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Fuel Pump

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Bernhard10

Joined: 25 Sep 2006
Posts: 21

Posted: Sun Jul 22, 2007 4:06 pm Post subject: Fuel Pump

I have an Allegro 2000 LSA with a 912UL. 50 hours TT

When I switch off the auxiliary electrical fuel pump the instrument reading drops to nearly 0 before coming up again very slowly but doesnâ€™t read quite 0.2 with the mechanical pump. This happens in flight.

On the ground during or before run up the reading drops less to about 0.15 with mechanical pump only. seem awful low though ??



Is this a reason for concern ??



Thanks

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Gilles.Thesee(at)ac-greno
Guest

Posted: Sun Jul 22, 2007 4:35 pm Post subject: Fuel Pump

 	  Quote: 	
		   When I switch off the auxiliary electrical fuel pump the instrument reading drops to nearly 0 before coming up again very slowly but doesnâ€™t read quite 0.2 with the mechanical pump. This happens in flight.

 On the ground during or before run up the reading drops less to about 0.15 with mechanical pump only. seem awful low though ??

   


	


Please give us more details :



- What instrument ? Fuel flow, fuel pressure ?

- What type instrument ? Dial gauge ? EIS ?

- What units are you using ?

- Where are the sensor(s) located ? What type ?

- What fuel supply architeture ? Return line ? Low wing tanks ? High 

wing tanks ? Fuselage tank?

- What type of fuel lines, metal, hose ? Length ?

- Etc..



Regards,

-- 

Gilles Thesee

http://contrails.free.fr

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Bernhard10

Joined: 25 Sep 2006
Posts: 21

Posted: Sun Jul 22, 2007 6:17 pm Post subject: Re: Fuel Pump

Sorry can't answer all questions right now but here is what I have:



Instrument: Fuel pressure

 Type;  Dial Gauge

Fuselage Tank



All other parameters I have to check next time at the airport.

Thanks

Bernhard

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Thom Riddle

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

Posted: Mon Jul 23, 2007 2:27 am Post subject: Fuel Pump

Bernhard10,



The 912UL engine needs the minimum fuel pressure specified by Rotax to 

keep the float chambers at the correct level under normal flight 

conditions. If it does not get the required fuel pressure and the float 

level starts dropping, the engine will begin to lean out and will quit 

when it no longer gets sufficient fuel. If this is a condition you want 

to avoid (I certainly would) then this would be cause for "concern".



It is possible that your fuel pressure gauge is bad (unlikely in my 

opinion). It is also possible that your mechanical fuel pump is bad 

(more likely in my opinion). In either case I would check out both of 

them before flying again.



It seems you are looking for someone to tell you this is not a problem 

because you asked the same question on the Allegro List to which I 

responded in a similar fashion. You may actually find someone to tell 

you that. If you keep looking you probably will. Good luck with your 

search for a Pollyanna. Fuel starvation for various reasons is the 

number one cause of power loss accidents in the NTSB accident report 

database.



Thom in Buffalo

FAA Powerplant Mechanic

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_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
- Anonymous

Gilles.Thesee(at)ac-greno
Guest

Posted: Mon Jul 23, 2007 2:51 am Post subject: Fuel Pump

Bernhard10 a écrit :

 	  Quote: 	
		   



 Sorry can't answer all questions right now but here is what I have:



 Instrument: Fuel pressure

  Type;  Dial Gauge

 Fuselage Tank

   


	


Bernhard,



The 912S installation manual  is really worth downloading from 

http://www.kodiakbs.com

It states that the nominal fuel pressure is 0.3 bar,  and should stay in 

the 0.15-0.4 bar range (2.2-5.8 psi for the metrically challenged  

The units are always printed on the gauge dial.



Regards,

-- 

Gilles Thesee

http://contrails.free.fr

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Savannah174(at)msn.com
Guest

Posted: Mon Jul 23, 2007 5:07 am Post subject: Fuel Pump

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Bernhard, one more point of fact added to Thom's response and that would be  you should go to www.Rotax.com and read the service bulletin on  the 912 fuel pump your model number may be in question

  

 R.J. Roy

 [quote]   ---

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Savannah174(at)msn.com
Guest

Posted: Mon Jul 23, 2007 6:02 am Post subject: Fuel Pump

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  SORRY FOR THE ERROR  www.rotax.owner.com

 [quote]   ---

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