If your Zodiac
valves are leaking, check for sand or dirt in the valves. Clean with mild soap and water. Remove and inspect rubber o-rings and seals
, and replace if worn or cracked.
Evidently, the inner diaphragm
on semi-recessed valves or delrin valves was never intended to be airtight. It just keeps the air from rushing out while you install the outer plug
or cap. The valve is supposed to be airtight when the outer plug/cap is installed.
Inflate your boat to maximum pressure. You’ll need a shop or garage, somewhere indoors out of the wind
and sun. Get a spray bottle filled with water and dish soap dish detergent. Spray the entire boat, wait a few minutes and watch for bubbles. Some will appear large and grow quickly. Others may appear as small “creamers”. Mark these leaks
with a pencil or china
marker, something you can erase later.
Don’t worry to much about this very minor leak. Many of us have to pump more than 8 strokes, just to account for temperature changes.