unclear.

1 hose from bowl
1 hose from tank
1 hose from air cleaner
1 hose from TVS
1 hose from T that joins the PCV

If I did not have too order one, I could put a vacuum pump to
each line at the store and see what is what.

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Old Jul 3, 2009 | 11:16 AM
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Originally Posted by calwldlife

1 hose from bowl
1 hose from tank
1 hose from air cleaner
1 hose from TVS
1 hose from T that joins the PCV
Dont you have 1 more small hose coming from the base of carb going down to the canister ?
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Old Jul 3, 2009 | 11:22 AM
  #11  
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Originally Posted by DWncchs
Dont you have 1 more small hose coming from the base of carb going down to the canister ?
Just the one that Ts to the PCV and goes in the bottom of the front of the carb.

This is my 2nd can over the years.
The first OE one was easy too figure out, the Valve on the can that
the TVS opens would not hold vacuum.

My memory is going as well as my skill set.
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