What are the timing marks to install injector pump on Isuzu 4bd1 engine?

To install the injector pump on an Isuzu 4BD1 engine, align the timing marks on the pump with the timing marks on the engine. Typically, the pump drive gear has a mark that should be aligned with a corresponding mark on the engine's timing cover. Additionally, ensure that the crankshaft is at top dead center (TDC) on the compression stroke of cylinder one. Proper alignment is crucial for optimal engine performance and to avoid timing issues.