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Air in fuel lines?

 
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jakent(at)unison.ie
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PostPosted: Sat Nov 07, 2009 4:28 am    Post subject: Air in fuel lines? Reply with quote

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

Hi Dean,
Have you checked the air induction system thoroughly for air leaking in at
low power settings. A slight tightening of all the hose clips improved
things for me. Also you could re-check the idle mixture setting when you
are sure the induction leak is not happening?
John Kent (EI-DIY RV-4)

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ceengland(at)bellsouth.ne
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PostPosted: Sat Nov 07, 2009 6:10 pm    Post subject: Air in fuel lines? Reply with quote

jakent(at)unison.ie wrote:
Quote:

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

Hi Dean,
Have you checked the air induction system thoroughly for air leaking in at
low power settings. A slight tightening of all the hose clips improved
things for me. Also you could re-check the idle mixture setting when you
are sure the induction leak is not happening?
John Kent (EI-DIY RV-4)
I'd 2nd that thought. I've had the pressed-in intake stubs in the sump

get loose, causing bad idle (carb engine, but would cause the same thing
with injection).

Here's another, somewhat remote possibility. One of my neighbors flies a
Cont IO360 Swift. It has a lot of AN hose between the tanks & the fuel
pump. It developed the problem of quitting when he would bank at certain
angles. 2 or 3 deadstick landings while trying various things to find
the problem. He tried a lot of different things & ultimately discovered
that if he air-pressurized the suction side AN hose, it would 'blow
bubbles' all over the fabric coating if it was wet down with water. (No
noticeable gas leaks) He replaced the hoses, & hasn't had it quit since.
The best guess is that it was sucking air through the hose sidewalls.
(Hose was quite a few years old.)

Charlie


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