PSI Emission Certified Stationary Engine Fuel and Control System Diagnostic Service Manual (tp6724)

These PSI emission-certified stationary engines usually sit on generators or pumps, running long hours in plants or remote sites where uptime and emissions compliance matter. This diagnostic fuel and control system manual is what I’d pull out when the engine starts hunting, won’t take load, or throws a fuel-related fault. It walks you through how to trace a symptom from the control system back through sensors, wiring, and fuel hardware so you can confirm what actually failed before you start swapping parts.

Applications & Use Cases

• Chasing hard-start or no-start issues by verifying fuel supply, control signals, and shutoff logic step by step.
• Isolating rough running or misfire to see if it’s fuel quality, delivery, or a control/sensor problem.
• Confirming a suspected sensor or actuator failure with guided tests instead of guessing.
• Supporting clean disassembly/reassembly of fuel components so seals, routing, and adjustments go back correctly.
• Checking control-system reactions after repairs to verify the engine responds properly under load.

FAQ

Q: Can I use this manual on a tablet at the unit?

A: Yes, it’s practical to view digitally so you can zoom wiring and diagnostic steps while working at the engine.

Q: Is it worth printing sections of this manual?

A: Many techs print just the diagnostic trees and test procedures they use often and keep them in a job folder near the unit.

Safety Note

Always isolate the engine, depressurize the fuel system, and follow lockout procedures before opening any fuel or control components.

PSI Emission Certified Stationary Engine Index:

General Information …………………………………………………………………………………… 3
An overview of this Service Manual
Maintenance ……………………………………………………………………………………………… 6
General maintenance and maintenance interval information
Fuel System ……………………………………………………………………………………………. 14
An overview of the fuel system and its components
LPG Fuel System Diagnosis …………………………………………………………………….. 21
How to identify a general problem
LPG Symptom Diagnostics ………………………………………………………………………. 29
How to correct a specific problem
Electrical Section ………………………………………………………………………………………. 42
Diagnostic Scan Tool ……………………………………………………………………………. 61
Using the DST for testing and trouble shooting
Engine Wire Harness Repair …………………………………………………………………. 83
Repairing a wire harness on the vehicle
Diagnostic Trouble Codes (DTCs) ……………………………………………………….. 87
Application, schematic and DTC specific code information
Definitions ………………………………………………………………………………………………. 272
Definitions of phrases and acronyms used throughout this Service Manual

Kohler