#Diesel return flow tester install#
Install valve through banjo fitting and into pump.The other is located between the banjo fitting and end of valve. One gasket is located between pump and banjo fitting. The valve has no internal serviceable parts and must be replaced as an assembly. It connects the fuel return line (banjo fitting) to the pump. The overflow valve (pressure relief valve) is located at the outside of fuel injection pump. Install valve through banjo fitting and into pump.ġ0. Reduce regulated air pressure to 10 psi and observe valve. Internal check valve should release, and air should pass through valve at 97 kPa (14 psi). Using blow gun, apply pressure to overflow valve inlet end (end that goes into injection pump).Ħ. Set regulated air pressure to approximately 97kPa (14 psi).ĥ. Remove valve from pump and banjo fitting.Ĥ. Clean area around overflow valve and fuel return line at injection pump before removal.Ģ.
#Diesel return flow tester code#
If a Diagnostic Trouble Code (DTC) has been stored for decreased engine performance due to high injection pump fuel temperature, the overflow valve may be stuck in closed position.Ī rubber tipped blow gun with regulated air line pressure is needed for this test.ġ. If the check valve within the assembly is sticking open, fuel drainage of the injection pump could cause hard starting. The Max P213 piston flow meter is our most popular gasoline and diesel flow meter offering 1000+ pulses per ml. The valve opens at approximately 97 kPa (14 psi). With their high resolution and low flow measurement accuracy, Max Precision Flow Meters are the leading choice for both dynamometer and over-the-road testing. Approximately 70% of supplied fuel is returned to the fuel tank. The overflow valve (a check valve) is used to route excess fuel through the fuel return line and back to the fuel tank. It is also used to connect the fuel return line (banjo fitting) to the fuel injection pump.įuel volume from the fuel transfer (lift) pump will always provide more fuel than the fuel injection pump requires.
The Bosch VP44 Injection Pump Overflow Valve is located on the side of the injection pump.
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