Joined: Sep 2021

Posts: 360

Likes: 59

I did an EVAP check, I thought something was wrong with the canister or the valve near the canister. On my ‘91 the canister has a vent and a sponge filter at the top. If you blow / suck air through any of the tubes it will go through the vent, charcoal particles can escape this way which is not good. The vent is at the top. Then there is the TPCV between the canister and the fuel tank. I can suck air and there is a lathe amount of vapours of gas present. So this indicates the line to the tank is not clogged. Then FSM says you can blow through the tank side of the valve to check how much pressure it hold. I holds a little pressure, it’s easy to blow although there is pressure buildup (takes like 5s to release when the cap is slightly released and car well warmed up 105C) when I open the tank cap but obviously it can’t higher than what the valve can hold. The FPCV has a tube at the top that when vacuum is applied it would release pressure from the fuel tank sooner but I don’t see how you can build up vacuum with the canister vented to the atmosphere 🤔 unless there is some fuel inside which slightly restricts the flow.
Anyway this part of the system seems normal to me.
The problem I think is with the solenoid. If I pull off the electrical connector when the engine is running there is vacuum at the canister side tube. There is the same amount of vacuum with the connector plugged in and 14V present at the connector between the pins.
Does that mean the solenoid is stuck in the on position?