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You have only determined that the solinoid pintle is working..you have not determined if the flow is correct.
Take the vac hose going to the canister off when the vavle is pulsing and put you finger on the port of the valve..does it have pulsing suction??

If yes, then unplug the connector..does the valve shut OFF ?
If NO to either , it is full of crap and needs to be cleaned.
That is why my early post said to check flow.

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A Dalton