Generac G9.0L G26 — Check Fuel System
Testing & diagnosis
For the Generac G9.0L G26, from the Generac service manual.
Applies to: Generac 130 kW PME, Generac 150 kW PME, Generac 9.0L Gaseous Engine (G26) engine
Before you start
- Explosion and fire. Fuel and vapors are extremely flammable and explosive. No leakage of fuel is permitted. Keep fire and spark away.
Procedure
- Turn off fuel to primary regulator.
- Connect a manometer to test port B.
- Turn fuel supply on and record Static Pressure (not running).
- Set AUTO-OFF-MANUAL switch to MANUAL and record Running Pressure.
Tools required
- Water manometer or gauge calibrated in inches of water column
- Fuel pressure tester kit Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Inlet fuel pressure at fuel regulator: 5–14 in. water column
- Pressure difference not-running to running should not exceed 1 in. of water column
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.