Fuel Pump (Gasoline Gensets}
If a problem
in
fuel delivery is indicated (see TROU-
BLESHOOTING
in
this section), test fuel pump
pressure as follows:
1.
Disconnect the fuel line at the outlet
of
the fuel
pump and connect a pressure gauge at the
pump outlet. A gauge calibrated for 0-15 psi
(0-1
00 kPa) is recommended. Do not tee into
the fuel line. This is a static pressure test.
2. Push the Start/Stop switch to START and hold
it there for several seconds until the fuel pres-
sure stabilizes. Fuel pressure should stabilize
between 3.5 and 6 psi (24 and
41
kPa).
3. Repeat the test with the vehicle engine run-
ning.
A
fuel
pressure
greater
than
6
psi
(41
kPa)
is
not
acceptable.
Find out why the pressure is high. If it is
high when the vehicle engine is not running, check
to see that the proper Onan supplied pump is being
used. If it is high when the vehicle engine is running,
6-28
a separate fuel pickup tube
in
the fuel tank, or
equivalent means, will be required.
If the fuel pressure is less than 3.5 psi (24 kPa),
check for fuel restrictions in the system. If the pump
is defective, replace it with the appropriate Onan
pump. The pump is not serviceable.
lA
CAUTION! Tampering with the seal
at
the cen-
ter
of
the
mounting
bracket
on
the side
of
the
pump
can cause the
dry
gas
which
surrounds
the electrical components to leak* leading
to
pump
failure. The
pump
is
not
serviceable.
IAWARNINGl
Do
not
substitute an automotive
fuel
pump
for
the standard
pump
removed from
the
genset. Other
pumps
can cause carburetor
flooding
because
of
the
high
pressures
they
de-
velop. Carburetor flooding can cause
poor
per-
formance
and
engine damage
and
lead
to
pos-
sible
fire
and
severe
personal
injury
or
death.
Fuel
pressure
at
the carburetor
fitting
must
not
exceed 6
psi
(41
kPa)
under
any
operating con-
dition.
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