Starting new C172s

On Wed, 7 Sep 2005 09:35:59 -0700, "Matt Barrow"
wrote:


Note added 06/06/02: Later data strongly suggests the boost pump be run on
the highest setting for AT LEAST 60 full seconds, by the clock, and 90
seconds is better.
The electric boost pump is usually located somewhere outside the engine
compartment, and thus has no problems with bubbly fuel. What you're doing
here is to circulate cool fuel into and through the engine-driven fuel pump,
up to the fuel control unit, and then back through the vapor return lines to
the fuel tank. The idea is that when you do crank the engine, the
engine-driven pump will really pump liquid fuel, and not starve on bubbles.
A normal start should result. While cranking, you might need a quick shot on
the boost pump to help the cold fuel get beyond the fuel control unit, and
blow out the lines to the fuel distributor ("spider"), and the tiny lines to
each cylinder. But make sure it's really quick, otherwise you risk flooding
the engine.


I had read of this method for starting a hot fuel injected engine,
but the article I read didn't say anything about which fuel injected
engines had the return to the tank line. Does this apply to "all"
fuel injected engines of the Lycoming/Continental types, flat
four/sixes in all aircraft? I guess my question is... is the vapor
return line common to all aircraft manufacturers?

Ron Kelley