VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
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Stopping the engine
The engine may experience a backfire if it is shut off while the engine
speed is above idle and the compressor is building air pressure. This
is normal and is caused by the load on the engine during shut down.
Ensure the engine is at idle prior to shutting it off.
The exhaust system is equipped with a spark arrester.
Improper shut down may cause compressor oil to discharge from the
compressor air filter.
Ensure the fuel shut off valve is closed (all the way to the left) when
the unit is not being run or before moving to a different site. Failure
to do this may allow fuel to overfill the carburetor float bowl and
flow into the engine’s cylinder and/or crank case causing the engine
to hydraulically lock.
Figure 21 — Shut off fuel
To properly shut down the engine:
1) Stop air use and close the air discharge valve.
2) Ensure the system has built to full system pressure (factory setting 140 psi) and
the compressor is “unloaded”.
3) Allow the engine to run at low idle for at least 10 seconds.
4) Turn the key to the “OFF” position.
5) Move the fuel shut off valve all the way to the left to shut off the fuel
