Does a mustang gt 2001 have more power when you take off a fuel rail schrader valve cap?
The schrader valve is a pressure relief valve in your fuel rail.If you need to release fuel pressure to change a part(fuel pump,fuel line)depress the valve and the fuel in the rail will spill out.You can also check fuel pressure @ the rail w/ a pressure gauge or install a gauge you can monitor your fuel pressure constantly.Removing the cap will do nothing.