Originally Posted by dannn

my post from original thread:

that stuff is true.
when you are filling a tank the air inside is getting displaced by the liquid fuel coming in. the epa is starting to get real strict on evaporative emissions (emissions that come from fuel evaporating into the atmosphere) so gas pumps have a system that will recover these vapors as they are being pushed out of the fill neck.

when the temp rises in the gas tank the pressure goes up and some of the gas turns into vapor state. back in the day the gas cap was designed to relieve the pressure (along with the fuel vapors to be vented into the atmosphere)

now it is required that cars have a vapor recovery system. this is what the charcol canister or sometimes called evap canister is for. it stores the vapor and releases them into the intake manifold at a time the system determines as proper to be burned as fuel.

also if fuel in liquid state reaches this charcol canister the charcol pellets will get saturated and will not be able to store vapors anymore and this will cause the car to fail emissions during an inspection. this is why they say over filling can damage your evap system. you cannot just replace the pellets, you will need to replace anything that the fuel has damaged in order for the system to work properly again.

if you take an old car like from the 60's and left it in a garage it will give off more emissions just staying there (not running) than a modern car idling in the same place.



im doing a write up on emissions system and will be posting it in the technical chat section.

Originally Posted by snotz

I have the same problem

My old 06 LX gets about 650 kms, even if i drive it hard. Now my 09 LX-s is only around 500 kms. I don't know why but it's the same engine.. except my 09 is a 4dr.