HOW DO YOU INSTALL THE PRESSURE LINE ON THE FUEL RAIL it dont look like the nipple comes off so can anybody help thanks

 

Might want to mention what year car you are talking about. For a 4th Gen LT1, the following is valid:

By "nipple", I assume you mean the Schrader valve fuel pressure test connection... and no, it "don't come off".

Take the plastic cap off. Remove the valve core using a tire valve core tool (hold a rag over it, fuel will spray out). Attach a -4AN braided hose. Do not over-tighten.... the "nipple" will break off very easilly.

If you want to do a neater job, get an NOS part # 17535 -4AN 90deg "swivel" fitting. That will point the connection away from the cowl, and allow you to tighten it facing in any direction, without worrying about over-tightening.

Depending on what kind of fuel pressure gauge you are talking about, you may have to convert to a 1/8" NPT female thread.

courtesy of Shoebox:

http://shbox.com/1/fp_reg.jpg