Service manual

9-2013 4. Service
4.5 Fuel System Components Testing
WARNING
Fuel systems must be installed by qualified service technicians. Improper installation
presents hazards of fire and improper operation, resulting in severe personal injury or
property damage.
WARNING
Gaseous fuels are flammable and explosive and can cause severe personal injury or death. Do
not smoke if you smell gas or are near fuel tanks or fuel-burning equipment or are in an area
sharing ventilation with such equipment. Keep flames, sparks, pilot lights, electrical arcs and
arc-producing equipment and all other sources of ignition well away. Keep a type ABC fire
extinguisher handy.
CAUTION
Unauthorized modifications or replacement of fuel, exhaust, air intake or speed control system
components that affect engine emissions are prohibited by law in the State of California.
The following image illustrates the fuel system components. The gas demand regulator meters
fuel to the engine gas-air mixer. It is usually not the cause of fuel system problems. All other
possible fuel system problems should first be checked out.
No. Description No. Description
1 Hose Adapter 3 Solenoid
2 Fuel Regulator 4 Nipple Fitting
Note: The test port (thread size 3/8 NPT) is located on the back side of this image.
FIGURE 4. FUEL SYSTEM COMPONENTS (SPEC A AND CANADIAN GSBB SPEC B)
A030A239 (Issue 10) 23