1st Gen R50 Cooper Most liked posts in thread: Engine stalling after gas fillup

Clogged gas tank breather?

 

I top off too, have not had a problem when doing so. Last fill was darn close to 14 gallons in the supposed 13 gallon tank.

 

Hopefully the gas cap does it...
Kinda wonder if the "purge valve"...not sure the technical name...but it helps to draw a vacuum on the tank is bad...maybe letting fuel get sucked into places it should not be going...the MINI part is $$$..but I remember reading that it is actually a generic part used on MANY cars....just happens to be sold by MINI, but not cross referenced by non-MINI parts places as fitting......
If the cap does not do it for ya..let me know...I'll look for the lthread over on NAM.

 

I'd think if it was a clogged breather it would happen before the fill up. As the fuel was used it would starve for fuel. Had this happen on another car. If it was that when the cap was opened the pressure would equalize & run fine until it built up pressure again.

Does the tank go woosh when you remove the cap?

 

Do you top off the tank or stop filling as soon as the nozzle first shuts off?

 

Does you MINI have any codes stored?

 

I top mine off when I fill up and get every last drop in I can. I know you are not supposed to but I have never had a problem.

It may have to do with the breather but you could also be getting bad or watered down fuel.

Try adding a bottle of Chevron Techtron for a 20 gallon tank and fill you next take with 93 octane fuel from Shell or Sunoco. Maybe you have varnish built up in the fuel system that needs to be cleaned out. It may take 2 or more tanks of 93 and techtron to clean everything up.

It could also be a MAP or T-MAP sensor going bad but try the fuel treatments first since they are the cheapest and you always need fuel.

One more thing it could be is an O2 sensor since everything is warmed up and you shut off the car. When the ECU resets the O2 is already warmed up and it's trying to adjust everything which could cause what you are feeling. That did happen to me before and after I checked everything I replaced the O2 everything was right again.

Good luck let us know how you make out.

 

Yea, you should never top off as it will damage the carbon canister and it can effect performance.

 

Never had a problem and have been doing it for 8 years.

 

Yes if you keep clicking to get to the next even dollar. Letting it click one more time is not going to harm anything. At least that has been my experience. Your mileage may vary.

 

93 is all that goes in my tank. I top off to the nearest $0.50 and never have a problem.

 

if no 93 then get the highest grade you can and put it in there.

 

I've been guilty of adding 14 gallons to the 13 gallon tank as well. No problems with it. However in the Jeep, if you fill it to the top of the neck, you better be burning it off fairly quick... It sets off a gas cap warning, and will keep it on until you shoot the inside of the cap with some WD-40.

 

Is the tank on the red light close to empty? I used to get something like this with the Subaru. I figured either there was something in the tank or air got sucked up? So I filled up on 1/4 tank to fix the issue.