Starting Engine Question (O-320, Warrior)

Lisa wrote:
My question refers to Warrior IIs, but could be about other
Lycoming O-320 and O-360 engines with electric fuel pumps too.

I've noticed checklists on some Warriors tell you to turn the
electric fuel pump ON and leave it on for starting, and others
tell you to turn the fuel pump ON, check pressure, then OFF
before starting.

The actual P.O.H. I've seen says to turn the fuel pump on before
start but doesn't even mention to check the fuel pressure to make
sure that the electric pump works. It doesn't say when to turn
the fuel pump off, except during the run-up to turn it off so the
pressure can be checked. All in all, the checklists in the
actual P.O.H. aren't very impressive and seem to leave a lot of
important stuff out. They don't even remind you to shut off the
cabin heat/defrost before starting to protect you in case there
is a fire during start.

So why the different schools of thought? It doesn't seem
necessary to leave the pump on for taxi, as the POH suggests.
But should the fuel pump be on while cranking? What does
everybody do?


As per our club's cheklist, it goes:

-- Pump on
-- Pressure in the green arc
-- Pump Off
-- Throttle - set for 1000rpm
..
..
etc.


I like it for two reasons.. The POH in our aircraft state the electric
fuel pump is a redundancy in case of mechanical fuel pump failure...

May as well check it as early as possible in the start, rather than wait
for run-ups or after t/o to realise you have an unserviceable unit.

Checking the electric fuel pump during start checks - for the same reason..

Cheers,
NCM

"Lisa" wrote in message ...
My question refers to Warrior IIs, but could be about other
Lycoming O-320 and O-360 engines with electric fuel pumps too.

I've noticed checklists on some Warriors tell you to turn the
electric fuel pump ON and leave it on for starting, and others
tell you to turn the fuel pump ON, check pressure, then OFF
before starting.

The actual P.O.H. I've seen says to turn the fuel pump on before
start but doesn't even mention to check the fuel pressure to make
sure that the electric pump works. It doesn't say when to turn
the fuel pump off, except during the run-up to turn it off so the
pressure can be checked. All in all, the checklists in the
actual P.O.H. aren't very impressive and seem to leave a lot of
important stuff out. They don't even remind you to shut off the
cabin heat/defrost before starting to protect you in case there
is a fire during start.

So why the different schools of thought? It doesn't seem
necessary to leave the pump on for taxi, as the POH suggests.
But should the fuel pump be on while cranking? What does
everybody do?

the only reason for turning the pump on before start is to check the
pressure to ensure the electric pump is working. once the engine is running
there is no pressure difference when you turn on the electric pump so you
cant tell if its working. I turn it on before start, check the pressure
then turn it off before starting the engine. I turn it back just prior to
commencing take off run.
then turn it off again ( and check pressure again) at 500' AGL

Terry

I turn the fuel pump on until I get fuel pressure .. then turn it off. Then
I
start the engine and taxi. That way I can make sure the engine driven pump
is working. I use the electric pump
for takeoff, landing, and when changing fuel tanks.




"Lisa" wrote in message ...
My question refers to Warrior IIs, but could be about other
Lycoming O-320 and O-360 engines with electric fuel pumps too.

I've noticed checklists on some Warriors tell you to turn the
electric fuel pump ON and leave it on for starting, and others
tell you to turn the fuel pump ON, check pressure, then OFF
before starting.

The actual P.O.H. I've seen says to turn the fuel pump on before
start but doesn't even mention to check the fuel pressure to make
sure that the electric pump works. It doesn't say when to turn
the fuel pump off, except during the run-up to turn it off so the
pressure can be checked. All in all, the checklists in the
actual P.O.H. aren't very impressive and seem to leave a lot of
important stuff out. They don't even remind you to shut off the
cabin heat/defrost before starting to protect you in case there
is a fire during start.

So why the different schools of thought? It doesn't seem
necessary to leave the pump on for taxi, as the POH suggests.
But should the fuel pump be on while cranking? What does
everybody do?

Lisa, go to http://www.lycoming.textron.com/supp...ons/index.html for the
straight skinny from the engine manufacturer.

Bob Gardner

"Lisa" wrote in message ...
My question refers to Warrior IIs, but could be about other
Lycoming O-320 and O-360 engines with electric fuel pumps too.

I've noticed checklists on some Warriors tell you to turn the
electric fuel pump ON and leave it on for starting, and others
tell you to turn the fuel pump ON, check pressure, then OFF
before starting.

The actual P.O.H. I've seen says to turn the fuel pump on before
start but doesn't even mention to check the fuel pressure to make
sure that the electric pump works. It doesn't say when to turn
the fuel pump off, except during the run-up to turn it off so the
pressure can be checked. All in all, the checklists in the
actual P.O.H. aren't very impressive and seem to leave a lot of
important stuff out. They don't even remind you to shut off the
cabin heat/defrost before starting to protect you in case there
is a fire during start.

So why the different schools of thought? It doesn't seem
necessary to leave the pump on for taxi, as the POH suggests.
But should the fuel pump be on while cranking? What does
everybody do?