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Home›Repair guides›Kohler›Evacuating with a Vacuum Pump

Kohler — Evacuating with a Vacuum Pump

Maintenance · Gaseous fuel tank assembly

From a Kohler operator's manual covering: 125REZGT, 30--125REZGT, 30REZG, 30REZGT, 50REZG, 70REZGT. Check it applies to your exact model before use.

Applies to: Kohler 125REZGT, Kohler 30REZG, Kohler 30REZGT, Kohler 50REZG, Kohler 70REZGT

Before you start

  • There may still be liquid or gas propane in the supply line; use opening care.

Procedure

  1. Source a fitting connecting the main fuel supply line to the manual shutoff valve/vacuum pump assembly.
  2. Connect the vacuum pump outlet to the exhaust venting system.
  3. Open the exhaust venting system manual shutoff valve (A).
  4. Remove the main fuel supply line at the vaporizer.
  5. Attach the gaseous fuel tank line to the manual shutoff valve (B)/vacuum pump assembly with the vacuum gauge between (B) and the tanks.
  6. With manual shutoff valves (C) and (D) closed, connect the gaseous fuel tank to the LPG supply tank at the 1 3/4 ACME fitting.
  7. Open the manual override shutdown valve (E) for tanks to be purged; close all others.
  8. Switch the controller to ECM ON mode.
  9. Activate the vacuum pump until the vacuum gauge indicates 0--2 psia.
  10. Close the manual shutoff valve (B) at the vacuum pump inlet.
  11. Place the controller back to ECM OFF mode and turn off the vacuum pump.
  12. Open the LPG supply tank valve, fill the gaseous fuel tank to 5%, and close the valve.
  13. Disconnect the gaseous fuel tank from the LPG supply tank at the ACME fitting.
  14. Close the manual override shutdown valve (E) of the tank just filled; repeat for remaining tanks.
  15. Check all fittings and connections for leaks using an approved leak detector solution.

Tools required

  • User-supplied vacuum pump with manual shutoff valve and 0--15 psi vacuum gauge
  • Exhaust venting system Amazon
  • Approved leak detector solution Amazon

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

Specs & values

  • Vacuum of 0--2 psia
  • Fill to 5% of tank capacity

Full service-parts list: Kohler 125REZGT →, Kohler 30REZG →, Kohler 30REZGT →, Kohler 50REZG →, Kohler 70REZGT →

Source: Kohler operator's 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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