Today's Message Index:
----------------------
1. 04:13 AM - Too high fuel pressure (Hans J. Danielsen)
2. 06:46 AM - Re: Too high fuel pressure (Brian Davies)
3. 08:16 AM - 912 compression (William Daniell)
Message 1
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| Subject: | Too high fuel pressure |
Hi all,
On starting my Europa after an idle peiode of two months the fuel
pressure went sky high as soon as I switched on the main fuel pump, (10
PSI). When switching on secondary pump the pressure went further up to
15-16 PSi.
My engine is a 914, and the pressure had risen increasingly higher (from
normal green indication) - up to 6-7 PSi - during the flight test
periode. I suspected the fuel pressure sender/instrument to be at fault,
but after connecting an auxilliary pressure instrument to the Fuel
Pressure Indicator it confirmed the high pressure. So instrument snag is
ruled out.
I disconnected the fuel return and connected a hose to let return fuel
into a can and all indications went back into the green band when
switching on the main. On switching both pumps on there was no further
pressure increase - which is normal with my in-series system.(The flow
into the can was surprisingly high - 20 liters in 7- 8 minutes!)
Suspecting a clogged fuel return I blew through the return hose - and we
could clearly hear bubbling fuel from the tank opening. Now, this should
indicate that the return is functioning ok, or????
But when fitting the fuel return again: same high indications.
Now I'm running out of ideas - and to all you wizards out there: Can it
be the Fuel Pressure Regulator which is at fault?
By the way: The engine starts and run beautifully and there is no
dripping or other indications which should indicate override of the
float valve of the carburetors.
Any one been there?? Ideas greatly appreciated!
Cheers
Hans, LN-HJD, #334
Message 2
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| Subject: | Too high fuel pressure |
I have a very different setup to yours (Rotax 912S) but I have had
indications of high fuel pressure recently with no other adverse sysmptoms.
I found I had a high resistance connection to the fuel pressure transmitter.
Wiggled the connector (spade type) and the problem went away.
Regards
Brian Advies
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Hans J.
Danielsen
Sent: 15 October 2010 11:20
Subject: Europa-List: Too high fuel pressure
Hi all,
On starting my Europa after an idle peiode of two months the fuel pressure
went sky high as soon as I switched on the main fuel pump, (10 PSI). When
switching on secondary pump the pressure went further up to 15-16 PSi.
My engine is a 914, and the pressure had risen increasingly higher (from
normal green indication) - up to 6-7 PSi - during the flight test periode. I
suspected the fuel pressure sender/instrument to be at fault, but after
connecting an auxilliary pressure instrument to the Fuel Pressure Indicator
it confirmed the high pressure. So instrument snag is ruled out.
I disconnected the fuel return and connected a hose to let return fuel into
a can and all indications went back into the green band when switching on
the main. On switching both pumps on there was no further pressure increase
- which is normal with my in-series system.(The flow into the can was
surprisingly high - 20 liters in 7- 8 minutes!)
Suspecting a clogged fuel return I blew through the return hose - and we
could clearly hear bubbling fuel from the tank opening. Now, this should
indicate that the return is functioning ok, or????
But when fitting the fuel return again: same high indications.
Now I'm running out of ideas - and to all you wizards out there: Can it be
the Fuel Pressure Regulator which is at fault?
By the way: The engine starts and run beautifully and there is no dripping
or other indications which should indicate override of the float valve of
the carburetors.
Any one been there?? Ideas greatly appreciated!
Cheers
Hans, LN-HJD, #334
Message 3
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Does anyone know the correct minimum cylinder compression readings for
a 912 (80hp)?
thanks
Will
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