Hello,

I am currently getting about 10 miles per gallon due to the canister leaking. I cannot find the switch for the return valve. It appears as if the lines lead up into the back of the backseat/ trunk of the car. I found the canister, but need to find the valve because that is where the problem is. Any help would be greatly appreciated!!

Thank you in advance,

 

Anjelah:


You are mixing apples and pears. There are two systems, but somewhat related.


1. Engine fueling. Because of the two tank system, a bit complex. The fuel pump in the boot delivers fuel from he selected tank via a valve in the boot. the regulator on the fuel rail returns the excess fuel to the selected tank. Valving again.


2. Vapor control. an emission thing. In olden days, tanks were vented to the atmosphere. No longer PC. Now a complex piping system allows the vapors to go forward. The charcoal filled canister is there to absorb them. And the engine has a purge system to draw off vapor via vacuum and burn it harmlessly. Now, if anything in the system goes wrong, the charcoal becomes super saturated and ineffective and may leak.


A. Open a line at the canister and see if it is clear back to the tanks.
B. Examine the one way valve at the canister. some just puncture it and make t open all the time.


C: run the engine and see if the purge system is working.


D; Replace the canister or cut it open and replace the super saturated charcoal.


GM used the same system. Cannister and purge.


Carl

 

the one way plastic check valve is not at the canister, but about 2½ feet away from it.

regardless, puncturing the check valve is only needed if your tanks are expanding and contracting due to fuel vapors building up and not exiting the evaporative system, for example if when you open the gas filler cap, a whooosshh of gasoline vapor comes out and you can hear the tank contracting back into shape.

 

Thanks Carl! I checked to see if the line was clear, however, did not check the charcoal in the canister, or any others you mentioned. How do you open it, and where would I buy more charcoal?

THANKS A BUNCH!!

 

Thank you Jose. The tank is not holding vapors.