Code P04F0 issue

[EdgeWis713]

I've had a Code: P04F0 - EVAP System High Load Purge Line 'A' Performance for a while now, on and off since January 2026.

 

I have a vLinker FS in the OBD port at all times and use FORScan Lite on my phone. This is on a 2022 Edge SEL.

 

Initially, I traced it to a faulty purge valve, so I replaced it with the whole hose & purge valve assembly mid-February and the check engine light went away, for a whole 2 months (approximately).

 

Mid-April the check engine light came back, same code, so I bought just the Purge Valve and replaced it, even though it didn't seem like the old (new) one was bad, then cleared the code and everything was fine, for a couple of weeks anyway, then the check engine light was back. A bunch of research later and I went to the next possible part and replaced the Vapor Canister Vent Solenoid in May. Unfortunately, that still didn't fix anything so I broke down and bought a smoke machine. I ran a test through the gas cap and found the smoke leaking from only one place, the top drivers side of the gas tank.

 

I have not dropped the tank yet as I don't have a lift and I'm not sure how to go about it in my driveway. The question is, could this possibly be something simple like the seal on the drivers side fuel pump is bad or could it be something more nefarious?

 

I've also noticed that the code doesn't show up when the gas tank is between 3/4 - full, only once it's below 3/4 does the code appear and pretty much every time I start the car.

 

Any ideas? I'm getting pretty tired of having to clear code anytime I get in the car.

 

Thanks,

-Trevor

Edited 1 hour ago by EdgeWis713

[1004ron]

Welcome.

 

On the purge valve - I've followed a similar path, replaced the complete assembly with a 3rd party brand, replaced just the solenoid and both had a very short life - I'm on an OEM one for about 7 months with no issues.