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Needing the same thing, and not finding what I wanted in any catalog, I
proceeded as follows: (my carb didn't have the pressure tap available).

In my particular plumbing set-up, I had a 90 degree AN fitting at the
carburetor inlet - a  "-6" size if I remember (3/8 inch anyway). As with all
the other AN fuel fittings FWF, it was steel. I drilled a #60 hole in the
back of the elbow, in line and on the opposite side of the inlet hose. I cut
off about half of a "-2" fitting and shaped it to fit fairly closely over
the drilled hole - then I took both parts to a master welder at the field
and had him weld the half of the "-2" fitting to the "-6" making sure that
the drilled hole connected to the inside of the smaller fitting.

My thinking concerning the small (#60) hole was that if I should ever spring
a leak in the tubing to the pressure sensor, it should keep the leak small.
Plumbing to the sensor is 1/8 in. aluminum tubing with -2 Al fittings. The
whole thing is no more than 6 inches long and is severely clamped to the
sheet metal part on the carb that holds the throttle and carb heat controls
to eliminate any relative motion and flexing of the tubing in the hopes of
avoiding any flexure.

May have been the long way around, but I just couldn't locate such a part
anywhere. Has been working OK for 500+ hours.

Dan Schaefer



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Please send your photos and drawings to marvkaye@olsusa.com.
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