Fuel System Pressure - Test
Low fuel pressure can cause low power. Low fuel pressure can also cause cavitation of the fuel which can damage the fuel injectors. The following conditions can cause low fuel pressure:
- Plugged fuel filters
- Worn gears in the fuel transfer pump
- Pinched fuel lines or undersized fuel lines
- Old fuel lines that have a reduced interior diameter that was caused by swelling
- Fuel lines with deteriorating interior surfaces
- Pinched fuel line fittings or undersized fuel line fittings
- Contamination in the fuel tank, fuel lines, or fuel system components that create restrictions
Excessive fuel pressure can cause fuel filter gaskets to rupture. The following conditions can cause high fuel pressure:
- Malfunctioning HPFP
- Pressure relief valve in fuel rail stuck closed
- Pinched fuel return line
Caterpillar Information System:
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