Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
FUEL PUMP
Before proceeding to the pressure test ensure the
battery is fully charged. Battery voltage must be
over 12 volts.
Release the fuel pressure in the system using
B.U.D.S. Look in the Activation tab.
WARNING
The fuel hose may be under pressure. Cov-
er the fuel line connection with an absorbent
shop rag. Slowly disconnect the fuel hose
toreleasethepressure. Wipeoffanyfuel
spillage inside bilge.
The pressure test will show the available pressure
at the fuel pump outlet. It validates the pressure
regulator, the fuel pump and leaks in the system.
Remove glove box to have access to fuel pump.
Refer to HULL/BODY section.
Remove air vent tube from front storage area.
Ensure there is no leak from hoses and fittings.
Repair any leak.
Ensure there is enough gas in fuel tank.
Disconnect outlet hose from fuel pump.
Install fuel pressure gauge (P/N 529 035 591) be-
tween disconnected hose (inline installation).
F02B0BA
FUEL PRESSURE GAUGE (P/N 529 035 591)
1
F18R08A
2
1. Hose disconnected from fuel pump
2. In-line installation of fuel pressure gauge
Install safety lanyard and observe fuel pressure.
Do not crank engine. Repeat twice. Release
pressure using B.U.D.S. between tests so that the
gauge is “reset” to zero (0).
MODELS
FUEL PRESSURE
(when installing safety
lanyard)
4-TEC naturally
aspirated/supercharged
303 kPa (44 PSI)
4-TEC supercharged
intercooled
399kPa(58PSI)
(Inter cooled models)
Crank or start engine and observe fuel pressure.
The fuel pressure should be the same as above.
If pressure is good, fuel pump and pressure regu-
lator are working adequately.
A rapid pressure drop indicates leakage either
from the fuel rail or from the fuel pump check
valve. Check fuel rail for leaks. If it occurs while
installing safety lanyard on DESS and fuel rail is
not leaking, then replace fuel pump.
A slow pressure drop indicates leakage either
from the fuel injector or from the fuel pressure
regulator. Check fuel injector for leaks (see be-
low). If it is not leaking then replace fuel pump
module.
Release fuel pressure in the system using
B.U.D.S. Look in the Activation tab.
Remove pressure gauge and reinstall fuel hose.
412 smr2004-Complete Line Up
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