The purge valve is open while the engine is running, closed while the engine is off.
When refilling the fuel tank, gasoline vapors are pushed through the vapor canister, this is normal. If the purge valve is stuck open, gasoline vapors can be forced into the intake manifold, this causes hard starting (flooding).
Do you top it off when fueling/filling up, or return the nozzle once it clicks and the pump stops pumping??
Iāve tried both ways same outcome.
I seen on YouTube a way to test the purge is to remove the line coming out of purge valve and start up. It should not be sucking air till it warms up. I did that. When I first put my finger on it I felt it have some vacuum for a second then there was none.
If I were to remove that line after a fill up would it start normal Like that? Would that be a good test to see if itās bad?
You remove the hose, and plug the hose and the connection where the hose was removed before filling the tank.
Now thereās no way for gas vapors to be forced into the engine while filling the tank, preventing the flooded condition.
Tester
Ok. So unplug the line. And plug up both ends. The end of the purge valve and the end of the hose. If itās the problem it will start up good after filled. Will do in a week or so. Thanks.
Be cautious with this sort of diyāer experimentation w/the fuel system. Gas vapors wafting around the engine compartment can be dangerous.
I put a new MAF and Purge. Ran great. Filled tank up as much as I could. Started up nice. Was idling so quite I thought it didnāt start. Drove off slowly ran perfect.
From now on stop at the first click.
You canāt pack the gas tank to the point where it damages the carbon canister.
The Onboard Refueling Vapor Recovery system has a ROOF (roll-over/over-fueling) valve that prevents that from happening.
These are the components in the ORVR system.
The vapors which are displaced from the fuel tank by the incoming fuel are routed via the vapor vent line to the canister and are absorbed by activated carbon. These canisters are made of either steel or plastic. The size of this canister is tailored to accommodate expected evaporative emissions. The emissions occur throughout the day, even when the vehicle is parked.[8]
The fuel tank filler pipe has a seal, either mechanical or liquid, to stop vapors from escaping the filler tube. A mechanical seal is usually an annular elastomeric material through which the nozzle must pass during refueling, preventing vapors from escaping alongside the nozzle. A liquid seal is created by the design of the filler pipe, which creates a seal with the liquid flowing into the tank. Since the liquid fills the entire pipe, no vapors can escape during refueling. A liquid seal is usually used for smaller vehicles, while the mechanical seal is used for larger vehicles.
The vent line is a tube that routes vapors from the fuel tank to the vapor storage device. [8][dead link]
The vapor purge line directs vapors from the vapor storage device to the engine to be burned, to purge the vapor storage device.
The purge valve controls the purge vapor purge line, through which the manifold vacuum pulls air through the vapor storage device and purges it of fuel vapors. The electronic control unit (ECU) controls the opening and closing of this valve.[8][dead link]
The anti-spitback valve prevents spilling of vapors and is located in the fillneck.[8][dead link]
The fuel tank necessarily contains fuel vapors (occupying all the space which is not occupied by fuel). These are the vapors that must be contained so they do not escape into the atmosphere.[8][dead link]
The vent/rollover valve provides a method of controlled escape for gasoline vapors during the refueling process. It has a mechanism which closes the vent in the event the vehicle rolls over, to prevent spilling of VOCs or fuel in general. It also acts as a fill limiter
Tester
I did it to test to know without doubt it was the problem. I typically stop after it automatically clicks off.