Generac — Fuel Pressure Test at Startup
Testing & diagnosis · Gaseous fuel system
From a Generac service manual covering: 155 DFE 15R, 155 DFE 515R, 180 DFE 15R, 180 DFE 515R, XG03245, XG04045, XG04845. Check it applies to your exact model before use.
Applies to: Generac XG03245, Generac XG04045, Generac XG04845
Before you start
- Severe valve deformation can occur if gauge probe is left in test port for hours or days.
Procedure
- Connect a load bank (or load bank + system load) to bring unit to full rated kW load.
- Measure fuel supply pressure at test port at fuel solenoid shutoff valve under static, cranking, no-load, and full-load conditions.
- Verify pressure stays within 3.5-14 in H2O (NG) or 7-14 in H2O (LP) and drop does not exceed 1-2 in H2O.
- Tighten protective cap on test port to prevent tampering.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Generac XG03245 →, Generac XG04045 →, Generac XG04845 →
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.