X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.115.11.52] (HELO fmailhost01.isp.att.net) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2936070 for flyrotary@lancaironline.net; Fri, 23 May 2008 18:41:08 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.52; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-210-52-159.mco.bellsouth.net[68.210.52.159]) by isp.att.net (frfwmhc02) with SMTP id <20080523224029H0200esdone>; Fri, 23 May 2008 22:40:30 +0000 X-Originating-IP: [68.210.52.159] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: Fuel Filtering Problem Date: Fri, 23 May 2008 18:40:33 -0400 Message-ID: <32DA8F6B095549E6986733854DAE5E00@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C8BD04.7C2FB7C0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Aci8+aDBm7SqUzQAR8GOb+a/eUK+HwAInY2Q X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18000 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C8BD04.7C2FB7C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I could use a little help on this problem. I apologize for the length. =20 My engine recently started to show signs of fuel starvation. Cutting out above about 3K rpm. It would just seem to go from 3K to idle. I was running on my primary fuel pump, so I turned on the secondary and the = engine would start to run normally. (Not like gangbusters, but NORMALLY. My = max static rpm has been about 52-5300 rpm and I have felt that it was not getting enough fuel to run up to my goal of 6K static) =20 I decided that I had a filter plugged, and fearing the gasohol that = they are now selling all over Florida, I opened up my Gascolator. It was ok. = I found a couple of wisps of white fibers. Could be fiberglass dust, = could be spider webs, something like that. I don=92t think that I have had any gasohol in the plane, but it is probably possible. But the Gascolator = was fine. =20 I then opened up the JEGS inline filter on the primary pump and the = element was covered with a black sludge. It seemed to be almost completely = blocked. This stuff looked like maybe it could have come from the inside of the = SS braided hose. =20 =20 I checked the secondary pumps filter and it was fine. I have not used = this secondary pump except on rare occasions to check for pressure changes, leaks, etc.. =20 But for that matter, I have only run three 5 gal cans of gas in the = plane totally. One 5 gal can in each wing, then another in the right side, = and I am now pulling out of the left tank which has the fourth 5 gal in it. =20 So, like I said, I at first thought that it was a rubber residue from = when I installed the hose ends on the Aeroquip hoses because it sort of looked = like that. Then as I drove home, I remembered that there was none of this = stuff in the Gascolator. (I think that some should have made it there as = there is one -8 hose in front of the Gascolator) There is only about a foot of = -8 hose in front of the fuel pumps after the Gascolator, so now I am = thinking that maybe it came from the fuel pump. =20 Is there anything inside the pump that could cause a black sludge if it started to crap out? What would I look for to check if the pump is out = or going out. Has anyone else had any similar problem? I recently heard a squealing sound from the area of the pumps, but at the time I thought = that it was bubbles going through the pump. I was close to empty on the = right tank and thought that it was sucking air. I switched tanks and the = sound went away. =20 I have not yet checked my injectors. Two reasons: I have no idea of = how to do it and would not know what to look for. Is the 40 micron screen = fine enough to keep anything from getting plugged up in the injectors? If = not, what do I look for, and where? =20 I would greatly appreciate some input as to your thoughts on this. How would you proceed? =20 My fuel system goes: Finger strainer in tank, =BD inch aluminum line to = Andair dual valve (switches both supply and return to same tank), Aeroquip -8 = SS braided line, boost pump, Aeroquip -8 SS braided line, Andair = Gascolator, Aeroquip -8 SS braided line about one foot to splitter to two fuel = pumps, (these are the pumps that Tracy sells), each pump is followed by a JEGS billet in line fuel filter with a stainless 40 micron element. Then a splitter to bring them back together to Aeroquip -6 SS braided line, = primary injector rail, Aeroquip -6 SS braided line, secondary injector rail, Aeroquip -6 SS braided line, Aeromotive fuel pressure regulator, = Aeroquip -4 SS braided line to the valve and back to the tank. The tanks are = fiberglass with ProSeal. This is a Lancair Legacy, Renesis engine. =20 Thanks for the help. =20 Bill B ------=_NextPart_000_0006_01C8BD04.7C2FB7C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 I could use a little help on this problem.=A0 I apologize = for the length.

 

My engine recently started to show signs of fuel starvation. = Cutting out above about 3K rpm.=A0 It would just seem to go from 3K to idle.=A0 = I was running on my primary fuel pump, so I turned on the secondary and the = engine would start to run normally.=A0 (Not like gangbusters, but NORMALLY.=A0 = My max static rpm has been about 52-5300 rpm and I have felt that it was not getting = enough fuel to run up to my goal of 6K static)

 

I decided that I had a filter plugged,=A0 and fearing the = gasohol that they are now selling all over Florida, I opened up my Gascolator.=A0 It was ok.=A0 I found a couple of wisps of = white fibers.=A0 Could be fiberglass dust, could be spider=A0 webs, something = like that.=A0 I don’t think that I have had any gasohol in the plane, but it is probably possible.=A0 But the Gascolator was = fine.

 

I then opened up the JEGS inline filter on the primary pump and = the element was covered with a black sludge.=A0 It seemed to be almost = completely blocked.=A0 This stuff looked like maybe it could have come from the inside of the = SS braided hose.=A0

 

I checked the secondary pumps filter and it was fine.=A0 I have = not used this secondary pump except on rare occasions to check for pressure = changes, leaks, etc..

 

But for that matter, I have only run three 5 gal cans of gas in = the plane totally.=A0 One 5 gal can in each wing, then another in the right = side, and I am now pulling out of the left tank which has the fourth 5 gal in = it.

 

So, like I said, I at first thought that it was a rubber residue = from when I installed the hose ends on the Aeroquip hoses because it sort of = looked like that.=A0 Then as I drove home, I remembered that there was none of = this stuff in the Gascolator.=A0 (I think that some should have made it there = as there is one -8 hose in front of the Gascolator)=A0 There is only about a foot = of -8 hose in front of the fuel pumps after the Gascolator, so now I am = thinking that maybe it came from the fuel pump.

 

Is there anything inside the pump that could cause a black = sludge if it started to crap out?=A0 What would I look for to check if the pump is = out or going out.=A0 Has anyone else had any similar problem?=A0 I recently = heard a squealing sound from the area of the pumps, but at the time I thought = that it was bubbles going through the pump.=A0 I was close to empty on the right = tank and thought that it was sucking air.=A0 I switched tanks and the sound went = away.

 

I have not yet checked my injectors.=A0 Two=A0 reasons: =A0I = have no idea of how to do it and would not know what to look for.=A0 Is the 40 micron = screen fine enough to keep anything from getting plugged up in the injectors? =A0If = not, what do I look for, and where?

 

I would greatly appreciate some input as to your thoughts on = this.=A0 How would you proceed?

 

My fuel system goes: Finger strainer in tank, =BD inch aluminum = line to Andair dual valve (switches both supply and return to same tank), = Aeroquip -8 SS braided line, boost pump, Aeroquip -8 SS braided line, Andair = Gascolator, =A0Aeroquip -8 SS braided line about one foot to splitter to two fuel pumps, (these = are the pumps that Tracy sells), each pump is followed by a JEGS billet in line = fuel filter with a stainless 40 micron element.=A0 Then a splitter to bring = them back together to Aeroquip -6 SS braided line, primary injector rail, Aeroquip = -6 SS braided line, secondary injector rail, Aeroquip -6 SS braided line, = Aeromotive fuel pressure regulator, Aeroquip -4 SS braided line to the valve and = back to the tank.=A0 The tanks are fiberglass =A0with ProSeal.=A0 This is a = Lancair Legacy, Renesis engine.

 

Thanks for the help.

 

Bill B

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