REFLECTOR:Fuel filters
Brian Michalk
reflector@tvbf.org
Tue, 17 Feb 2004 13:08:22 -0600
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A carbureted system with a bowl is not very critical. I was thinking more
along injected type stuff.
Brian Michalk <http://www.michalk.com>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and barely single
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On Behalf
Of John Dibble
Sent: Tuesday, February 17, 2004 12:45 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Fuel filters
That's a nice setup. When I bought my Velocity it had 205 hours and no
filter, so I doubt that a little unfiltered fuel is going to be a big
problem. I did have an occasional slow fuel leak at the carbureator (I
could "fix" it by shutting off the fuel and running the engine until the
bowl was empty - on the ground of course.) My guess is that the float valve
was dirty and not sealing well. I just replaced the float valve and seat so
soon I will know it that was the problem. The bowl and valve were very
clean with no sediment.
John
Brian Michalk wrote:
I'm sure something like that exists, but would you want unfiltered fuel
plugging up your system?
There are commercial filters that have a sensor that tells you when the
filter is plugged, but you could roll one yourself by putting a pressure
sensor on each side of the filter. As the filter becomes clogged, the
pressure across the filter increases, showing up as a delta voltage on your
sensors.
I've gone perhaps a little overboard instrumenting my airplane ... I do
instrumentation for a living. I've got sensors at each fuel pump output ...
I'll draw a picture. It's easier.
EFP-->PS1-->CV-->FILT
\
TEE-->PS3-->flow1-->FPR-->flow2-->PS4-->engine
/
MFP-->PS2-->CV-->FILT
EFP-electric driven fuel pump
MFP-mechanical driven fuel pump
PS1-pressure from electric fuel pump
PS2-pressure from mechanical fuel pump
FILT-fuel filters
CV-check valve
PS3-pressure at input of fuel pressure regulator
flow1-total fuel flow from pumps
FPR-fuel pressure regulator, dumps excess back to sump
flow2-fuel flow going to engine
PS4-fuel pressure at engine injectors
So a delta pressure between PS1:PS3 and PS2:PS3 will indicate a blocked
fuel filter.
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of John Dibble
Sent: Tuesday, February 17, 2004 9:58 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Fuel filters
I have a cheap in-line filter and also worry about fuel restriction.
I checked it after 10 hours and it seemed to flow as well as a new filter.
So I feel comfortable it will last 100 hours anyway. I guess the one good
thing about fuel restriction is that it should happen at the beginning of
the takeoff roll where there is room to abort. Do they make filters that
allow the flow to bypass if the filter becomes plugged? Or a separate
"pressure relief" valve that can be installed in parallel with the filter?
John
Gilles Gratton wrote:
Is anyone out there using the K & N Billet Aluminum Fuel filter? If
so, do you recommend it? I plan to use it on my Franklin engine to replace
that small miniature glass filter which I have been using so far ,
successfully but with constant fear and apprehension that it will restrict
fuel flow and starve my engine in a moment of high fuel demand.
Gilles Gratton
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<DIV><SPAN class=3D531390719-17022004><FONT face=3DArial color=3D#0000ff =
size=3D2>A=20
carbureted system with a bowl is not very critical. I was thinking =
more=20
along injected type stuff.</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT size=3D2> Brian Michalk <<A =
href=3D"http://www.michalk.com/"=20
target=3D_blank>http://www.michalk.com</A>><BR>Life is what you make =
of it ...=20
never wish you had done something.<BR>Aviator, experimental aircraft =
builder,=20
motorcyclist, SCUBA diver<BR>musician, home-brewer, entrepreneur and =
barely=20
single<BR> </FONT> </P>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> =
reflector-admin@tvbf.org=20
[mailto:reflector-admin@tvbf.org]<B>On Behalf Of </B>John=20
Dibble<BR><B>Sent:</B> Tuesday, February 17, 2004 12:45 =
PM<BR><B>To:</B>=20
reflector@tvbf.org<BR><B>Subject:</B> Re: REFLECTOR:Fuel=20
filters<BR><BR></FONT></DIV>That's a nice setup. When I bought =
my=20
Velocity it had 205 hours and no filter, so I doubt that a little =
unfiltered=20
fuel is going to be a big problem. I did have an occasional slow =
fuel=20
leak at the carbureator (I could "fix" it by shutting off the fuel and =
running=20
the engine until the bowl was empty - on the ground of course.) =
My guess=20
is that the float valve was dirty and not sealing well. I just =
replaced=20
the float valve and seat so soon I will know it that was the =
problem. =20
The bowl and valve were very clean with no =
sediment.<BR><BR>John<BR><BR>Brian=20
Michalk wrote:<BR>
<BLOCKQUOTE cite=3DmidNGBBLKIBLMDNILPAICAJIEDJFIAA.michalk@awpi.com=20
type=3D"cite"><META content=3D"MSHTML 5.00.2614.3500" =
name=3DGENERATOR>
<DIV><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
class=3D440115815-17022004>I'm sure something like that exists, but =
would you=20
want unfiltered fuel plugging up your system?</SPAN></FONT></DIV>
<DIV><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
class=3D440115815-17022004>There are commercial filters that have a =
sensor=20
that tells you when the filter is plugged, but you could roll one =
yourself=20
by putting a pressure sensor on each side of the filter. As =
the filter=20
becomes clogged, the pressure across the filter increases, showing =
up as a=20
delta voltage on your sensors.</SPAN></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
class=3D440115815-17022004>I've gone perhaps a little overboard =
instrumenting=20
my airplane ... I do instrumentation for a living. I've got =
sensors at=20
each fuel pump output ... I'll draw a picture. It's=20
easier.</SPAN></FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><STRONG><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
=
class=3D440115815-17022004>EFP-->PS1-->CV-->FILT</SPAN></FONT></=
STRONG></DIV>
<DIV><STRONG><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
=
class=3D440115815-17022004> &nbs=
p;  =
;=20
\</SPAN></FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
=
class=3D440115815-17022004> &nbs=
p;  =
; =20
=
TEE-->PS3-->flow1-->FPR-->flow2-->PS4-->engine</SPAN></=
FONT></STRONG></DIV>
<DIV><STRONG><FONT face=3DFixedsys color=3D#0000ff size=3D2><SPAN=20
=
class=3D440115815-17022004> &nbs=
p;  =
;=20
/</SPAN></FONT></STRONG></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT=20
face=3DFixedsys><STRONG>MFP-->PS<SPAN=20
class=3D440115815-17022004>2</SPAN>-->CV<SPAN=20
=
class=3D440115815-17022004>-->FILT</SPAN></STRONG></FONT></FONT></FONT=
></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT=20
face=3DFixedsys><STRONG></STRONG></FONT></FONT></FONT> </DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>EFP-electric driven fuel=20
pump</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>MFP-mechanical driven fuel=20
pump</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>PS1-pressure from electric fuel=20
pump</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>PS2-pressure from mechanical fuel=20
pump</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>FILT-fuel=20
filters</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>CV-check=20
valve</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>PS3-pressure at input of fuel pressure=20
regulator</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>flow1-total fuel flow from=20
pumps</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>FPR-fuel pressure regulator, dumps excess =
back to=20
sump</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>flow2-fuel flow going to=20
engine</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>PS4-fuel pressure at engine=20
injectors</SPAN></STRONG></FONT></FONT></FONT></DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT=20
face=3DFixedsys><STRONG></STRONG></FONT></FONT></FONT> </DIV>
<DIV><FONT size=3D2><FONT color=3D#0000ff><FONT =
face=3DFixedsys><STRONG><SPAN=20
class=3D440115815-17022004>So a delta pressure between PS1:PS3 and =
PS2:PS3=20
will indicate a blocked fuel=20
filter.</SPAN></STRONG></FONT></FONT></FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: =
rgb(0,0,255) 2px solid; MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B> <A=20
class=3Dmoz-txt-link-abbreviated=20
=
href=3D"mailto:reflector-admin@tvbf.org">reflector-admin@tvbf.org</A> =
[<A=20
class=3Dmoz-txt-link-freetext=20
=
href=3D"mailto:reflector-admin@tvbf.org">mailto:reflector-admin@tvbf.org<=
/A>]<B>On=20
Behalf Of </B>John Dibble<BR><B>Sent:</B> Tuesday, February 17, =
2004 9:58=20
AM<BR><B>To:</B> <A class=3Dmoz-txt-link-abbreviated=20
=
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A><BR><B>Subject:<=
/B>=20
Re: REFLECTOR:Fuel filters<BR><BR></FONT></DIV>I have a cheap =
in-line=20
filter and also worry about fuel restriction. I checked it =
after 10=20
hours and it seemed to flow as well as a new filter. So I =
feel=20
comfortable it will last 100 hours anyway. I guess the one =
good=20
thing about fuel restriction is that it should happen at the =
beginning of=20
the takeoff roll where there is room to abort. Do they make =
filters=20
that allow the flow to bypass if the filter becomes plugged? =
Or a=20
separate "pressure relief" valve that can be installed in parallel =
with=20
the filter?<BR><BR>John<BR><BR>Gilles Gratton wrote:<BR>
<BLOCKQUOTE =
cite=3DmidDAEDKOMCBHINGJEIJCOJIEHGCJAA.gratton@magma.ca=20
type=3D"cite">
<META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR>
<DIV><FONT face=3DArial size=3D2><SPAN =
class=3D810285815-15022004>Is anyone=20
out there using the K & N Billet Aluminum Fuel filter? If =
so, do you=20
recommend it? I plan to use it on my Franklin engine to =
replace=20
that small miniature glass filter which I have been using so far =
,=20
successfully but with constant fear and apprehension that it =
will=20
restrict fuel flow and starve my engine in a moment of high fuel =
demand.=20
</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN =
class=3D810285815-15022004>Gilles=20
=
Gratton</SPAN></FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCK=
QUOTE></BODY></HTML>
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