I am new to the IV-P community and have recently completed my training w/ Pete Zagganino (excellent).  I am not a builder and purchased the airplane last year and have updated it to all modern standards.  I have a very concerning problem that I can not seem to get an answer on. It relates to vapor lock.  I have now experienced a partial engine shutdown as I switched tanks), and always on the left tank.   I was told to change the fuel selector to the new Andair System which I did and the problem persists. The problem occured once at low altitudes without changing tanks, and the other two times have been at 15,500 or more w/ low boost on.  It is quite alarming to say the least given this last episode (today) occurred over Moab.  I can’t seem to get an answer on how to mitigate the problem.  Can anyone help? 

My name is David Nassar and I live in Boulder, CO.  Thank you in advance.  303-775-5502