502 ramjet fuel pressure

[Matty B]

Your fuel pressure is fine well within spec, however with only that much drop when the vaccum is hooked up ~6 psi that means you only have about 6 in vaccuum at idle. I higghly suspect you have a vaccuum leak of some sort from the sounds of it. Id say go through it again and recheck it. IIRC the MAP sensor is underneath the plenum and if it it hooked up with a hose thats a possible spot for a leak and also why the motor could be running wrong ie down on hp and such. Id check there and report back, I saw this happen on a 210 with this motor at the shop and once we put a new piece of tubing on it, it ran perfectly. hope this helps.