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The code you are probally getting it a ALT code which is a alternator code... check voltage coming out if the alternator and also make sure all the wires on the back of the alt are in good condition and tight
It varies based upon load. I have found it to be 0.25 Gal on the low side to 0.35 Gallons under heavy load. Its a bloody pig. The unit has to run at all times for any heating or cooling. This is where the Tripac has this unit beat hands down is on the fuel consumption. In the winter the Tripac uses an Espar bunk heater which uses only a fraction of the fuel that an APU engine does. In the summer when the APU cools the cab to the desired temperature, the Tripac shuts off where as the Carrier only turns off the electric A/C compressor but the engine continues to run.
The airport code for Apucarana Airport is APU.
Same way the heater on your truck works... coolant is run through the engine system, becomes heated, is run through a heater coil, and a blower blows the heated air around the heater coil through the ductwork to heat up the vehicle.
Apu
Apu comes from India.
Apu was born in India
Apu Nahasapeemapetilon http://en.wikipedia.org/wiki/Apu_Nahasapeemapetilon
The World of Apu was created in 1959.
Apu - magazine - was created in 1933.
apu does in his last name: nahasapeemapetalan
James Woods