Cummins/Onan — Demand Regulator Test
Testing & diagnosis · LPG demand regulator
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan NHEL
Before you start
- Most parts cleaning solvents are flammable.
Procedure
- Connect pressure gauge to regulator test port.
- Connect compressed air at least 80 psi to inlet.
- Open air valve; gauge should indicate about 1-1/2 psi constant.
- Close air valve; pressure should remain constant.
- Disassemble and clean if either test fails.
- Replace regulator if it still fails.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan NHEL →
Source: Cummins/Onan 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.