140
FUEL SYSTEM
FUEL SYSTEM TESTS
Pressure Regulator Test
Refer to Vapor Sep arator Service on p. 146 to
remove vapor separator.
Make su re filter is no t clogg ed. Clean or r eplace
as needed.
Apply oil to valve and connect pressure pump and
hose to the fuel return fitting of vapor separator.
Apply pressure to ch eck regulator ope ration. The
pressure sh ould open check valve at a pproxi-
mately 15 psi (103 kPa).
Vapor Separator Vent Check
Monitor the vapor separator vent hose. No fuel or
a trace of fuel is accep table. Exce ssive fuel dis-
charge indicates a vapor separator vent malfunc-
tion. Monitor vent f or presence of fuel during
testing. Temporarily install cle ar tubing for mon i-
toring. Replace vapor sep arator if th e ve nting of
fuel is continuous.
Fuel Injector Pressure Test
This te st re quires Inj ector T est Fi tting ki t,
P/N 5005844.
Disconnect the battery cables at the battery.
Relieve fuel system pressure. See Relieving Fuel
System Pressure on p. 143.
IMPORTANT: Perform test with in jector
mounted to cylinde r h ead and fittin gs 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 inje ctor to 30 psi
(207 kPa). Pressure must h old f or at least five
minutes.
Refer to FUEL DE LIVERY TESTS on p. 85 for
additional test procedures.
1. Filter
2. Fuel return fitting
3. Pressure regulator
000249
A WARNING
Protect aga inst hazardous fuel s pray.
Before st arting any fuel syste m service,
carefully relieve fuel system pressure.
1. Outlet fitting
2. Inlet fitting
002379
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