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<DIV><FONT face=Arial size=2>Mike, first I would NOT ""T the return into the
supply line. This could cause problems. </FONT></DIV>
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<DIV><FONT face=Arial size=2>Somewhere between the tank and pump you must have a
pinhole air leak, there is no other way air could get into the line. Check
carefully (pressure test if you can) the dip tube, perhaps there is a pin hole
there. You may be able to take out the dip tube, cap off the line at the
pump (output side) and pressureize the dip tube. Then look for any
bubbles. Someone else in Bahamas last year had the exact same problem and
it turned out to be a pin hole in the top of his filter. He found it by
the pressure test method. Replaced with my spare RACOR and his problem
disappeared.</FONT></DIV>
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<DIV><FONT face=Arial size=2>Bob Chambers</FONT></DIV></BODY></HTML>