Ok, i am trying to puzzle this one out.
I have a F56 Cooper S 2 door. Almost 160k miles.
Recently, I have noticed, when I fill the tank, and get back in it takes 20 seconds or more to start.
Any other time Day or night after long or short drives it always starts right up.
I have tried not filling it up and it seems to do it 95% of the time.
I have always used 93 octane.
Just this past year switched from Shell to Mobil. as the primary fuel.

Today, i drove it about 40 miles and stopped the car and opened the gas cap for 30 sec, and put it back on. and the car started right up.

so far the only issue happens after putting gas in the tank.

Any Ideas?
thanks,
Roger

 

Yup, the dreaded evap control valve.

https://www.ecstuning.com/b-genuine-...e/13907621174/

Its on top of the valve cover under the plastic shroud.

 

I've had the same issue—fill up with gas, and then there's difficulty starting the car. About 5-10 seconds for me right now. I now have a check engine light with a P0456 code (Evaporative emission (EVAP) system - very small leak detected).

 

Thanks! Sounds like the culprit.

THe picture was extremely helpful too!

Roger

 

Thanks, Exactly what it needed. Replaced, and all is normal again!

Thank you!

Roger

 

I just replaced mine too! But I still have a rough idle - might be my HPFP or maybe my engine needs some walnut blasting.

 

How do you replace that evap control valve? Do you just remove the old one and put in the new one or do I have to depressurize the system or something like that?

 

Its just a vapor line. No fuel resides in there.