Checking Fuel Tank And Vent; Replacing Fuel Line And Grommet - Bosch PB-650 Service Manual

22

4-5 Checking fuel tank and vent

(B)
2K194A

4-6 Replacing fuel line and grommet

(B)
(b)
(a)
2K472
FUEL SYSTEM
(A)
(C)
(D)
(A)
1. Disconnect black fuel line from carburetor and
connect pressure tester 897803-30131 to fuel line
with an appropriate joint.
2. Pinch vent pipe (A) to block the air passage, and
apply 0.1 kgf/cm 2 (1.5 psi) of pressure.
3. The pressure should not drop. If the pressure
drops, leakage may be occurring from fuel cap gas-
ket, fuel tank, fuel line, grommet or vent line. Check
them and replace defective parts with new ones.
4. Release the vent pipe. The pressure should stay
at or above 0.1 kgf/cm 2 (1.5 psi). If pressure drops,
vent or vent pipe is defective.
5. To check vent, remove vent, and connect pres-
sure tester to vent (B).
6. Apply 0.5 kgf/cm 2 (7.0 psi) and check if the pres-
sure stays between 0.1 to 0.4 kgf/cm
psi).
7. If the pressure is out of range, clean vent gently
with compressed air or replace with a new vent as-
sembly.
1. Disconnect fuel pipes from carburetor.
2. Remove grommet with pipes from fuel tank. Pull
off fuel strainer from the end of pipe (A).
3. Pull out defective pipe (A) and pipe (B) from
grommet and pull out pipe (C) from pipe joint (D)
(and remove pipe joint (D) from grommet, if pipe
joint is defective).
4. Insert new pipe as follows:
(A)
Black
Pipe
(Strainer)
Length mm 230
(inch) (9.06)
Distance (a)
mm 99~ 101
(inch) (3.90 ~3.98) (4.10 ~ 4.17)
PB-650
PB-750
2
(1.5 to 5.5
(B) (C)
Trans-
Black
parent
(Vent)
(Return)
145 145
(5.71) (5.71)
(b)
104~ 106 ---
(continued)