Hi Buly,
A narrow bank air/fuel meter only tells you if the engine is lean or rich over a very narrow range.  It would be nice to know just how lean (or rich).  Never fear, it only takes money to find out!!!  I'm buying a PLX wide-band meter to help tune my 5.0 Mustang after I get that engine back together.  I'll also use it in my airplane when I get back to that project.  See this website:
http://www.plxdevices.com/products_widebandO2.htm

Ken Powell
Bryant, Arkansas
501-847-4721
C150 / RV-4 under construction

-------------- Original message --------------
From: Bulent Aliev <atlasyts@bellsouth.net>

>
>
> On Dec 28, 2006, at 9:51 PM, John Slade wrote:
>
> > >I noticed my mixture bar was going from lean to totally
> > desapearing. Turning the knob to full rich was not enough.
> > I saw this a few times.
> > Check your fuel filter, Buly
> > John
> >
>
> I replaced it less than 2 hours ago and it is a large canister. I
> may blow the lines with some compressed air.
> Buly
>
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