FUEL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
FUEL SYSTEM PRESSURE TEST - CONTINUED
Low Fuel Pressure
Low fuel pressure can cause low power and fuel cavitation, which can damage fuel injectors. Check for these conditions
which can cause low fuel pressure:
Contamination in check valves for fuel transfer pump (WP 0188 00).
Sticking or worn fuel pressure regulating valve in fuel transfer pump (WP 0188 00).
Faulty fuel transfer pump (WP 0188 00).
Old fuel lines with a reduced interior diameter due to swelling (WP 0034 00).
Contamination in fuel tank, fuel lines, or fuel system components that create restrictions or blockage.
High Fuel Pressure
Excessive fuel pressure can cause fuel filter gaskets to rupture. Check for these conditions which can cause high fuel
Plugged orifices in fuel pressure regulating valve (WP 0188 00).
Stuck fuel pressure regulating valve in fuel transfer pump (WP 0188 00).
AIR INLET AND EXHAUST SYSTEM INSPECTION
N OT E
Refer to included manual, "Using Tester, Internal Combustion Engine" for Internal Combustion Engine
Air Inlet Restriction
N OT E
A restriction in the air inlet system or the exhaust system reduces engine performance.
Inspect engine air cleaner inlet and engine air cleaner tubing for passageway blockage or collapse (WP 0030 00).
Inspect engine air cleaner elements. Replace dirty or damaged engine air cleaner elements (WP 0030 00).
Check for dirt tracks on clean side of engine air cleaner elements. If dirt tracks are observed, contaminants are flowing
past engine air cleaner elements and/or seal for engine air cleaner elements. Replace engine air cleaner elements (WP