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Interesting issue. Once you mentioned that it may be a primer line, it got me looking a little deeper. In fact when the new engines were put in 500 hours ago, they hooked the manifold pressure guage tube that comes out of the firewall into the "T". From there the "T" feeds into both manifolds (which is actually supposed to feed the primers).
Meanwhile they hooked the other tube (the primer) that comes through the firewall (righ above the pressure guage tube) to the single fitting which feeds into the manifold at the throttle body.
So it all worked, except it was one line priming, and two lines sensing the manifold pressure.
No wonder we couldn't find the dual manifold pressure lines in the manuals.
Now we need the right side primer line, but I would like to replace them all. If anyone has a lead on the pipe in lengths, it would be appreciated.
Thanks for the help
R.
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