Vanguard BIG BLOCK M540000, Repair Manual

Page: 27 / 168

1. Visually inspect the fuel system, its components, wiring
harness and connectors.
2. Perform On-Board Diagnostic (OBD) system check.
Refer to applicable EFI Diagnostic Manual.
3. Follow the directions of the EFI
troubleshooting diagnostics tables within the applicable
EFI Diagnostic Manual.
Check Fuel System Pressure - EFI and EFI-ETC
The fuel rail is under high pressure. To connect the necessary
fuel pressure test adaptor and gauge, it is necessary to first
relieve system pressure. You must follow all steps in order to
prevent an uncontrolled discharge or spray of fuel.
1. Turn Ignition OFF.
2. Loosen fuel filler cap to relieve fuel tank pressure.
Tighten filler cap after loosening.
3. Remove access cover. See SECTION 4 - REMOVE
EXTERNAL ASSEMBLIES - Engine Covers .
4. Remove air cleaner assembly. See SECTION 4 -
REMOVE EXTERNAL ASSEMBLIES - Air Cleaner
Assembly .
5. Pull out grey secondary lock and press to disconnect fuel
pump module connector.
6. Turn Ignition ON, Engine ON.
7. Start and run engine until it stalls. If it does not start,
crank engine a few times to relieve fuel system pressure.
8. Obtain the following tools:
• Briggs & Stratton Fuel Pressure Gauge, see Special
Tools List in this section.
• Briggs & Stratton BIG BLOCK Fuel Pressure Test
Adapter, see Special Tools List in this section.
9. Squeeze two tabs on quick disconnect fitting to release
fuel rail from fuel outlet port of fuel pump module.
NOTE: Wrap shop towel around fitting to catch any fuel
leakage.
10. Install fuel pressure test adapter between fuel rail and
fuel pump module.
11. Remove protective cap from Schrader valve on fuel
pressure test adapter and install fuel pressure gauge.
12. Connect fuel pump module connector. Push in grey
secondary lock to secure.
13. Turn Ignition ON to pressurize fuel system.
14. Note the reading of the fuel pressure gauge. Fuel
pressure should remain steady at 38-43 psi (262-296
kPa).
15. Turn Ignition OFF.
16. Position the clear bleed tube in an approved container
and press the pressure relief button on the gauge
assembly to relieve fuel system pressure. Fully depress
and hold the pressure relief button until pointer on the
dial face is resting on the stop pin.
17. Remove fuel pressure gauge from Schrader valve on fuel
pressure test adapter.
NOTE: A small amount of gasoline may drain from the
Schrader valve when the gauge is removed. Wrap a
shop towel around the valve fitting to catch any fuel
leakage.
18. Install protective cap on Schrader valve.
19. Remove fuel pressure test adapter between fuel rail and
fuel pump module.
20. Firmly push quick disconnect fitting on fuel rail onto fuel
outlet port of fuel pump module. Gently tug on fitting to
verify that it is properly seated and secure.
21. Turn ignition switch ON for two seconds, and then OFF
for 10 seconds. Turn the ignition switch back to ON and
check for fuel leaks.
22. Install air cleaner assembly. See SECTION 8 - INSTALL
EXTERNAL ASSEMBLES - Air Cleaner Assembly .
23. Install access cover. See SECTION 8 - INSTALL
EXTERNAL ASSEMBLIES - Engine Covers .
28 vanguardpower.com