Perkins generator controller shows E027 and indicates fuel pressure low

Safety: High‑pressure fuel systems can be dangerous. Do not loosen high‑pressure lines while running. Follow Perkins common‑rail safety procedures.

• Replace filters: Change primary and secondary fuel filters and bleed the system thoroughly.
• Check for external leaks: Inspect high‑pressure lines, rail, and injectors for visible leaks or diesel smell. Do not touch suspected leaks with bare hands.
• Sensor check: Compare commanded vs. actual rail pressure using diagnostic tools (if available). A faulty fuel rail pressure sensor can misreport pressure.
• Injector leak‑off test: Perform a leak‑off test to identify injectors returning excessive fuel, which can cause low rail pressure.
• High‑pressure pump: If filters and injectors are OK but pressure remains low, the high‑pressure pump may be worn and require replacement by a qualified technician.