I have a 1999 E320 4matic. I keep getting these 2 codes. I have repaired 2 wires to the tank pressure valve due to excessive resistance. The purge vent valve was replaced and the power and signal wire to the pcm are good. I am confused because it will always would occur on the second start immediately. I thought this would only be activated under driving at higher speeds. I see no pump for the tank. I cant identify which line to the charcoal canister are the vacuum line. Any one have any ideas. How would I check the vacuum system to the canister as per the repair sheet. It meets all the voltage requirments.

 

[QUOTE=Jim Erlichman;168125]I have a 1999 E320 4matic. I keep getting these 2 codes. I have repaired 2 wires to the tank pressure valve due to excessive resistance. The purge vent valve was replaced and the power and signal wire to the pcm are good. I am confused because it will always would occur on the second start immediately. I thought this would only be activated under driving at higher speeds. I see no pump for the tank. I cant identify which line to the charcoal canister are the vacuum line. Any one have any ideas. How would I check the vacuum system to the canister as per the repair sheet. It meets all the voltage requirments.[/QUOTE

Copy link into your browser this guy talks about replacing purge valve but will also point out vacuum lines.