145
Fuel System
Fuel System Tests
7
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. 175.
Relieve fuel system pressure. Refer to Relieving
Fuel System Pressure on p. 148.
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. 90 for addi-
tional test procedures.
Fuel Injector Resistance Test
Disconnect the battery cables at the battery.
1. Filter
2. Fuel return fitting
3. Pressure regulator
010350
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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