Fuel Rate
Use fuel measuring device, Part No. 3376375, to mea-
sure the rate of fuel consumption. For more information,
refer to Procedure 8-02.
Install the fuel measuring device as follows:
• The fuel return hose from the engine to the fuel
measuring device (A).
• The fuel inlet hose to the fuel filter inlet (B).
• The return hose from the device (C) to the fuel tank.
• The fuel inlet hose to the device from the fuel tank
suction line (D).
NOTE: Adjust the fuel rate to compensate for temperature
variation if required. The fuel temperature must be between
15.5°C and 48.9°C [60°F and 120°F] for accurate
measurements.
Fuel Inlet Restriction
Measure the fuel inlet restriction. Install a vacuum gauge,
Part No. ST-434, between the fuel pump inlet and the
gear pump inlet.
NOTE: Do not measure fuel inlet restriction with the fuel
measuring device installed. This will not measure the inlet
restriction of the vehicle’s supply plumbing.
Hold the gauge at the same level as the gear pump.
NOTE: The gauge will not measure the correct vacuum if
the gauge is not held at the same level as the gear pump.
Engine Testing General Test Procedure - Chassis Dynamometer (8-06)
N14 Page 8-43
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