•  To keep the return fuel pressure of the injector within a certain range and precisely control the fuel injection amount and timing, the return fuel pressure is adjusted by the fuel check valve and fuel feed valve (lower case).

•  The check valve and feed back valve cannot be removed or inspected as a single unit. If replacing, replace the lower case.

•  If there is a malfunction in the check valve or fuel feed valve, an output decrease malfunction may appear due to the possibility of insufficient fuel injection.

•  Not applicable

•  Not applicable