Fuel Tank And Vent Control Valve Test 10F; Fuel Tank And Vent Control Valve Test 13F - Subaru Forester Technicians Reference Booklet

2
000 Model Year Evaporative System Diagnosis

Fuel Tank and Vent Control Valve Test 10F

Fuel Tank and Vent Control Valve Test 10F Fuel Tank and Vent Control Valve Test 10F
Fuel Tank and Vent Control Valve Test 10F Fuel Tank and Vent Control Valve Test 10F
(10F) Check all fuel lines, fuel cap and
Evaporative lines for proper connection.
(10F1) Remove all fuel and tank pressure.
(10F2) Follow instructions in the appropriate
Subaru service manual for removing the
fuel tank
(10F3) Plug all inlets and outlets from the fuel
tank and external valves.
(10F4) Ensure fuel tank is at least half full and
pressurize.
(10F5) After leak has been found and repaired go
to (10F6)
(10F6) Pressurize.
WARNING: Next step introduces fuel vapors into
the atmosphere.
(10F7) After 2 minutes, does pressure hold?
YES – go to step (10F8).
NO – Recheck for leaks and go to (10F5)
(10F8) The following steps will check the
operation of the vent control valve.
This should be performed before installing the tank
because the tank must be removed to replace a
faulty valve.
Steps (10F9) through (10F11) will test the
mechanical operation of the Vent control valve.
(10F9) Listen to the sound of air leaving the tank
as plug for F-11 is removed.
(10F10) Listen to the sound of air leaving the tank
as plug for V-2 is disconnected.
(10F11) Did the speed of air escaping the tank
increase from steps (10F9) to (10F10)?
YES, Remove all fuel and tank pressure
and install tank-using instructions from
the appropriate Subaru service manual.
NO, Remove all fuel and tank pressure
and replace Vent control valve using
instructions from the appropriate Subaru
service manual.
If tank has been removed, perform step 1 through
13 to confirm air tightness of fuel tank and vent
control valve after installation.

Fuel Tank and Vent Control Valve Test 13F

Fuel Tank and Vent Control Valve Test 13F Fuel Tank and Vent Control Valve Test 13F
Fuel Tank and Vent Control Valve Test 13F Fuel Tank and Vent Control Valve Test 13F
(13F) Remove all tank pressure.
(13F1) Remove V-7 from fuel neck and connect
PT-1.
(13F3) Remove V-2 from vent control valve.
(13F4) Pressurize
Did pressure hold?
YES , replace or remove obstruction from
rubber hose V-7 through V-2 and go to
step 7.
NO , go to (13F5)
(13F5) Insert ST Plug into V-2 hose.
(13F6) Pressurize
Did pressure hold?
YES , Remove all fuel and tank pressure
and replace Vent control valve using
instructions from the appropriate Subaru
service manual.
NO , replace rubber hose V-7 through V-
2 and go to step 7.
If tank has been removed perform step 1 through
13 to confirm air tightness of fuel tank and vent
control valve after installation.
29 Effective 09-25-03