Hi
If i was to fit an adjustable fuel pressure regulator with a walbro pump could i turn the pressure up to 3.5 bar safely even with the standard rubber fuel lines?

 

I run 4 bar and have done for 2-3 years with no problems. Remember you need to have the vac hose off and set it that way. Also depending on the fpr it might not take that when you add the boost pressure to it. Do you know you really have to remap for differing fuel pressures as it alters the amount of fuel going into the injectors etc