what is the DTC number

 

So finally got around to completing job, before putting canister pipe back on filter went under bonnet disconnected line from canister to valve and connected a vacuum pump and pumped,! got around a pint of fuel out then nothing, reconnected all canister lines and started car, no leaks no splutters back in action

 

Thanks for the info: you will be sucking a lot of vapor for awhile through the underhood solenoid as the ECU opens the EVAP system to purge vapors. That may effect the car throttle response until the canister settles back to normal.

 

P0453 stands for “Evaporative Emission System Pressure Sensor/Switch High

Considering I rebuilt the fuel system under the tank, checked the canister valve, replaced the purge valve, and have a new gas cap that means there has to be a leak somewhere when the system is put under vacuum. This is the same code that I eventually figured out I was having hesitation issues as listed in this thread:
https://www.crossfireforum.org/forum...eleration.html

Now the car drives great with no hesitations.

I might replace the hose that goes from the purge valve to the hard line that runs under the car.

 

You need to look that code up in the service manual. It refers to the senor inside the gas tank, so it could be bad wiring from the top of the tank to the PTCM or a bad sensor. A stuck purge solenoid can cause the code to trip but the DTC refers to the sensor not the EVAP system. I do not know what scan tool you are using, but if it is a generic OBD tool it may be giving you a false DTC. It is best practice to scan with a tool that can get into the Mercedes codes on the Crossfire.

Are you having any trouble filling the gas tank ?

This has to be frustrating; Hang in there.