You tighten it until it doesn't leak. I recently installed a fuel pressure gauge on the schrader port. If your fitting doesn't have an o-ring, than use teflon tape. When I tightened up my fitting to what I thought was pretty tight, it leaked. So just tighten it up until it stops leaking, and check it once in awhile.
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87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sh*t.
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