[Brianjr03]

ive got a question for those of you that have made a railcap out of a lug bolt from a volkswagen. did you just unbolt the banjo bolt and replace it with the lug bolt? if so what did you do to keep it from leaking? or how did you all install them, and keep them from leaking?

 

[bigreddodge18]

What do these rail caps do exactly anyways?

 

[cattlepuncher]

Sometimes the stock relief valve weakens and will bleed out rail pressure at too low of a range, zapping some power. Or guys crank up the pressure and want it to remain high.