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FFM100 User’s Manual
Figure 2 - M4ARP-2-E8 Typical Accuracy and Pressure Loss
1.6.3 Diesel Fuel Flow Measurement
Most diesel engines do not use all of the fuel that is supplied to them by the fuel pump via the
supply line. A portion of the fuel is consumed by the engine, but the majority of the fuel is used
for cooling the injection system and returned to the fuel tank via the return line.
For diesel engines, the FFM100 will operate in its differential mode, and will measure the net
fuel consumption of these engines by separately measuring the fuel sent to the engine via the
supply line and the fuel returned to the fuel tank from the engine via the return line. The
difference between these two readings is the fuel consumption of the engine. Please refer to
Figure 3 below for a system diagram demonstrating the location of the supply and return fuel
flow sensors in a diesel fuel system.
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