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Air in fuel lines

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dean.psiropoulos(at)veriz
Guest

Posted: Fri Nov 06, 2009 7:52 pm Post subject: Air in fuel lines

Hi all:



Been having a lot of trouble with a rough idle problem on my Fuel Injected

0-360 parallel valve engine.  I've been going through several tests trying

to locate the source of the problem but so far no joy.  One suggestion that

I have received concerns air getting into the fuel lines.  It seems a little

far fetched that air could get in through a fitting that is not leaking fuel

but I'm running out of ideas so I'll go through and tighten all my fittings

to see if that helps.



But, that leaves one other possibility and that's air getting in through the

fuel selector valve.  I'm using the Van's fuel selector that came with my

RV-6 kit. It sat in its little brown bag on the shelf in my shop for several

years before it got used but seems to working fine. It's not hard to move

the selector and its not leaking, at least externally. 



Anyone experience leaking of this valve or any issue with that might let air

into the fuel lines through it?  Any ideas on how I might test the valve to

see if it's leaking air into the system? 



I'm using the Van's high pressure pump setup that puts the pump ahead of the

selector valve so there will be some suction at the valve.  I'm running out

of ideas and thinking about switching to a carb.  Hate to do that but can't

find anything wrong after working on it for the last year, maddening.

Thanks.



Dean Psiropoulos

RV-6A N197DM

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pitts_pilot(at)bellsouth.
Guest

Posted: Fri Nov 06, 2009 8:05 pm Post subject: Air in fuel lines

I had a similar problem in my O-360 Pitts.  Found the problem 

accidentally ..... the rudder pedal was rubbing on the hard aluminum 

fuel line and finally rubbed a hole in it.  As long as the rudder pedal 

was over the hole .... the engine ran fine.  If the hole was uncovered, 

it really ran rough .... and wouldn't develop enough power to stay in 

the air.  Fuel (mogas) was leaking out while the airplane sat, but very 

slowly and evaporated ..... and I never smelled anything unusual.  I 

doubt that the valve is your culprit .... I've had them leak just a 

little but could smell it ..... but no other bad effects.

Linn

do not archive



DEAN PSIROPOULOS wrote:

 	  Quote: 	
		   

 

 Hi all:

 

 Been having a lot of trouble with a rough idle problem on my Fuel Injected

 0-360 parallel valve engine.  I've been going through several tests trying

 to locate the source of the problem but so far no joy.  One suggestion that

 I have received concerns air getting into the fuel lines.  It seems a little

 far fetched that air could get in through a fitting that is not leaking fuel

 but I'm running out of ideas so I'll go through and tighten all my fittings

 to see if that helps.

 

 But, that leaves one other possibility and that's air getting in through the

 fuel selector valve.  I'm using the Van's fuel selector that came with my

 RV-6 kit. It sat in its little brown bag on the shelf in my shop for several

 years before it got used but seems to working fine. It's not hard to move

 the selector and its not leaking, at least externally. 

 

 Anyone experience leaking of this valve or any issue with that might let air

 into the fuel lines through it?  Any ideas on how I might test the valve to

 see if it's leaking air into the system? 

 

 I'm using the Van's high pressure pump setup that puts the pump ahead of the

 selector valve so there will be some suction at the valve.  I'm running out

 of ideas and thinking about switching to a carb.  Hate to do that but can't

 find anything wrong after working on it for the last year, maddening.

 Thanks.

 

 Dean Psiropoulos

 RV-6A N197DM

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jfogarty(at)tds.net
Guest

Posted: Sat Nov 07, 2009 4:10 am Post subject: Air in fuel lines

Dean,  For the record I know nothing about engines, however, sometime in the 

last month I read about this type of problem online.  If you have a sniffle 

valve, check and make sure it is tight and working correctly.  The valve 

could be shot or loose.



Reduced pressure inside the manifold causes the ball to be sucked up to 

close the valve when the engine is running, but it drops down and lets the 

fuel drip out when the engine is shut down.



Jim

RV9a building

---

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