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New 912 Engine Starting Problem

 
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hgmckay



Joined: 23 May 2006
Posts: 397

PostPosted: Tue Sep 12, 2006 1:02 pm    Post subject: New 912 Engine Starting Problem Reply with quote

Gentlemen:
<![if !supportEmptyParas]> <![endif]>
After running my new Rotax 912UL in my Allegro 2000 for four successful trial runs, I decided to drain the main tank and refill it with new fuel. I drained the tank completely through the low point drain and refilled the tank about half full. When I tried to re-start the engine, it would not hit. It just turns over and over. Ignition is on, choke is on, and I am operating the electric fuel pump during the start sequence. I have tried three times to start the engine with the same result. I have done nothing different from the initial four runs other than draining the tank and refilling. Could I have a vapor lock or trapped air somewhere? I would think that the electric fuel pump would take care of air or a vapor lock in the lines between the pump and the carbs. Fuel bowls have stayed dry. Any suggestions how to find the problem, and correct it?
<![if !supportEmptyParas]> <![endif]>
Hugh McKay
Allegro 2000
N661WW
[quote][b]


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thilo.kind(at)gmx.net
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PostPosted: Tue Sep 12, 2006 1:18 pm    Post subject: New 912 Engine Starting Problem Reply with quote

Hi Hugh,

suggest to check the fuel lines to the carburetors with the electrical fuerl pumps running. Could be, that you are sucking fuel from the tanks to the electrical fuel pump. With the tank now half full (less pressure) you might create vapour lock in the suction line from tank to electrical pump.

Good luck

Thilo
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lostpilot28



Joined: 26 Jul 2006
Posts: 7
Location: Southern California

PostPosted: Tue Sep 12, 2006 1:34 pm    Post subject: New 912 Engine Starting Problem Reply with quote

Hi Hugh,
I typically run my electric fuel pump until my 2 psi fuel pressure light goes out plus about 5 seconds. This puts fuel in the float bowls and pressurizes the fuel lines. I've never had a starting problem. My guess is that you not only drained fuel from the tanks, but the lines as well (gravity fed back to the tanks).

Regards,
Sonny W.
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jkuehn(at)mountaintime.my
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PostPosted: Tue Sep 12, 2006 2:37 pm    Post subject: New 912 Engine Starting Problem Reply with quote

Try disconnecting the fuel lines at the carburetors, one at a time, and
turning on the electric pump briefly to clear the line. Make sure fuel
is flowing. I have had slow starting after draining things out, and I
do not think you have a real problem here, just no fuel getting to the
engine.

Jack

Hugh McKay III wrote:

Quote:
Gentlemen:



After running my new Rotax 912UL in my Allegro 2000 for four
successful trial runs, I decided to drain the main tank and refill it
with new fuel. I drained the tank completely through the low point
drain and refilled the tank about half full. When I tried to re-start
the engine, it would not hit. It just turns over and over. Ignition is
on, choke is on, and I am operating the electric fuel pump during the
start sequence. I have tried three times to start the engine with the
same result. I have done nothing different from the initial four runs
other than draining the tank and refilling. Could I have a vapor lock
or trapped air somewhere? I would think that the electric fuel pump
would take care of air or a vapor lock in the lines between the pump
and the carbs. Fuel bowls have stayed dry. Any suggestions how to find
the problem, and correct it?



Hugh McKay

Allegro 2000

N661WW

*
*



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Thom Riddle



Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

PostPosted: Wed Sep 13, 2006 4:28 am    Post subject: New 912 Engine Starting Problem Reply with quote

Hugh,

1) Is the fuel tank valve turned on? I know this is obvious but
sometimes we forget. I have
2) Are both mags on? I've forgotten this one too.
3) Does the fuel pressure gauge read in normal range with just the
electric boost pump on? It should with just the master on and the fuel
pump switch/cb on, and not cranking.
4) When you crank, does the fuel pressure change? With the engine
mechanical pump also doing its job, the fuel pressure reading should be
a little higher than with just the electric pump on.

If 3 & 4 are good, then you know you are getting fuel to the engine,
and the carbs, if there is no leak in the fuel system in the engine
compartment, which would be visually obvious with the upper cowl off.
This also means you are not getting vapor lock anywhere.

If the engine is cold, make sure that the choke is full on and the
throttle is completely closed. When cold the engine will not start if
the throttle is open even a little.

If it still won't start, remove the drip tray under one carb and then
the float bowl to see if the bowl has fuel at the proper level and the
float valve moves up and down okay. While you have the float bowl off,
check to see if the starting circuit jet is loose. The starting jet is
in the bottom of the little vertical cylindrical area in one corner of
the bowl. If it is loose it could affect starting mixture and if it
does start cause rough idling. Do this same thing for the other carb.
and then reassemble carefully making sure you get the bowl gaskets
seated properly.

If after trying all of this it does not crank, let us know and we'll
proceed from there.

Thom in Buffalo


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Thom Riddle
Buffalo, NY (9G0)



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