The first think I want to try is circulating the fuel from the "center" fuel pump back to the tank instead of shutting it off.

Finn

Ed Anderson wrote:

Finn,

 

Per our conversation in Jan at LakeLand, I am 99% (well, 95%) convinced that your bubbles are indeed due to heating and not air leaks.  When are you going to do a temp reroute of your fuel line away from the bottom of the aircraft? 

 

Ed A

----- Original Message -----

From: Finn Lassen

To: Rotary motors in aircraft

Sent: Sunday, February 13, 2005 8:23 PM

Subject: [FlyRotary] Re: Vapor lock in sump/header tank.

I'm beginning to think that it takes very little heating to get vapour on the suction side of the pumps. Probably especially with auto gas. The lower the pressure, the lower the boiling point, right?

Finn (still have not tried returning fuel from the "unused" pump to the tank)

Ed Anderson wrote:

 In Paul's case, I am not certain it was vapor lock since he mentioned he found the his header tank cool to the touch.  Certainly not a definitive temperature sensor - but a reasonable one.  Certainly not to be discounted as a possible source of the problem and it possibility needs to be confirmed or eliminated.