Alcohol/Contaminants-In-Fuel Diagnosis; Alcohol In Fuel Testing Procedure - Suzuki XL7 2007 Service Manual

1G-30 Fuel System:
Circuit/System Verification
WARNING
!
Place a dry chemical (Class B) fire
extinguisher near the area before performing
a Fuel Tank Leak Check. Before removing the
fuel tank for a suspected leak, make sure that
the fuel pipes or the tubes are not leaking
onto the tank. Once removed, make sure that
the fuel is not leaking around the fuel sender
O-ring. Failure to follow these precautions
may result in personal injury.
1. Verify that the fuel tank and the fuel pipes are not
damage or leaking.
➢ If you located a condition, repair as necessary.
2. Ignition ON, command the fuel pump relay ON with a
scan tool. Verify that the fuel pipes are not leaking.
➢ If you located a condition, repair as necessary.
NOTE
Refer to the J 41413-200 Evaporative
Emissions System Tester (EEST) operation
manual for detailed instructions.
3. Ignition OFF, install the J 41413-200 and the GE-
41415-50 to the fuel filler pipe.
4. Command the EVAP vent solenoid closed with a
scan tool.
5. Turn the nitrogen/smoke valve to Nitrogen and verify
that there is no liquid fuel leak while the system is
under pressure.
➢ If a leak is located, repair as necessary.
NOTE
It may be necessary to partially lower the fuel
tank.
6. Using the J 41413-200 introduce smoke into the
EVAP system. Verify that there are no vapor leaks in
any of the following locations:
– The fuel tank, the fill limiter vent valve, the
pressure relief valve, and the grade vent valves
– The fuel sender housing, the fuel sender seal, the
fuel pipe, and the EVAP pipes
– The fuel tank pressure (FTP) sensor seal
– The fuel fill pipe and hose
➢ If a leak is observed, repair as necessary.

Alcohol/Contaminants-in-Fuel Diagnosis

(w/o Special Tool)
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.
Description
Water contamination in the fuel system may cause
driveability conditions such as hesitation, stalling, no
start, or misfires in one or more cylinders. Water may
collect near a single fuel injector at the lowest point in
the fuel rail, and cause a misfire in that cylinder. If the
fuel system is contaminated with water, inspect the fuel
system components for rust, or deterioration.
Alcohol concentrations more than 10 percent in the fuel
can be detrimental to fuel system components. Alcohol
contamination may cause fuel system corrosion,
deterioration of rubber components, and subsequent fuel
filter restriction. Fuel contaminated with alcohol may
cause driveability conditions such as hesitation, lack of
power, stalling, or no start. Some types of alcohol are
more detrimental to fuel system components than
others.

Alcohol in Fuel Testing Procedure

The fuel sample should be drawn from the bottom of the
tank so that any water present in the tank will be
detected. The sample should be bright and clear. If
alcohol contamination is suspected then use the
following procedure to test the fuel quality.
1. Using a 100 ml (3.38 oz) specified cylinder with 1 ml
(0.34 oz) graduation marks, fill the cylinder with fuel
to the 90 ml (3.04 oz) mark.
2. Add 10 ml (0.34 oz) of water in order to bring the
total fluid volume to 100 ml (3.38 oz) and install a
stopper.
3. Shake the cylinder vigorously for 10-15 seconds.
4. Carefully loosen the stopper in order to release the
pressure.
5. Re-install the stopper and shake the cylinder
vigorously again for 10-15 seconds.
6. Put the cylinder on a level surface for approximately
5 minutes in order to allow adequate liquid
separation.