Injector Services Having problems with your fuel Injectors which are making your vehicle use more gasoline, running poor on idle or take off can now be tested and serviced at Napa. Before the injectors are serviced they are tested to find out exactly what the cause of problems are in a special injector tester shown here on the left. There are two main parts on a injector, the o-rings on the outside for sealing and on the inside a filter which most often clogs due to fine dust or rust particles loosening from your fuel tank. When the fault is found the injectors are cleaned, repaired and tested again for assurance. A report of our findings will be provided to each customer. Coming soon!