Section 14 - Engine Testing - Group 14 Engine Testing - General Information M11 Page 14-7 Note: On CELECT™engines, the engine fuel inlet line must flow through the ECM cooling plate to provide proper cooling of the ECM dur- ing engine operation. The fuel measuring device is installed in series between the fuel supply tank and the engine fuel inlet. The quantity of fuel being drawn through the flowmeter is know as fuel or the amount of fuel being burned by the engine. The flowmeter is graduated to read fuel flow in pounds per hour. The flowmeter contains two floats with respective scales on either side of the flowmeter.
The small float is used to mea- sure lower flows and must be read on the left scale, as shown. The larger float is for mea- suring higher flows and must be read on the right scale. To obtain an accurate fuel rate measurement, the flowmeter reading must be corrected based on the fuel temperature. There is a fuel tem- perature gauge on the front panel of the fuel measuring device. The gauge is graduated in percent of error by which the reading requires correction. An example is: The fuel of an en- gine reads 125 lbs/hr on the flowmeter, and the temperature gauge reads +2 percent; the cor- rected fuel flow rate will be 125 plus 2 percent, or 127.5 lbs/hr.