Orma, The new bigger, boosted engine may require much more fuel than before. Perhaps the existing fuel system can't supply the need. Just an idea. Here are some conversions if they will help. I use some vacuum transducers at work, a quick ref is -15psi = -30"hg, (approx 1/2psi per "hg)
Best Regards, Riley Collins Rutledge, TN 1 inHg @ 0° C (inch of mercury) = 0.491159 PSI 1 inH20 @ 4° C (inch of water) = 0.036127 PSI 1 MHg (micron of mercury) = 0.0000193368 PSI 1 mmHg (millimetre of mercury) = 0.0193368 PSI 1 A (atmosphere) = 14.6960 PSI 1 b (bar) = 14.5039 PSI 1 lb/ft2 (pound per square foot) = 0.00694444 PSI
