Fuel Supply System
Fuel supply system components, removing and installingEvaporative emissions system, servicing
A new EVAP canister purge regulator valve has been introduced for the Evaporative emissions system, 08.95 -->.
The valve is black and normally closed.
Fuel tank breather, checking
Special tools, testers and auxiliary items
^ Hand vacuum pump US 8026
Test conditions
^ Ignition switched off
Test sequence
- Remove Air Cleaner, Repair Group 24
Vehicles --> 07.95 (blue valve)
- Remove purge hose -1- from EVAP canister purge regulator valve -6- at throttle body -2- and install hand vacuum pump US 8026 to hose.
Vehicles 08.95 --> (black valve, OBDII)
- Remove purge hose from EVAP canister -4- at purge regulator valve -6- and install hand vacuum pump US 8026 to hose.
All Vehicles -->
- Disconnect breather hose -3- (from fuel tank) at EVAP canister -4- and plug port on canister.
- Operate hand vacuum pump US 8026 several times
^ Vacuum must not build
If vacuum builds-up
- Check breather connection -5- on EVAP canister -4- for contamination, clean as necessary
- Remove plug from canister port
- Check EVAP canister purge regulator valve -6-for continuity, replace if necessary (Vehicles 07.95 blue valve only)
If vacuum does not build-up
- Remove fuel filler cap
- Connect hand vacuum pump US 8026 to breather hose -3- from fuel tank (previously removed from EVAP canister -4-)
- Operate hand vacuum pump US 8026 several times
^ Vacuum must not build up
If vacuum builds-up
- Check gravity valve --> Page 20-5, item 28
- Check line -3- (from fuel tank) for blockage
If vacuum does not build-up
- Re-install fuel filler cap
- Operate hand vacuum pump US 8026 several times
^ Vacuum must not build up
Note
If the fuel level is low it will take much longer to build a vacuum, the vacuum pump must be operated at least 20...30 times.
If vacuum builds-up
- Replace fuel tank cap