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Honour Check Valve
This component is used on all Jeep vehicles. The roll
over check valve prevents fuel flow from the fuel tank
through the vent hoses in the event of vehicle rollover.
The check valve consists of a plunger and a stainless
steel ball (figs. 1J-9 and 1J-10).When inverted, the stain
less steel ball pushes the plunger against its seat. A
properly functioning rollover valve will hold 3 psi (21
kPa) of air pressure on the inlet side when inverted.
VAPOR
INLET
COVER
STAINLESS
STEEL BALL
CJ ONLY
VAPOR
OUTLET
HOUSING
60277A
Rg. 1J-9 Rollover Check Valve—CJ Vehldes
PLUNGER
SPRING
CHER-WAG-TRUCK
60277B
Rg. U-1C Rollover Check Valve—Cherokee-Wagoneer-Track Vehldes
FUEL SYSTEMS
U-7
Carburetor External Bowl Vent
This component is used on all carburetors. The carbu
retor external bowl vent provides an outlet for fuel va
por when the engine is not operating (fig. U-ll). If the
vent were not provided, raw fuel vapor would enter the
atmosphere. Some would also enter the intake manifold
and cause difficult hot restarts. When the engine is
operating, the fuel bowl must be vented to the inside of
the air cleaner for proper fuel flow. This is accomplished
by automatically closing the external bowl vent by a
mechanical link from the throttle. Refer to Float Circuit
in the applicable carburetor section for specific oper
ating principles.
VENT TO
CANISTER
PRESSURE
RELIEF WIPER
VENT VALVE IN
OPEN POSITION -
THROTTLE CLOSED
LINK
80267
Fig. 1J-11 External Bowl Vent—Typical
Fad Vepor Control Integrity Test
NOTE: This procedure is for six- and eight-cylinder
engines only.
(1) If a manometer is not available, one may be
fabricated (fig. U-12).
(a) Attach a 6-foot length of 3/8-inch clearplas
tic tubing (Tygon or equivalent) to a 4-foot x 6-inch x 1-
inch board.
(b) Fill tube with water to a heightof 15 inches.
(2) Visually inspect fuel vapor control system for
loose or damaged hoses, clamps, etc. Repair as
necessary.
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Troubleshooting
