<VV> Crankcase level rising

[Doug Mackintosh]

Need a little advice from all you experts! This is not intended to fuel the electric vs. mechanical flames, it's just a coincidence!!
   
  This all relates to my 1962 Monza 102 HP daily driver.
   
  I check my oil every time I refuel, and when I did so yesterday I found the oil level had increased and was well above the full mark. I also noted that my fuel mileage this tank was much worse than usual (depending on the weather and type driving I usually average between 19 and 24 MPG, this tank was around 14 MPG).
   
  I expect I have a leaking diaphragm in the pump overflowing into the crankcase. I replaced the pump with one purchased in 2003 from one of our vendors. The provenance of the old pump was unknown. The reason for pump replacement then was the same (crankcase filling up).
   
  I assume the current pump has the raised anti-flowback bump in the lower casting, so I would expect a leaking pump to squirt out the back relief slot and not flood the crankcase. However, I see no evidence of external leaks.
   
  Note that I just finished a tuneup about 200 miles ago, the car starts and runs beautifully, there are no external fuel leaks and I have no reason to think fuel is flooding the engine through the carbs (e.g. stuck float needles etc).
   
  Before I start tearing into it today I have two questions:
   
  QUESTIONS:
   
  1) Does anything other than a pump leak make sense as a cause of my crankcase level rising?
   
  2) If a pump leak is causing it, why is it not leaking out the external weep hole in the back of the pump?
   
  Thanks!


-- Doug Mackintosh
  Corsa member since 1996
  Corsa/NC member since 1996,  Virtual Vairs member
  Corvair owner 1969-1971 and 1996-on
 		
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