It seems to me that the fuel would have to be pretty hot for the vapor pressure to exceed 40 psi and cause vapor lock. Running the fuel pump in such a case would cause coller fuel to flow through the rail and back to the tank.
-----Original Message-----
From: Al Gietzen <ALVentures@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, Dec 27, 2010 3:49 pm
Subject: [FlyRotary] Fuel rail pressure
Also remember that when you are starting the engine you are starting it under a load. This is different then in a car config where in a car you are starting it with no load attached to the crankshaft. If the fuel rails are getting so hot that they are vaporizing I would think this would cause an excess pressure in the fuel system and be very dangerous. This is not a problem I have ever had in a car. What is causing this besides poor ventilation?
The pressure in the fuel rail can never exceed the setting of the pressure regulator; which should bear about 40 psi engine off. That’s true even if you call the e-shaft a crankshaftJ.
Al