Hi Chris, thanks for your response. My injector pump is actaully fine, but I need to change a boost diaphragm. As 90s, especially those with 19j engine, are not very common in my country, I was told by diesel mechanics that the only way they can identify the diaphragm is through the injector pump number. I was digging something out of internet yesterday, and hopefully found what I was looking for. I'll know the answer today. Thanks again.