fuel filter puzzle/Webra 145

[Brian Billings]

    I purchased and started running one of these two weeks ago, first
weekend out with the motor went without a hitch, set rich but plenty of
power and good transition { 28 clicks on the high and about 3/4 turn on the
low}, fuel filter is in the line to the pump, ran motor dry and added oil
when done. The next weekend was not so good, the motor was difficult to
prime {about thirty flips by hand to get fuel up to pump} but once primed it
started ok and seemed to be running ok. put it in the air and emeadiatly
noticed a sag in the engine on part throttle up lines, landed the plane and
backed out the high speed needle a couple of clicks and at part throttle on
the ground the motor was surging up and down, attempts to adjust the motor
did not fix the problem. While running the motor on the ground I noticed
large air bubbles in the line from the pump to the carb, the line from the
tank to the pump stayed solid with fuel. Due to the fact that the supply
line was air free and the line to the carb has large air bubbles I concluded
that the pump must be leaking air. When I got home I did a good check of all
lines and fittings at the pump also found one head bolt half way backed out
and it did not feel like it wanted to go back in. Rather then trying to fix
i decided it best to send motor to peidmont for repair. I will post what the
out come ends up being.
----- Original Message -----
From: "Brian Young" <b4598070 at yahoo.com>
To: <discussion at nsrca.org>
Sent: Wednesday, March 26, 2003 9:24 AM
Subject: Re: fuel filter puzzle


> Earl, Ive had the same problem. Usually a hesitation
> coming out of a long idle, especially on inverted
> stuff, you think it has died and then it pops and
> goes. Sometimes blows a cool smoke ring.
>
> What Matt said is correct, needle setting. You really
> want the filter before the pump cause stuff in the
> pump is bad. Maybe by moving the filter ahead of the
> pump you dropped your pressure slightly more than
> having the filter between pump and carb, thus leaning
> the engine a bit more.
>
> --- Rcmaster199 at aol.com wrote:
> > In a message dated 3/25/2003 10:19:39 PM Eastern
> > Standard Time,
> > jivey61 at msn.com writes:
> >
> >
> > > Subj:Re: fuel filter puzzle
> > > Date:3/25/2003 10:19:39 PM Eastern Standard Time
> > > From:<A
> > HREF="mailto:jivey61 at msn.com">jivey61 at msn.com</A>
> > > Reply-to:<A
> >
> HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> > > To:<A
> >
> HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> > > Sent from the Internet
> > >
> > >
> > >
> > >  Earl
> > >  I just last weekend started using my Webra 145,
> > and noticed a hesitation
> > > when I throttle up. My filter is also before the
> > pump. This may be the
> > > problem. I was thinking it may be a little rich on
> > low end. I have 2
> > > gallons fuel run through it now.15%.
> > >
> > > Jim Ivey
> > >
> >
> > Jim,
> >
> > If you are running the pipe at the recommended
> > length, then what you are
> > describing is a lean idle needle. You may want to
> > richen it a lttle at a time
> > until the problem is eliminated.
> >
> > Also if you decide to run higher nitro than what you
> > are using now, you
> > wantto richen the idle needle.
> >
> > To prove it to yourself, I suggest that you run a
> > tankful that is about 5%
> > less nitro than what you are using now, and see.
> >
> > Matt Kebabjian
> >
>
>
> =====
> Brian Young
> Tulsa
> b4598070 at yahoo.com
> 918-745-6046h
> 918-838-0900w
>
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