Check engine light with code P0456?

ANDYEHELER

MEMBER
2008 FORD MUSTANG
4.0L
V6
2WD
AUTOMATIC
99,000 MILES

CEL throwing a P0456 (very small Evap leak). I changed the purge valve already and the gas cap. I ran my smoke machine to the evap line heading towards the fuel tank and gas cap. The problem I'm seeing is that the smoke seems to be coming out of the chassis itself. Like the mounting holes, etc. I'm wondering if the vent tube vents into the chassis, but I'm having no luck finding that info online. It's making it really difficult to find smoke from the actual leaking valve or hose, etc. If it vents into the chassis, is there a Forscan function or similar that can close the vent so I can actually have a chance at seeing the leak? I can take a video/pic when it stops raining if need be. Thank you.

Sunday, July 7th, 2024 AT 11:17 AM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,055 POSTS

Hi,

There aren't any evap hoses that run through the vehicle. I'm not sure where you are seeing it. If possible, take a few pictures of the location and upload it for me to see.

Also, I attached the vacuum schematic for the EVAP system below. See if you can determine (based on where you see the leak on the vehicle) what hose it could be.

Let me know.

Joe

See pics below. Note: Pic 2 is the parts legend for pic 1.

Images (Click to make bigger)