Cummins/Onan — Testing Fuel System for Leaks
Testing & diagnosis
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Do not test with a flame.
Procedure
- Energize fuel solenoid from a separate 12 volt DC source before testing the fuel system for leaks.
- Test all fuel system connections, hose, valves, regulators, and fittings with soap and water or equivalent solution.
- Test while system is under gas or air pressure of not less than 90 pounds per square inch (620 kPa).
- Do not test with a flame.
- Conform to procedures listed in NFPA-58 Paragraph 318 or UL recommended test procedure.
Tools required
- soap and water or equivalent solution Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 90 pounds per square inch (620 kPa) minimum test pressure
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.