cr tdi fuel filter housings
TRANSCRIPT
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Fuel
Filter
housing
construction
and
flow
paths,
CJAA,
CBEA,
Early
BRM.
Thisistheonewiththewaterremovalscrewontop.
Ihavealwayswonderedhowthefuelflowedthroughthishousing,andrecently
hadachancetofindout.
1.
Ihavelabeledthepassagesinthistextwithnumbersandusedcolored
cabletiestohelpmakethepassagesclear.
2. Thisparticularhousingcameoffofa2010CJAAJetta.
3.
Aswith
many
apparently
simple
automotive
components
there
are
quite
a
fewimportantdesignfeaturesincorporated.Iwillpointsomeout,but
therearelikelysomethatImissedaswell.
4. Notethetampersealwaxontheventscrewandoneofthefiltertop
screws.
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Flowpathsandimportantfeatures.
1) (RED)Fuelentersfromtheliftpumpandisdumpedoutsidethefilter.Fuel
isfreetoflowaroundtheouteredges,andthetopandbottomofthefilter
housing.
2)
(Yellow)Thisisthefuelreturnlinetothetank.
3) (Green)Thisscrewsealsthetopofatubethatrunstotheverybottomof
thefilterhousing. Itisonlyopenatthisscrewandontheverybottom.
4) (Yellow)Thisisthereturnflowfromtheengine(fromfuelrailandHPFP
excessontheCJAAandCBEA,fromthereturnfuelrailbuiltintothehead
ontheBRM.)Thisiswherewearparticlestravel.
5)
(White)Thisiscleanfueltotheengine(viatheboosterpumpandHPFPon
theCJAA
and
CBEA,
and
to
the
tandem
pump
on
the
BRM.)
6) (Yellow)Thisgapinthetopislabeledbecausethereisanopenpassagein
thecenterfueldistributionassemblyunderthislid.
7)
(Notnumbered)Twodetentsforaligningtheheadandcenterfuel
assemblytoeachother,locatednearthecenterofthelid.
8) (Notnumbered)Adetentontheedgetoalignthelidtothebodyofthe
filterhousing.
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Showingflowdirectionandusingcolorstoshowjoiningflowpaths.Path1inthe
lowerrightiswherethefuelentersandshouldbeshownasred. (Inactualityit
hasared
and
yellow
tie
in
it;
Iwish
the
red
was
on
topThe
yellow
recirc
flow
pathjoinsthereddirtyfuelflowpaththroughthechannelmarked6here.
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Thisshowsthebottomhalfofthecentralpostassemblythatinsertsintothe
toppiece. Notethetubeandoringforthewaterremovalpassage. Notethe
sideviewofthefalsefloor,whichcreatesthebottomtraporplenum.
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Thisisthebottomofthecenterpostassembly.Thehighpipewiththeoringseals
totheupperhalfofthehousing,providingasealedtubeallthewaythroughthe
centerhousingtotheunfilteredfuelareabelowthefilter. Notetheslotsaround
thebottomflangeforthetopsclipstomateinto.
Notethefalsefloorthathasanareacutouttoallowwaterandsedimenttofall
intotheclosedplenumbelowthefalsefloor. Theonlywayto getthewaterout
ofthisareaistoturntheassemblyupsidedownafterremovingthefilter.
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Thisshowsthetopandbottomofthecenterpostsetontopofeachother,but
notclipped. Notethegreentieofthewaterremovalportstickingoutthe
bottom.
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Thisshowsthebottomoftheassembliessetoneachother.Thebottomclips
mateintoslotsonthebottomofthecanister. Theouterspringismissinginthis
photo.
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Thisphotoshowsthetopandbottomalmostcompletelymated(notetheoringis
stillslightlyvisiblethetopneedstoslidedownanothereighthofaninch. Both
springsarevisibleinthisphoto.
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AviewwiththeOlympicringsinplace. Notethathereyoucanseethattherecirc
flowpath(yellow)joinstheredintherectangularnotchshownonthelowerarcof
thetop. Recircflowisfreetomixwiththeunfilteredfuelaroundthetop,outside,
andbottomofthefilter. Thisiswherethemetalparticlesenterthetopareaof
theassemblyinthosedramaticphotosofHighPressureFuelPumpdamage.
The
recirc
flow
through
the
ports
marked
in
yellow
are
what
VW
calls
the
fuel
heater.
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AphotoofacutupOEMfuelhousing. Notetheflangetackweldedonthe
bottomthatthecenterassemblyclipsinto. Alsonotethepassagesthatallowfree
flowoffuelandwaterintothecentralarea.