You’ve decided that a rotary screw compressor system is the right choice for your application; maybe you are converting from using reciprocating compressors. When installing your new compressor you’ll need to locate a few different components and plumb hosing between them. In this article, we’ll briefly explain the functions of the components of a rotary screw compressor system. Continue reading “Components of your VMAC mobile rotary screw air compressor system”
The only air compressor specifically engineered for commercial vans – VMAC UNDERHOOD 40 – Van Series
If vehicle weight is a concern, and commercial van payload is limited, you can now choose equipment that not only reduces vehicle weight, but also frees up space, maximizes operator productivity, and eliminates common safety issues. Continue reading “Air Compressor Options Available for Service Vans”
What’s wrong with extra weight on heavy duty pickup trucks?
Gross vehicle weight ratings (GVWR) and payloads can differ from vehicle to vehicle. It is important to know what you’re working with when specifying or upfitting a specific heavy duty pickup truck. Continue reading “Top 5 challenges caused by over-weight heavy duty pickup trucks”
The Buck (moisture) Stops Here!
Like all compressed air drying systems, each design has its abilities and its limitations. Continue reading “Membrane Type Dryer”
What’s wrong with extra weight on commercial vans?
Commercial van gross vehicle weight ratings (GVWR) and payloads can differ from vehicle to vehicle. It is important to know what you’re working with when specifying or upfitting a specific commercial van. Continue reading “Issues caused by over-weight commercial vans”
Heaterless Type (Pressure Swing Dryers)
Dual tower desiccant air dryers are used to produce dewpoint temperatures below the freezing point of water, as well as reduce the moisture content of compressed air used in critical process applications. Typical dewpoints produced by these types of dryers are -40° F to -100° F, although lower dewpoints are possible. Continue reading “What are Dual Tower Regenerative Desiccant Air Dryers (and how do they work?)”
Protect your engine, turn off your fuel
You just finished a job using your gas drive air compressor and you’re getting ready to drive to your next job. Did you remember to shut off your fuel valve? In this article we’ll explain why you should.
Most small gas engines have a fuel valve that should be shut off by when the engine is not in use. This can be easy to forget, especially when using remote controls.
Fuel shut-off becomes important when moving equipment as vibration can cause the carburetor needle valve to move allowing fuel to trickle into the carburetor, the float chamber and down the intake valve. This can cause:
- Engine flood, causing downtime waiting for the flood to clear.
- Dilution, when fuel goes past piston rings and mixes with oil, causing engine damage.
- Hydraulic lock, when incompressible liquid causes engine damage or failure.
Best practice for small gas engines – ensure equipment is on level ground, and the fuel valve is shut off when re-fueling and when equipment is not in use.
Why does the engine flood?
Any time vibration causes the carburetor float to drop in the float chamber, pressure is reduced against the needle valve. Reduced pressure against the needle valve allows pressurized fuel from the fuel tank to pass through the valve.
If this happens frequently, fuel will overfill the float chamber, flood down the throat of the carburetor, and flow into the cylinder through the open intake valve.
Fuel in the cylinder can flood the combustion chamber above the piston, creating hydraulic lock, preventing the engine from turning. This fuel will also slowly drain past the piston rings, diluting the oil in the crank case. If the engine manages to start with diluted oil, severe and premature engine damage will follow.
How does the float work?
The float chamber is located below the carburetor body. Through the operation of the float and the needle valve, the float chamber maintains a constant fuel level while the engine is working. The fuel flows from the tank into the float chamber through the needle valve. When the fuel rises to a specific level, the float rises. When the buoyancy of the float is balanced with the fuel pressure, the needle valve shuts off the fuel passage, thereby maintaining the fuel at the predetermined level.
Any other reasons?
Not only does shutting off the fuel valve prevent the engine from flooding while being transported, it prevents flooding because of contamination in the float valve, and extends the life of the float valve by decreasing pressure on it.
Is this unique to Honda engines?
Most manufacturers of small gas engines have this same issue. Like the Honda engines used in VMAC G30 Gas Drive Air Compressors, Subaru and Kohler engines used in other air compressor brands state in their literature that fuel valves should be shut off when not in use, including during transport.
VMAC G30 Gas Drive Air Compressors are powered by Honda’s GX390 air cooled 4-stroke engine. The G30 is a Honda-approved application. The engine includes electric start capability, is EPA and CARB-compliant, and comes with Honda’s 3-year warranty.
Do you have questions about VMAC’s G30 Gas Drive Air Compressor? Please give us a call at 1 888 514 6656 or email us at [email protected].
If you have any questions about this article or anything mobile compressor related, please contact us.