A fuel injector is the use of an injector to introduce fuel into an internal combustion engine, which is the most used automotive engine. This article focuses on fuel injection in reciprocating and Wankel rotary engines. The fuel injector is one of the important parts in the engine. If any fuel injector is damaged, it could be checked by using diesel engine testing machine. Diesel engine testing machine helps to identify the exact problem in the fuel injector. This study is to find out the preference of Diesel Engine Testing Machine in India. There are several testing machines used by the workshop owner. The range of the testing machine used by the workshop owners. In this study we analysed whether the workshop owners can own a testing machine or not. The survey was collected from 26 workshops using a Structured Questionnaire. The data collected is analysed using statistical tools such as percentage analysis, frequencies and weighted average.