“I really hope that I don’t still have a rich mixture problem. I did have a CEL of rich mixture a few months ago, but after replacing front O2 sensor and MAF it went away. I have also done a stage 0 tune and just about everything else that could fix a rich mixture problem. The only thing it might be is the injectors, but that sounds unlikely.
Just to minimize confusion, I have made this diagram to show how the system is connected. The hoses circled in purple are the ones I hooked together, providing the FPR with vacuum. I got at LEAST 50-60% better MPG after doing this. The slashed lines are fuel lines. I can’t believe I finally achieved great MPG by accident, only to discover it’s a false hope. Bummer.”
Where IS the charcoal canister on your car? Though we have a similar model, I think we may have a different emissions system, which is why I was hesitant to comment on any of your posts before.
But is it safe to run like that?
Permanently, no. The EVAP system serves to let off the fumes from the gas tank that build up. I’m rather surprised you haven’t got a code for it before.
I left a gas can with the caps on once in the summer sun after filling it and deciding I’d mow the lawn the next day, and I guess it swelled up and burst. The charcoal canister/purge valve are to let the fumes out of your gas tank that build up in the heat, or in keeping fuel sealed in there.”