I have the M-Tuned fuel rail mocked up on my '99 head, but have to return the fuel ('95 car), so can I orient my FRP upside down like so? (I don't think there's a problem, I just want to make damn sure before I run it like that.) If I flip it the other way, I have to rotate it a little so that the fuel line fits, but that causes the vacuum line to get kinked against the back of the manifold. Doesn't fit horizontally either. Makes me wish BEGi had gotten their intake manifold done already.

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It's just an o-ring seal right? I don't see why orientation would matter.

On this note, I'm chasing down a vacuum leak that sounds like it's coming from my FPR. If it's just an O-ring, I could easily replace it. Will search for part number.

I was afraid it might be the #4 injector lower seal, but the sound remained after I swapped in the 460cc units. It almost sounds like it's coming from the CAS sometimes, but I don't know how the CAS would make a sucking, squeaky noise.

brake cleaner (flammable stuff) does wonders for finding vacuum leaks.

Yup, just an o-ring. Like I said, didn't think it would, but want to make sure.

Also, all the FPR has to see is vacuum off the manifold right? If you noticed, I deleted the FPR solenoid, (actually I reused it as my VICS solenoid since that one was broken), but want to make sure I have it routed properly.

Do what Brain said, spray at individual areas until it causes the idle to roughen and then narrow it down. It's probably a vacuum line that has split. If your FPR o-ring was the issue, it would be leaking fuel.

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That's what I thought as well, but I guess I'm one-tracking my diagnosis because it sounds like it's coming from within the FPR.


I will do this. Proper diagnosis has to be better than paranoia and a set of ears.

Thanks guys.