REFLECTOR: Fuel Filters

Tue Apr 7 08:39:05 CDT 2009

That sounds like are REALLY good fuel filter to me.  Do you have the
manufacture and part number?  Does it have a particle size filtered spec?

Jerry Brainard
Jerry at JLBEnt.com

  	-------Original Message-------
From: Gary Stull
Subject: Re: REFLECTOR: Fuel Filters
Sent: Apr 07 '09 8:17am

I use a Marine fuel filter with a water seperator. It has a spin on
replaceable cartridge with a transparent bowl on the bottom with a quick
drain to remove water. ----- Original Message -----
FROM: [LINK: mailto:KMis178813 at aol.com] KMis178813 at aol.com
TO: [LINK: mailto:reflector at tvbf.org] reflector at tvbf.org
SENT: Monday, April 06, 2009 10:43 PM
SUBJECT: Re: REFLECTOR: Fuel Filters

Collective
    For the new builders (or the old builders with new engine install) be
careful not to save money on fuel filters!! Automotive filters are
typically paper elements and when introduced to fuel with water trace's
clog with a gel substance. Aircraft filters are usually metal screens and
will pass water but not debris. At least this gives you a fighting chance
if you have some water.
    The Factory vent line that Brian referred to went up the firewall to
the roof and then a foot forward before returning to the firewall and then
out the belly. The reason for this was from another factory plane with full
tanks and a much increased angle of attack (with high output engine) the
front of the strakes were higher than the vent line. Normally the fuel
would have just come out the vent but in the configuration that it was
installed the fuel came out the vent directly into the induction air stream
and went to way rich on the mixture. After the engine lost power the angle
of attack lessoned the mixture went correct and then repeated. Moving the
vent forward on the roof increases the vent height when the nose is high.
FWIW
     Ken

In a message dated 4/6/2009 1:12:45 P.M. Eastern Daylight Time,
nmflyer1 at aol.com writes:  I have several fuel filters. I have one of those
glass jobs on each line that goes from the tank into the sump. Once I run
enough fuel through this thing, those will come out. I also have another
filter just before the pumps. This one is cleanable and will stay in.

Kurt

-----Original Message-----
From: aminetech at bluefrog.com
To: Velocity Aircraft Owners and Builders list
Sent: Mon, 6 Apr 2009 11:04 am
Subject: Re: REFLECTOR: Engine failure causes

--- [LINK: mailto:michalk at awpi.com] michalk at awpi.com wrote:

From: Brian Michalk <[LINK: mailto:michalk at awpi.com] michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <[LINK:
mailto:reflector at tvbf.org] reflector at tvbf.org>
Subject: REFLECTOR: Engine failure causes
Date: Mon, 06 Apr 2009 11:10:59 -0500

I've been going through the possible theories as to why my engine failure
occurred.  I didn't want to post rampant speculation, but a week has
passed, and I need to bounce some ideas off the collective.

More unlikely theory #4: Water in fuel
Even though I did not check the sump before first flight, the tanks with
caps on are very tight, and the plane kept in a hangar.  Again, the high
angle from takeoff might have injested the water.  There should be evidence
of water in the main tanks if this theory is correct.  The dry fuel return
hose begins to rule this scenario out as a candidate.

I believe I had water in my fuel once.  I recieved fuel at a class C
airport after I had done my preflight and did not sample the gas after
fueling.  At about 300 ft agl the engine cut out and regained power about 3
times in rapid succession.  It's basically the same way a car runs with
water in the fuel.  I then reduced climb to 500 ft/min and the engine ran
fine.  The control tower must have noticed as they instructed me to
maintain a good rate of climb.  At 3000 ft I increased the climb to 1000
ft/min and experienced a few mild hesitations, so I went back to 500 ft/min
and proceeded with caution without further incident during my 3 hour
flight.  After landing I checked the carburator bowl and found no water.
However avgas in the South is aromatic based and can dissolve 500 ppm of
water, so I wasn't too surprised not to find any.

More unlikely theory #5: excessive vacuum on vent line
It might be possible that the vent line exiting the plane is in a high
vacuum area.  I'll try to simulate with a leaf blower.

Not sure this matters.  I have my fuel filter before both fuel pumps and
neither pump has any problem sucking the fuel through the filter.

John

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