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* Transfer Pumps -- The majority of transfer pumps are of the diaphragm type that provide a maximum of 8 psi to the main pump. The diaphragm pump is simple in nature and usually trouble-free. However, the check valves may become sticky if the diesel fuel gets too old. Fungus and bacteria can gum up the valves and reduce both flow and pressure. Also, diaphragms can rupture, and fuel can leak into the engine oil. This can be detected during daily service checks. On an engine that consumes oil, oil consumption would appear to stop and the oil level might even rise on the dipstick.

THE MOTORMost hermetic compressors use induction motors cooled by either liquid or suction-gas refrigerant. Induction motors have copper windings that, when alternating current is run through them, create the magnetic fields that cause the motor to turn. These copper windings are bulky, adding size and weight to the compressor.Two-pole, 60-Hz induction motors operate at approximately 3,600 rpm. A higher number of revolutions per minute can be obtained by increasing the frequency. Compressors that require higher shaft speeds tend to use gears. While gears are a proven technology, they create noise and vibration, consume power, and require lubrication.The magnet-bearing compressor features a synchronous permanent-magnet brushless DC motor with a completely integrated variable-frequency drive (VFD). The stator windings found on conventional induction motors are replaced with a permanent-magnet rotor. Alternating current from the inverter energizes the armature windings. The stator (excitation) and rotor (armature) change places. No commutator brushes are required. The motor and key electronic components are internally refrigerant-cooled, so no special cooling is required for the VFD or the motor.

* If you''re not getting fuel or the smoke generator Stops when you hit the fog oil switch, check the supply line inside the fuel can. Sometimes the line can work loose and fall in the can. One smoke unit spent 1 1/2 days figuring out why their generator was shutting down before they discovered the supply line had worked loose.* If the fuel pump won''t keep running after you release the FUEL switch, have your mechanic check its circuit breaker. The breaker is right above the circuit board and has 5 written on it. If the breaker has popped out, push it back in and try the fuel pump again.