have recentley refited baileys to gsi running eds 3.5 , the dump valve will dump if reved up when stationary but will not when driving except for when first accelerating through each gear. it does not seem to like m-way driving either as it dumps all over the place when ever it wants. also went and brought a collins one thinking it was the dump valve playing up but this ones the same. its t pieced into the fuel reg vac line same as boost gauge which works fine.its got a one way halfords valve near the turbo dump valve.
any one had this problem before?