Buell 2008 XB SERIES Electrical Diagnostics Manual page 98

Fuel Pressure Test (Part 1 of 2)
High Pressure.
Check for faulty Fuel
Pump and replace.
See FUEL PUMP in the
appropriate Buell
Service Manual.
Ignition Relay terminal "30" or
seconds after Ignition Switch
Is voltage greater than 1.0V?
Locate and repair
poor connection
between Battery
and Ignition Relay.
2-48 2008 Buell XB Diagnostics: Engine Management
Run fuel pressure test as described
under 2.15 FUEL PRESSURE TEST.
Does fuel pressure remain steady at
YES.
No trouble found.
Review symptoms.
YES
Move negative (-) probe to
Ignition Relay terminal "87" or
"5" (GY). Measure voltage on
during first two seconds after
Ignition Switch is ON. Is
voltage greater than 1.0V?
YES
Move negative (-) probe to
Locate and repair
"3" (GY/O) wire. Measure
poor connection
voltage during first two
between Ignition
Relay and Fuel
is ON.
YES NO
Replace
Ignition
Relay.
49-51 PSI (338-352 kPa)?
Low Pressure.
Check voltage drop between
battery positive (+) and fuel
pump connector [86B] terminal
during first two seconds after
Ignition Switch is ON.
Is voltage greater than 1.0V?
Check for restricted Fuel
Pump Inlet Screen.
Is screen restricted?
YES
NO
Flush out fuel cell.
See FUEL PUMP in
the appropriate
Buell Service
Manual.
Pump.
No Pressure.
STOP
Go to Fuel
Pressure Test
(Part 2 of 2).
NO
NO
Check for faulty
Fuel Pump and
replace. See
FUEL PUMP in
the appropriate
Buell Service
Manual.
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