Engine Testing - General Information Section 14 - Engine Testing - Group 14 M11 Page 14-6 Operation This is a schematic of the fuel measuring device, Part No. 3376375. The device con- sists of the following components: Fuel Filter Flowmeter Float Tank Fuel Rail Pressure Gauge Fuel Cooler is not a part of fuel measuring device, Part No. 3376375; however, must be used when conducting test with the flow meter. The fuel measuring device recirculates return fuel to the engine fuel inlet by routing the return fuel to the top side of the float tank. The fuel is deaerated as it passes through the baffling in the float tank.
A ball float valve at the bottom of the float tank maintains an ad- equate volume in the tank for deaeration. The fuel is then returned to the engine fuel inlet. Refer to the sketch for fuel line connection points on the fuel measuring device. 1. Fuel Supply From Tank 2. Fuel Flow to Fuel Meter 3. Fuel Flow From Fuel Meter 4. Fuel Flow to Fuel Cooler 5. Injector Return Fuel 6. Fuel Rail Pressure Note: The fuel supply tank must be below the level of the fuel measuring device to pre- vent overflow of the float tank.
If an overhead fuel supply tank is used, a float controlled reservoir must be installed between the fuel supply tank and the fuel measuring device, and below the level of the device.