Onan MJA Series Service Manual page 33

31
,J.
FUEL SYSTEM
6. Remove the rocker arm, spring and link.
7. Lift out the diaphragm assembly and diaphragm spring.
3.2.3.3 Repair ... Fuel pump failure is usually due to a leaking dia ­
phragm, valve or valve gasket. A kit is available for replacement of
these parts. Because the extent of wear cannot be detected by the eye,
replace all parts in the kit.
If
the is broken or leaks, check
for diluted crankcase oiL
Occasionally, failure is due to a broken or weak .spring or wear in the
linkage. In this case, replace the worn parts or install a new pump.
3.2.3.4 Assembly, Fuel Pump ...
1. When installing a new diaphragm, soak it in fuel before assembling,
Insert the diaphragm spring and soaked diaphragm into the pump
body.
2. Insert the link and rocker arm into the body, hook it over the
dia-'
phragm pull rod. Align the rocker arm with the rocker arm pin
hole and drive in the pin.
3. Compress the rocker spring and install between the body and rock ­
er arm.
VALVE AND CAGE
A687
ASSEMBLIES
FIG 3.2.D .. CROSS SECTION, FUEL PUMP