charcoal canister to intake hose question

[azn2nr]

if the line that goes to a valve and then to the charcoal canister is disconnected at the valve will mpg's suffer in an emense way. ive been getting about 10 mpg this week and when i looked my line was disconected.

[BAC5.2]

Yea, that returns evaporated fuel to the engine for re-burning, instead of being wasted to the atmosphere. I am pretty sure that's what it does...

Connect it back up.

[vrg3]

http://www.graphics.cornell.edu/~v/vacuum/

Are you talking about hoses P and Q? Which one was disconnected?

[azn2nr]

q was disconnected

[vrg3]

So you had a small intake leak, and had the canister open to atmosphere when on boost.

That shouldn't have made a huuuge difference in mileage, but it would have made some difference. It could adversely affect driveability too.

[azn2nr]

driveabilty was excelent. no idle problem or anything. in fact traction was the only issue this last week