Cel po496
Thread Starter
Senior Member
Joined: 12-26-2009
Posts: 819
From: Hebron, Ill.
Thanks for the help
Thread Starter
Senior Member
Joined: 12-26-2009
Posts: 819
From: Hebron, Ill.
Check the canister area under the rear of the SS, have changed the fuel cap ?
https://www.obd-codes.com/p0455
https://www.obd-codes.com/p0455
Moderator
Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
But you didn't change the vent valve. If it is not the vent valve it may be something not installed correctly in the tank.
On SS there is a check valve in the purge tube to prevent boost from pressurizing the system. This makes pressure testing the EVAP a bit of a challenge.
The test is run by opening the purge valve and closing the vent valve thus creating an expected vacuum in the tank in a specified time. That narrows the point of failure to a hole in the tank or a faulty valve.
On SS there is a check valve in the purge tube to prevent boost from pressurizing the system. This makes pressure testing the EVAP a bit of a challenge.
The test is run by opening the purge valve and closing the vent valve thus creating an expected vacuum in the tank in a specified time. That narrows the point of failure to a hole in the tank or a faulty valve.
Thread Starter
Senior Member
Joined: 12-26-2009
Posts: 819
From: Hebron, Ill.
But you didn't change the vent valve. If it is not the vent valve it may be something not installed correctly in the tank.
On SS there is a check valve in the purge tube to prevent boost from pressurizing the system. This makes pressure testing the EVAP a bit of a challenge.
The test is run by opening the purge valve and closing the vent valve thus creating an expected vacuum in the tank in a specified time. That narrows the point of failure to a hole in the tank or a faulty valve.
On SS there is a check valve in the purge tube to prevent boost from pressurizing the system. This makes pressure testing the EVAP a bit of a challenge.
The test is run by opening the purge valve and closing the vent valve thus creating an expected vacuum in the tank in a specified time. That narrows the point of failure to a hole in the tank or a faulty valve.
The purge valve is new. I could put in a new vent valve. They are only $25. I did see the check valve you mentioned on top of the motor.
Thanks
Moderator
Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
There is either a restriction in the purge path or the FTP (fuel tank pressure sensor) is not working correctly or a leak in the fuel tank or the seal on the new vent valve is faulty.
What it means is when the purge valve is trying to create vacuum in the tank it is either failing to or the FTP is malfunctioning. Could be The fuel pump was replaced and not sealed properly or any of the sensors on the tank.
What it means is when the purge valve is trying to create vacuum in the tank it is either failing to or the FTP is malfunctioning. Could be The fuel pump was replaced and not sealed properly or any of the sensors on the tank.