I have original solex carbs on my 1975 2L kombi. On my recent trip around Australia, along with other work, I had my fuel pump replaced with a Pierburg 3-5psi lift pump model 721.440.51. All work done by Andrew (1500king/volkesdoktor) in South Austtralia. In addition a fuel cut off solenoid was added for safety and all re-plumbed. Pressure was then measured at the carbs of just under 6psi. This was much better than the flipping to ZERO the old pump was doing, and the likely cause of the lean running etc. Now I am back at home, and my usual mechanic pointed out that the pressure may be too high for the needle valves and seats (whatever they are). I did some googling, and for example on justkampers, their fuel pumps have a note that reads 'a fuel pressure regulator is recommended with these pumps'. I read that 2.5-3psi is what is needed. Other VW parts websites are selling things like the Malpassi Adjustable pressure regulator for my car. So - do I need to worry ?