how can i abjust fuel pressurre from regulator.
i connect gauge to see the pressure and it si 3.8 bar without pipe.
i should down pressure to 3.5 bar without pipe from regulator.
can i abjust pressure on cold engine, and i should abjust bolt at the top of regulator.What direction is down the pressure clockside or anti clock side ?

 

The engine needs to be idling at the correct speed, so in all probability a warm engine.
Turn the screw counter cockwise to lessen the pressure, clockwise of course then to increase, don't worry about turning it they are not sensitive and will need a noticeable turn.
At idle/tickover you can't do any damage, so adjust away, just be sure to plug the end of the vac pipe with a bolt etc that you remove from the pressure reg.
tabetha

 

i set the pressure at 3.5 bar at hot engine at 1000rpm with pipe off from regulator and push the pipe with hand.

 

Would it be favourable to check fuelling at tuner after turning fuel pressure down?

 

So long as the pressure is what the author of the chip has asked for will be ok.
tabettha