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3.5 Fuel Consumption Measurement
When purchased with the ‘Fuel Consumption’ option the EGM Series flow meters are well
suited to the measurement of fuel consumption on injected diesel or petrol/gasoline
combustion engines. The flowmeters should be purchased and installed in pairs; with
flowmeter ‘A’ installed prior to the inlet side of the fuel rail or injection pump, and flowmeter
‘B’ installed immediately after the fuel rail or injection pump – as per the diagram below.
Electrical installation in a fuel consumption system is detailed in section 4.4.3
Before installing your flowmeters it should be confirmed that they are suitable for the
flowrate of the primary fuel pump, which will be significantly higher than the fuel consumption
rate reported in the engine datasheet. As an example, an average 500HP marine diesel engine
may have an approximate consumption of around 50L/Hr of diesel fuel but will have a fuel
system flowrate of around 300L/Hr – check your meter specifications against the higher fuel
system flowrate before installing.
Fuel consumption flowmeters should be installed according to the requirements in other
sections of this manual; the inlet side of Flowmeter ‘A’ should be fitted with a strainer or filter
of appropriate size (see specification table, section 1.2) - your existing fuel filter may be
suitable if the filtration level meets the flowmeter specification. If your existing fuel filter is
engine-mounted, it may be more practical to install the flowmeter prior to the fuel filter and fit
a y-strainer to the inlet of flowmeter ‘A’.
Due to the vibrations caused by a running engine it is recommended to avoid mounting the
flowmeters directly to the engine. To ensure complete filling of the flowmeters it is best to
mount them at a location which is physically lower than surrounding fuel lines.
Injected
Engine
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