Loose Injector

11178adm wrote:
on ISC8.3 CAPS pumps the injector has as previously mentioned has a crush washer to seal the injector from the combustion chamber the high pres fuel line feeds the injector through a quill tube that is held into the side of the injector with a nut in the side of the head, there is a oring near the top of the injector to seal any fuel that leaks between the quill tube and injector from leaking into the oil, there is a passage in the head that connects to a return line at the rear of the head. if one of the crush washers is leaking combustion gas would get into the return fuel and go back to the fuel tank. you might be able to verify this with a temporary clear plastic line installed in the fuel return and looking for air in the fuel but this type of leak usually will only show up on a hard pull. if the engine performs well probably all that would be needed would be the seals and orings. the compression seals are copper seals about 3/8 in long that sometimes stick in the head and can be difficult to remove. the leaking inj seal should have carbon accumulation above the compression seal area make sure to clean and examine the inj bore and the inj for erosion