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This video is all about fuel pressure regulators. How they work, how the vacume hose changes the pressure and why it does. Finally it explains how to adjust and calibrate an adjustable fuel pressure regulator. All this was done in an open engine bay of a Lotus 7 with a 4age Blacktop 20v in it. Enjoy. Rex from Inglewood New Zealand. Check out two Facebook groups that i lead: 4age New Zealand and Lotus 7 New Zealand.