Update:
Canister is not heavy, no fuel or contaminants came out. Fairly easy to blow through all 3 ports

​​​​​Plugged 2 ports and blew into the canister and it held pressure, no hissing or leaks.


When we blow into the hose to the tank, air comes out the filler hole (with gas cap open)

When blowing into hose to tank with lid closed, air builds up pressure, when removing lips, air blows back.
So it seems unrestricted. It gets harder to blow as the tank expands ofcourse.


The cansiter solonoid won't open with a 9v battery but it will with 12 volts.

 

Update #2:
computer is sending 8.52 volts to the rear canister solonoid.
So that means this solonoid won't open without 12 volts... It's not a AC Delco, it's a China special.

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Then you have a dead battery. It is supposed to be full battery voltage. A dea battery is anything below 12.4Volts, the computers won't run on less than 9volts.

 

Ok I didn't test it running. The battery with engine off is showing 11.8 volts

The harness is showing 8.52 volts with key forward (not started)

 

Ok with car running in getting 11.8 volts out of the harness.
When I plug the harness back in, tank purge solonoid is not clicking closed.

 

So I disconnected the harness again, added power from a battery I have. It then clicks and for the first time ever, the tank began building pressure.
when I removed the cap, the tank sucked in air.
The tank went from -12mm/hg up to -8mm/hg.

So there appears to be no blockages to the tank, in the canister, or the line running to the engine.

What gets me is the power commanding the solonoid to close.. is that where my issue is? It doesn't quite reach 12 volts and the solonoid isn't clicking on when connected to the harness... Only off my external battery.

Car is still running rough and missfiring .

 

Still a dead battery. The computer does not regulate the 12 volt output. I guess it is possible there is a draw somewhere, but I doubt it.
Battery with engine off should be around 12.9 volts. Engine running it should measure about 13.5 Volts but it varies with demand.

 

You need a battery.

 

So with the car running I'm getting around 14.4 volts
I was able to find the commands to turn on and off the solonoids with my scanner.
When I seal the system, it pressurizes and car starts to stumble as it does. When I command it to vent, I can hear the vent open and it drops. The tank voltage is raising and lowering with the pressure as it should too. Only by a volt but I didn't know how much to pressurize the system

So there does not appear to be any blockages as we blew air through the lines. To tank and to engine.
And there seems to be no leak as it builds pressure at least tank side.

Only way I ever hear that solonoid on the canister click is when I command it too using the scanner connected to the cars computer....


​​​​​​I did have all the doors and lights on for a while, while disconnecting everything so I may have run the battery down too.

So where do I go from here?
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Recharge your battery