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914 Electric Fuel pumps

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Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Thu Jun 27, 2013 1:59 pm Post subject: 914 Electric Fuel pumps

Hi All.

The other day haven flown, I was sitting on the ground engine stopped, 

I was fiddling with the GPS for about 25 mins, trying to learn how to store a route, I had left both fuel  pumps running, ??

Heard the noise but it did not register, Crazy.

Any damage or problem I may have caused , pumps running engine stopped on ground about 25-30 minutes.



Alan

rlborger(at)mac.com
Guest

Posted: Thu Jun 27, 2013 2:10 pm Post subject: 914 Electric Fuel pumps

Hi Alan,



As long as your fuel selector is set for fuel flow and there's fuel flowing through the pumps, they are probably OK.  



If you ever run a pump without fuel flow through it, it will only last about a minute before it fails.  



The fuel flow is absolutely necessary to cool and lubricate the pump.



How was the flight?



Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com



On Jun 27, 2013, at 4:59 PM, Alan Carter <alancarteresq(at)onetel.net> wrote:






Hi All.

The other day haven flown, I was sitting on the ground engine stopped, 

I was fiddling with the GPS for about 25 mins, trying to learn how to store a route, I had left both fuel  pumps running, ??

Heard the noise but it did not register, Crazy.

Any damage or problem I may have caused , pumps running engine stopped on ground about 25-30 minutes.



Alan

daberti(at)sbcglobal.net
Guest

Posted: Thu Jun 27, 2013 2:28 pm Post subject: 914 Electric Fuel pumps

That may be if the pump is dry 



Dave Alberti 

262-853-5421



On Jun 27, 2013, at 5:10 PM, Robert Borger <rlborger(at)mac.com> wrote:



 	  Quote: 	
		   

 

 Hi Alan,

 

 As long as your fuel selector is set for fuel flow and there's fuel flowing through the pumps, they are probably OK.  

 

 If you ever run a pump without fuel flow through it, it will only last about a minute before it fails.  

 

 The fuel flow is absolutely necessary to cool and lubricate the pump.

 

 How was the flight?

 

 Blue skies & tailwinds,

 Bob Borger

 Europa XS Tri, Rotax 914, Airmaster C/S Prop.

 Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

 3705 Lynchburg Dr.

 Corinth, TX  76208-5331

 Cel: 817-992-1117

 rlborger(at)mac.com

 

 On Jun 27, 2013, at 4:59 PM, Alan Carter <alancarteresq(at)onetel.net> wrote:

 

 

 

 Hi All.

 The other day haven flown, I was sitting on the ground engine stopped, 

 I was fiddling with the GPS for about 25 mins, trying to learn how to store a route, I had left both fuel  pumps running, ??

 Heard the noise but it did not register, Crazy.

 Any damage or problem I may have caused , pumps running engine stopped on ground about 25-30 minutes.

 

 Alan

Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Thu Jun 27, 2013 2:31 pm Post subject: Re: 914 Electric Fuel pumps

Hi Bob.

Fuel selector was on, pumps working through out but it did notice a change in

tone towards the end,

The flight was good, the weather was good, the plane was good, and i was good in talking to Thames Radar, need the practice,

Just by coincidence radar asked me to turn East, to avoid traffic,

That evening i got an e-mail from the Capitan of the airliner, he had recognized my voice from years ago, and had me on his TECAS , and was watching me out of his window.

Small world. right place at right time.



Alan

Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Thu Jun 27, 2013 2:40 pm Post subject: Re: 914 Electric Fuel pumps

Hi all.

The pumps run continuously in flight, Fuel is going through, but on the ground no air flow around pumps,?

Fuel returning to tank, via carbs bowels ? i think?

Is there any chance of the fuel getting into the engine,? ie small jet nozzle .



Alan

rlborger(at)mac.com
Guest

Posted: Thu Jun 27, 2013 4:19 pm Post subject: 914 Electric Fuel pumps

Alan,



One of the pumps runs continuously in the air.  The other should be off.  No more air flow around them in the air than on the ground if they are under the baggage compartment as per build manual.  They are cooled by fuel flow through them.



There's no fuel coming out of the float bowls except through the main jet.  The float controls that and if it shuts the fuel off then no more fuel can get into the bowl.  Excess fuel returns to the tank via the fuel pressure regulator.



There should be no chance of fuel getting into the engine if all is plumbed correctly and the float is operating properly.  There is an overflow on the float bowl should excess fuel be introduced but, if all else is correct, that shouldn't happen.



Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com



On Jun 27, 2013, at 5:40 PM, Alan Carter <alancarteresq(at)onetel.net> wrote:






Hi all.

The pumps run continuously in flight, Fuel is going through, but on the ground no air flow around pumps,?

Fuel returning to tank, via carbs bowels ? i think?

Is there any chance of the fuel getting into the engine,? ie small jet nozzle .



Alan

rlborger(at)mac.com
Guest

Posted: Thu Jun 27, 2013 5:22 pm Post subject: 914 Electric Fuel pumps

Alan,



Brain fart.  The 914 float bowl is pressurized and therefore can not have an overflow.  The 912 has the float bowl overflow.



No fuel gets out of the float bowl on a 914 except through the main jet or starting carb (often referred to as "Choke").



So there should be no fuel getting into the engine with the fuel pumps on and engine not running.



Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com



On Jun 27, 2013, at 7:19 PM, Robert Borger <rlborger(at)mac.com> wrote:






Alan,



One of the pumps runs continuously in the air.  The other should be off.  No more air flow around them in the air than on the ground if they are under the baggage compartment as per build manual.  They are cooled by fuel flow through them.



There's no fuel coming out of the float bowls except through the main jet.  The float controls that and if it shuts the fuel off then no more fuel can get into the bowl.  Excess fuel returns to the tank via the fuel pressure regulator.



There should be no chance of fuel getting into the engine if all is plumbed correctly and the float is operating properly.  There is an overflow on the float bowl should excess fuel be introduced but, if all else is correct, that shouldn't happen.



Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop.

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com



On Jun 27, 2013, at 5:40 PM, Alan Carter <alancarteresq(at)onetel.net> wrote:






Hi all.

The pumps run continuously in flight, Fuel is going through, but on the ground no air flow around pumps,?

Fuel returning to tank, via carbs bowels ? i think?

Is there any chance of the fuel getting into the engine,? ie small jet nozzle .



Alan

Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Fri Jun 28, 2013 12:20 am Post subject: Re: 914 Electric Fuel pumps

Thanks Bob.

Float bowls and needle jets ets, its all coming back to me now, this old age is a sod of a thing. I,m glad flying is a bit like riding a bicycle or i would really be stuck.



Regards.

Alan



PS.  I just have one enemy up there, the weather, can have a nasty sting in its tail like a wasp, so i treat it like the police and traffic wardens, and avoid it whenever possible.



Regards 

Alan

BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Mon Jul 01, 2013 3:57 pm Post subject: 914 Electric Fuel pumps

Hi Alan:



Well, you just tested the battery and the fuel pumps.

Did you shut off the Master before you went home?

If so ALL IS WELL!

No damage done - No Blood, No foul.

 





Barry

On Thu, Jun 27, 2013 at 5:59 PM, Alan Carter <alancarteresq(at)onetel.net (alancarteresq(at)onetel.net)> wrote:

 [quote]--> RotaxEngines-List message posted by: "Alan Carter" <alancarteresq(at)onetel.net (alancarteresq(at)onetel.net)>

  

 Hi All.

 The other day haven flown, I was sitting on the ground engine stopped,

 I was fiddling with the GPS for about 25 mins, trying to learn how to store a route, I had left both fuel  pumps running, ??

 Heard the noise but it did not register, Crazy.

 Any damage or problem I may have caused , pumps running engine stopped on ground about 25-30 minutes.

 

 Alan

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=403538#403538

 

 

 

 

 

 

 

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Alan Carter

Joined: 02 Jul 2012
Posts: 378
Location: Kent, England.

Posted: Mon Jul 01, 2013 11:27 pm Post subject: Re: 914 Electric Fuel pumps

Barry.

Yes i did,

At the time the pumps where running i was sitting in the plane trying to figure out how two store a flight plan in the sky map 111c.

and this noise was going on in the background,and i took no notice of it.

then after about 20-30 minutes the penny dropped, and i realized it was the pumps running. I won,t be doing that again,

I am hoping to fly today, just a short local.



Regards

Alan

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