Servicing and testing diesel fuel injectors is a decently complicated process. Sure, there are a lot of types of diesel fuel injectors but we typically see two main types: mechanical (older) injectors which are less complex and common rail injectors that are more sophisticated. One important note: common rail injectors can't handle poor quality fuel very well (which can be the source of problems). We see people upgrade their injectors all the time and then continue running the same diesel they've always run. If you're doing an upgrade, you need to look at upgrading your fuel quality too.
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