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Home›Repair guides›Kohler›Procedure to Convert from NG to LP

Kohler — Procedure to Convert from NG to LP

Adjustments · Fuel system

From a Kohler service manual covering: 12RES, 12RESL/12RESM1, 18RES. Check it applies to your exact model before use.

Applies to: Kohler 12RES, Kohler 18RES

Before you start

  • Explosive fuel vapors. Can cause severe injury or death. Use extreme care when handling, storing, and using fuels.
  • Accidental starting. Disconnect the battery cables before working on the generator set; remove the negative (--) lead first.

Procedure

  1. Place the generator set master switch in the OFF position.
  2. Disconnect the power to the battery charger.
  3. Disconnect the generator set engine starting battery, negative (--) lead first.
  4. Turn off the fuel supply.
  5. Remove the hose clamp and fuel hose from the hose fitting.
  6. Place the orifice into the hose fitting.
  7. Slide the hose onto the hose fitting and secure it with the clamp.
  8. Disconnect the digital spark-advance module (DSAI) leads for LP (connect the leads for natural gas).
  9. Connect and turn on the new fuel supply.
  10. Check that the generator set master switch is in the OFF position.
  11. Reconnect the generator set engine starting battery leads, negative (--) lead last.
  12. Reconnect power to the battery charger.
  13. Start the generator set by moving the generator set master switch to the RUN position.
  14. Check for leaks using a gas leak detector.
  15. Move the generator set master switch to the OFF/RESET position to shut down the generator set.

Tools required

  • Gas leak detector Amazon
  • Wrench (to hold fuel solenoid valve) Amazon

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Fuel supply inlet 1/2 NPT
  • Fuel supply pressure 12RESL NG 1.3--2.7 kPa (5-11 in. H2O), LP 1.7--2.7 kPa (7-11 in. H2O)
  • Fuel supply pressure 18RESL NG 1.7--2.7 kPa (7-11 in. H2O), LP 1.7--2.7 kPa (7-11 in. H2O)

Full service-parts list: Kohler 12RES →, Kohler 18RES →

Source: Kohler 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.

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