Generac — Installing & Connecting Gas Lines
Installation
From a Generac service manual — check it applies to your exact model before use.
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Before you start
- Natural gas and LP Vapor are highly volatile substances; strictly adhere to all safety procedures, codes and regulations.
Procedure
- Gas line connections should be made by a certified plumber familiar with local codes.
- Verify the capacity of the natural gas meter or LP tank to provide sufficient fuel for the generator and other appliances.
- Most applications will require an external manual shutoff valve on the fuel line.
- Install a T-fitting where the gas line enters the generator to allow gas pressure monitoring.
- Use the provided UL Listed or AGA-approved flexible fuel line with as few bends as possible.
- Never bend the flexible fuel line to avoid using an elbow.
- After checking for leaks, check gas pressure at the T-fitting for proper generator operation.
- Contact the gas supplier if pressure is too low or greater than 14 inches of water column.
- When finished checking gas pressure, close the manual shutoff valve.
Tools required
- manometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Use 1/4 inch NPT nipple and threaded plug at T-fitting
- Maximum gas pressure 14 inches 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.