Generac Power Systems Magnum MGG100M, Operator'S Manual

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Maintenance
36833 C MGG100M Operating Manual 53
Vaporizer Regulator
During the course of normal operation of propane-fired engines, an oil-like residue called heavy ends can build inside
the secondary chamber of the vaporizer regulator. The residue may be a result of poor fuel quality, contamination
of the fuel, or regional variation of the fuel make up. A significant build up of oil can affect the performance of the
secondary diaphragm response. It is recommended that the oil be drained periodically. This is the minimum
requirement to maintain the emission warranty.
The vaporizer regulator should be drained at every engine oil change, if contaminated or sub-standard fuel is
suspected or known to have been used. Failure to follow this recommendation may be used to deny a warranty claim.
Draining Oil Build-Up from Regulator
Draining the regulator when the engine is warm helps the oil to flow freely from the regulator. To drain the regulator,
follow the steps below.
1. Ensure the equipment is in a well-ventilated area and no external ignition sources are present.
2. Start the engine.
3. With the engine running, close the manual valve.
4. When the engine runs out of fuel, turn the key switch to OFF and turn the battery disconnect switch to OFF.
5. Loosen the hose clamps at the inlet and outlet hoses on the regulator and remove the hoses.
6. Remove the regulator mounting bolts.
7. Place a small receptacle in the engine compartment under the regulator.
8. Rotate the regulator 90° so that the outlet fitting is pointing down into the receptacle and drain the regulator.
9. Inspect the secondary chamber of the regulator for any large dried particles and remove.
10. Rotate the regulator back to its original position and reinstall the regulator mounting bolts.
11. Remove the receptacle. Dispose of any drained material in a safe and proper manner.
12. Reinstall the fuel hoses.
13. Reconnect any other hoses removed during this procedure.
14. Slowly open the manual service valve.
Note: The fuel cylinder manual valve contains an excess flow check valve. Open the manual valve slowly to
prevent activation the excess flow check valve.
15. Check for leaks at the inlet and outlet fittings using a soapy solution or an electronic leak detector. If leaks are
detected, repair the leaks.
16. Check coolant line connection to ensure no leaks are present.
17. Start engine.
18. Recheck for leaks at the regulator.