Re: Starting new C172s

On Thu, 08 Sep 2005 00:30:25 GMT, OP <OLP@xxxxxxx> wrote:

snip

>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?

The method described (WOT, ICO, boost pump on) is used to clear a TCM
classic fuel injection system, which will have a return line. If the
"aircraft manufacturer" is using an engine/s with this type of fuel
injection, it will have a return line/s. It can be important on some
aircraft to know how many "return lines" are present, and which tank/s
they are connected to.

A RSA/Bendix system will not have a return line. On the airframes that
I am allegedly familiar with, running the boost pump in this manner
will not accomplish much. But if it makes you (collective you) feel
better, go for it.

The typical RSA/Bendix "hot start" issue is not vaporised fuel in the
pump/lines causing a too-lean start, it is the fuel "boiling" out of
the hard injector lines into the engine induction system along with an
over-zealous application of boost pump-throttle-mixture to over-prime
an engine that often doesn't need priming at all.

I've never personally seen a Lycoming with a TCM classic system, but
there are a few TCM's flying around with RSA/Bendix systems.

TC

snip
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