3. Ensure the red cap is present on the secondary
relief valve.
4. Inspect the fuel tank pressure gauge for cracks
in the sight glass. Ensure the indicator needle is
present and in working condition. Inspect the
gauge face for accuracy and legibility.
5. Inspect all vent lines for kinks, and signs of leaks
or damage.
6. Replace leaking or damaged fuel lines. Repair or
replace leaking or damaged fittings.
Fuel Level Sender Component
Inspecting
1. Inspect the fuel level sender wiring harness for
signs of loose connections or damage. Look for
cracking or signs of moisture intrusion.
2. Inspect the fuel level sender box, shown in
Fig. 7, item 6, for signs of leaks or damage.
Ensure that the retainer clips are installed on the
mounting ears.
3. Inspect all connectors and wiring for signs of
loose connections, damage, or chafing.
4. Turn the ignition switch to the ON position and
check for fuel gauge response.
5. Repair or replace any damaged fuel gauge
components.
Vaporizer Inspecting
See Fig. 8 for plumbing component locations.
1. Ensure that the vaporizer is secured to its
mounting brackets and that the mounting
brackets are secured to the frame. Inspect for
any signs of looseness.
2. Inspect the vaporizer fuel inlet and outlet lines for
signs of chafing, damage, or leaks.
3. Inspect the vaporizer coolant hoses for signs of
chafing, damage, or leaks.
4. Inspect all fittings for leaks.
5. Inspect the fuel shutoff solenoid valve for signs
of leaks or damage. Inspect the solenoid
mounting bracket for looseness.
6. Inspect the overpressure regulator for signs of
leaks or damage.
6.1 Ensure that the regulator is mounted
securely.
6.2 Check the overpressure regulator fittings
for signs of leaks or damage.
6.3 Ensure that the adjustment handle locking
nut (at the bottom of the overpressure
regulator) is tightened securely.
6.4 Inspect the pressure gauge for damage.
Ensure that the gauge sight glass is clear
and legible.
7. Repair or replace any leaking or damaged
vaporizer components.
05/05/2010 f470533
1
2
3
4
5
6
7
8
10
11
12
9
1. Pressure Control
Regulator
2. Vapor Shutoff Valve
3. Fuel Fill Hose
4. Secondary Relief
Valve (red cap)
5. Fuel Fill Fitting
6. Fuel Level Sender
Box
7. Primary Relief Valve
8. Tank Pressure Gauge
9. Fill Vent Fitting
10. Excess Flow Valve
11. Fuel Shutoff Valve
(liquid)
12. Fill Check Valve
Fig. 7, Fuel Tank Plumbing Components
Fuel47
Business Class M2 Plus Maintenance Manual, 02/10/202347/6
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