Generac — LP Gas Leakage Test
Testing & diagnosis · Propane fuel system
From a Generac service manual covering: NP-50G, NP-50LP, NP-66G/LP, Q-40G, Q-55G/LP, Q-70G/LP. Check it applies to your exact model before use.
Applies to: Generac NP-50G, Generac NP-50LP, Generac Q-40G, Generac NP-50G/LP engine
Before you start
- Do not use any flame to test for leaks.
- No leakage is permitted.
Procedure
- Use a separate source of 12 volts DC to open the gaseous fuel solenoid valve.
- Test all connections, hoses, valves, regulators, fittings, and other fuel system parts under gas or air pressure of not less than 90 psi (620 kPa).
- Use soap and water or equivalent solution to check for leaks.
- Do not use any flame to test for leaks.
- Comply with NFPA Paragraph 318.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 90 psi (620 kPa) minimum test pressure
Full service-parts list: Generac NP-50G →, Generac NP-50LP →, Generac Q-40G →
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.