Need help with a problem in our PA28-140

Prime wrote:
Oh and Mike, thanks for the water issue suggestions. Your explanation
would cover the symptoms we are seeing, I hadn't thought of that. We
will check it out. I do believe we replaced the tubing at that annual.
Are you suggesting that the old tubing may have leaked just enough to
trap the water, where previously it would have drained? What would be
different with new scat tubing?



As Jim said, the opposite is likely true. The old tubing was probably
beat up and perforated in several spots, thus letting the water OUT that
was leaking in from the airbox.

If you remove the nose cowling, I can almost guaranty some cracks in the
airbox. Hold the cowling upright in its normal position, spray water at
the front from a high up angle (mimicking rain), and look to see where
it runs. I'll bet it goes into cracks and out the round tube that
connects to the scat tube. All it takes is an ounce or two.

As I said, I had the exact same problem after replacing my main
induction scat tube. A little hole punched in the bottom cured it. Until
then, start it up with the carb heat valve opened half-way to prevent
the water from being sucked in on startup.

Good Luck,
Mike