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simple pressure gauge can be calibrated in fuel flow in gallons per hour and be employed as a flowmeter. Engines modified with turbosuperchargers must use shrouded nozzles. By the use of an air manifold, these nozzles are vented to the injector air inlet pressure. 

## Continental/TCM Fuel-Injection System 

The Continental fuel-injection system injects fuel into the intake valve port in each cylinder head. [Figure 2-39] The system consists of a fuel injector pump, a control unit, a fuel manifold, and a fuel discharge nozzle. It is a continuous-flow type, which controls fuel flow to match engine airflow. The continuous-flow system permits the use of a rotary vane pump which does not require timing to the engine. 

## Fuel-Injection Pump 

The fuel pump is a positive-displacement, rotary-vane type with a splined shaft for connection to the accessory drive system of the engine. [Figure 2-40]  A spring-loaded, diaphragm-type relief valve is provided. The relief valve diaphragm chamber is vented to atmospheric pressure. A sectional view of a fuel- injection pump is shown in Figure 2-41 . 

