Fuel Pressure Test; Inspection - Buell 2008 XB SERIES Electrical Diagnostics Manual

FUEL PRESSURE TEST

INSPECTION

PART NUMBER
B-45522 FUEL PRESSURE GAUGE ADAPTER
HD-41182 FUEL PRESSURE GAUGE
To prevent spray of fuel, purge system of high-pressure
fuel before supply line is disconnected. Gasoline is
extremely flammable and highly explosive, which could
result in death or serious injury. (00275a)
1. Remove airbox. See the appropriate Buell Service Manual.
2. Purge the fuel supply line of high pressure gasoline.
a. See Figure 2-35. Disconnect the 4-place fuel pump
connector [86]. The connector is located inside the
left rear portion of the fuel tank/frame.
b. With the motorcycle in neutral, start the engine and
allow vehicle to run.
c. When the engine stalls, press the starter button for 3
seconds to remove any remaining fuel from fuel line.
Wipe up spilled fuel and dispose of rags in a suitable
manner. An open spark around gasoline could cause a
fire or explosion, resulting in death or serious injury.
(00518b)
3. Figure 2-38 Depress button (2) of fuel line connector and
disconnect the fuel line (3) from throttle body inlet (1).
4. See Figure 2-39. Attach FUEL PRESSURE GAUGE
ADAPTER (Part No. B-45522) (2) to throttle body inlet (1).
5. Connect the fuel line (3) to fuel pressure gauge adapter.
See Figure 2-40. Verify that fuel valve (2) and air bleed petcock
(5) on the gauge are closed.
6. Attach FUEL PRESSURE GAUGE (Part No. HD-41182)
(4) to fuel pressure gauge adapter (1).
7. See Figure 2-35. Attach fuel pump connector [86] to main
wiring harness.
8. See Figure 2-40. Pressurize the fuel system.
a. Start and idle engine to pressurize the fuel system.
b. Open fuel valve (2) on fuel pressure gauge to allow
fuel to flow down the gauge hose.
c. Position the air bleed tube (3) into proper container.
d. Open and close the air bleed petcock (5) to purge the
fuel pressure gauge and hose of air. Repeat this step
several times until only solid fuel (without bubbles)
flows from the air bleed tube.
e. Close the air bleed petcock.
2-42 2008 Buell XB Diagnostics: Engine Management
TOOL NAME
NOTE
9. Open throttle and increase engine speed to 2500-3000
RPM. Note the reading on the pressure gauge.
a. If pressure is 49-51 PSI (338-352 kPa) then system
is operating within limits.
b. If pressure is not within limits, see flow chart after
disconnecting pressure gauge.
Wipe up spilled fuel and dispose of rags in a suitable
manner. An open spark around gasoline could cause a
fire or explosion, resulting in death or serious injury.
(00518b)
10. See Figure 2-40. Turn engine off. Detach pressure gauge
(4) from adapter (1).
a. Open the air bleed petcock (5) to relieve fuel system
pressure and purge the pressure gauge of gasoline.
b. Remove adapter from vehicle.
11. Detach adapter from vehicle.
12. Connect fuel line to throttle body inlet.
ed01531
Figure 2-35. Fuel Pump Connector [86] (Ulysses - swingarm
removed for illustration)
2.15