I've heard that it's possible to increase fuel pressure in fuel injector by reducing the diameter of pipe which is used for fuel return from injector into fuel tank. The fuel pressure can be increased form 2,5 bar up to 4 bar (air pressure in injector is 5 bar).
Picture is attached.
Anhang: ajnspric2.jpg (44.74 kbyte)
Picture is attached.
Anhang: ajnspric2.jpg (44.74 kbyte)