Isuzu 4LE1 2.2L Engine

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• Unit will not crank when power fails
  Cause: Digital genset not in AUTO
• Engine won't crank
  Cause: Low/dead battery
• Engine cranks but will not start
  Cause: Improper fuel delivery to the unit
• Engine will not come up to speed after it starts
  Cause: Insufficient fuel volume getting to the unit — 1. Too small of fuel line
• Engine starts, then stops and alarm light comes on
  Cause: Engine oil pressure is low
• ATS will not transfer to Emergency Supply (generator)
  Cause: No AC generator output
• No output from AC generator
  Cause: Loss of speed signal
• ATS will not re-transfer to normal power
  Cause: Proper power line not available at line terminals in ATS panel

Compiled from service & troubleshooting documentation across every generator set that uses the Isuzu 4LE1 2.2L.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

• Air filter: Isuzu 5864014350 Isuzu 8972599390 Donaldson P775687 Donaldson P821575 Donaldson P822858 Wix 46368 Baldwin PA3850 Wix 46438NP
• Fuel filter: Isuzu 8944015310 Donaldson P502166 Wix 33263 Baldwin PF981
• Oil filter: Isuzu 5876100080 Donaldson P550162 Wix 51334 Ac Delco X45 Baldwin B179

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

• Hitachi EX40U — Excavator Compact
• Hitachi EX50U — Excavator Compact
• Hitachi EX55UR-3 — Excavator Compact
• Hitachi EX58MU — Excavator Compact

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.