Fuel Tank Leak Test - Suzuki XL7 2007 Service Manual

5. With a scan tool, select the Fuel Injector Balance
Test function, within the Special Functions menu.
Select a fuel injector to be tested and press Enter in
order to prime the fuel system. Record the fuel
pressure indicated by the fuel pressure gage after
the fuel pressure stabilizes. This is the 1st pressure
reading.
NOTE
• Repeat this step for each fuel injector in
order to obtain a pressure drop value for
each fuel injector.
• The fuel pressure may rise after the fuel
injector stops pulsing. Record the fuel
pressure value immediately after the fuel
injector stops pulsing. DO NOT record the
higher fuel pressure value.
6. Energize the fuel injector by depressing the Pulse
Injector button on the scan tool. This will energize
the fuel injector and decrease the fuel pressure.
Record the fuel pressure indicated by the fuel
pressure gage after the fuel injector has stopped
pulsing. This is the 2nd pressure reading.
7. Press Enter to return to the Select Injector screen.
8. Add all of the individual pressure drop values in
order to calculate the total pressure drop. Divide the
total pressure drop by the number of fuel injectors in
order to calculate the average pressure drop. The
difference between any individual pressure drop and
the average pressure drop should not be more than
20 kPa (3 psi).
➢ If the difference between any individual pressure
drop and the average pressure drop is more than
20 kPa (3 psi), replace the fuel injector.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
"Fuel Injector and Fuel Rail Replacement"

Fuel Tank Leak Test

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
Circuit/System Description
The fuel tank leak test is used to locate any fuel or fuel
vapor escaping the fuel tank area. Fuel vapors escaping
above the fuel level will be detected when the
evaporative emission (EVAP) leak diagnostic completes
one test cycle. The malfunction indicator lamp (MIL) will
illuminate after the EVAP leak diagnostic completes 2
test cycles for a large leak or up to 8 test cycles for a
small leak, only when a condition is detected.
Diagnostic Aids
• Operate the vehicle under the condition of the
customer concern. Under high temperature conditions
fuel vapors may increase to the point of EVAP
canister vapor saturation. Fuel vapors would then be
released into the atmosphere. Once the engine is
running and the EVAP purge is enabled, all fuel vapor
release would be eliminated.
• Movement of the EVAP pipes or the fuel pipes may
help find an intermittent condition.
• If the fuel level is low, a liquid fuel leak may not be
evident.
Reference Information
Special Tools Required
• J 41413-200 Evaporative Emissions System Tester
(EEST)
• GE-41415-50 Interrupted Thread Cap Adapter
Fuel System: 1G-29