142
FUEL SYSTEM
FUEL SYSTEM TESTS
Pressure Regulator Test
Refer to Vapor Separator Service on p. 148 to
remove vapor separator.
Make sure filter is not clogged. Clean or replace
as needed.
Apply oil to valve and connect pressure pump and
hose to the fuel return fitting of vapor separator.
Apply pressure to check regulator operation. The
pressure should open check valve at approxi-
mately 15 psi (103 kPa).
Vapor Separator Vent Check
Monitor the vapor separator vent hose. No fuel or
a trace of fuel is acceptable. Excessive fuel dis-
charge indicates a vapor separator vent malfunc-
tion. Monitor vent for presence of fuel during
testing. Temporarily install clear tubing for moni-
toring. Replace vapor separator if the venting of
fuel is continuous.
Fuel Injector Pressure Test
This test requires Injector Test Fitting kit,
P/N 5005844.
Disconnect the battery cables at the battery.
Loosen oil tank assembly to provide access to fuel
manifolds. Refer to Oil Tank Assembly on p. 173.
Relieve fuel system pressure. Refer to Relieving
Fuel System Pressure on p. 146.
IMPORTANT: Perform test with injector
mounted to cylinder head and fittings installed
with manifold retainer.
Use cap and tie strap to seal off outlet fitting. Con-
nect a 0 to 30 psi (0 to 207 kPa) pressure tester to
the inlet fitting. Pressurize the injector to 30 psi
(207 kPa). Pressure must hold for at least five
minutes.
Refer to FUEL DELIVERY TESTS on p. 88 for
additional test procedures.
1. Filter
2. Fuel return fitting
3. Pressure regulator
000249r
A WARNING
Protect against hazardous fuel spray.
Before starting any fuel system service,
carefully relieve fuel system pressure.
1. Outlet fitting
2. Inlet fitting
002379
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