<VV> Crankcase level rising

[Doug Mackintosh]

Thanks to those who responded (Chuck S, Rick Loving, JR, Roger Gault, Tony) to my questions about rising oil level.
   
  Per my advisors I checked for evidence of leakage at the carbs (none evident) and I verified that the fuel pump screws were tight. When I removed the pump there was clear evidence that it was leaking (wet underneath toward the rear and fuel in the ID of the pump stem and in the hole in the oil filter adapter).

  So I've replaced the pump and changed the oil (drained and reinstalled the filter). Assuming the level stops rising, I'll call it fixed.
   
  I have not yet dissected the pump (which was purchased in 2003 from a trusted vendor). I have contacted the vendor prior to starting any dissection. If I figure out the cause I'll post to the list for info.
   
  -----Original Message-----
  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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