Your stock injectors will look a purpleish color.
To take the black ring off to gain access to the tank then ur pump u will need a bar and a hammer.Sit the bar a groove then keep beating it counter clockwise untill u get it open.It may take a while but it is by far the only way to undo it.And make sure u put it back on the same way it came off.(I used a car jack bar and hammer)
Get into this thread catchcan plumbing question it tells all u need to know,with pics too,about catch can plumbing and will also help u decide what style setup u need.