or for those of you who like to keep things simple -- turn it on after start and turn it off before shut down.

 

Jeff

1200+ hours on a boost pump

 

Vapor lock in a fast climb to altitude is a common problem in TC'd aircraft and can even be a problem in high performance NA aircraft.  That's why we recommend turning on the boost pump in most of these applications as one passes through 10,000 feet in a climb.  We also recommend leaving the boost pump on for at least 30 min. after reaching cruise altitude so the fuel in the tanks can cool off and will no longer be subject to vapor lock.  Vapor lock essentially leans the mixture and will be noted by a rising EGT/TIT in the climb--even wit the mixture remaining full rich.

Walter

On Mar 13, 2009, at 5:07 AM, farnsworth wrote:

 

Dr Katz,

 

About a year ago I had a similar problem with fuel flow reduction during climb. It would cause increased temperature problems at the same altitudes (14 to 15,000’).

 

It turned out that I needed to have my fuel pump recalibrated by TCM in Mobile. During this period I found I could increase the fuel flow about 5 GPH by turning on the high boost pump. You might want to turn on the high boost pump around 12,000’ and see if this doesn’t allow you to climb above 14,000’ without the CHTs going up.

 

Lynn Farnsworth

Super Legacy #235

TSIO-550 Powered

Race #44

=