full tank of gas = pig rich idle?

[scottiedawg66]

My wideband goes off the chart on the rich side for the first 15 miles or so every time i get a full tank of gas, and come down to idle. Any ideas on what this is caused by, after a few miles problem goes away, and i sit right around 14.7 at idle? Stock fuel pump, and no AFPR, I do have 550s and lexus, but they seem to be running as expected without a piggy back. ONce i get the tool ill post my base fuel pressure. :wtf:

~scott

 

[Shawndude]

The charcoal cannister is purging the gas tank fumes. Perfectly normal and nothing to worry about.

Its a very minor amount, that's why you only see it during idle, when there is almost no air coming into the engine.

 

[scottiedawg66]

I dont have a charcoal canister. And its far from normal and OK, by car sputters and dies out if i dont help it. Its real embarrasing to stall when ur pulling out of the gas station.

~scott

 

[scottiedawg66]

wow, once again im real stupid. Time for a vented gas cap.

~scott