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# OAR Box 

# 1818 Prepped by Ollie Stewart



## Document

Number: 

# 28 ) ll-D- 1
Docket Number: 

# A-87-1 1

Printed 11/6/2008 3:12:44

PM Sheet 28 of 79

# A-mi Jf-0-o\


# #'Olo 23

Environmenta l an d Safet y Th e America n Roa d Engineerin g Staff Dearborn , Michiga n 4812 1 For d Moto r Compan y 

### Jun e 17 , 198 6

Mr . R . Fre dHolber t U.S . Environmenta l Protectio nAgenc y 256 5 Plymout hRoa d An nArbor , M I 4810 5
Dea r Mr . Holbert :

A s I indicate di nou r telephon e conversatio no f Ma y 23 , 1986 , For dha s begu nmeetin g wit hvariou s supplier s i na nattemp t t o pul l togethe r mor e detaile dspecification s fo r wha t i t woul dtak e t o d o th e onboar dcontro l o f refuelin g vapor s properly . Base do nou r initia l contact s wit hfue l pum pnozzl e manufacturers , we ar e becomin g more concerne db

y th e multitud e o f fue l fille r nozzle s tha t ar e bein g use d commerciall y

an dtha t withou t uniform standard s trechanica l fillpip e seal s ma y no t b e feasible . These nozzle s configuration s hav e a neffec t o nthe amoun t o f vapor s generated , th e efficienc y o f th e sea l mechanis m an dthe fue l flow

an dshutof f characteristics . I norde r t o hel pinsur e tha t the fiel defficienc y

o f a nonboar dcontro l system wil l approac hthe theoretica l desig nefficiencie s calculate db y EP A an dothers , i t appear s now tha t some typ e o f desig nstandard s wil l b e require dfo r nozzl e configuration s an dtha t servic e station s woul di nal l likelihoo db e require dt o instal l ne w nozzl e spout s tha t conform t o thes e uniform standards .

Thes e desig nstandard s shoul dInclud e a t a minimu m a limi t o n fue l flow

rat e a t th e pum

p(a s wa s discusse dbriefl y a t th e Apri l 10 , 198 6 meetin g i nAn nArbor) , a s wel l a s specification s o nlength , diameter , positio nan

d angl e o f bends , positio no f latchin g mechanism s an dcontrol s o nburr s an

dprotrusion s tha t coul dpotentiall y damag e the sea l mechanism . The latte r contro l i s necessar y because i t appear s no w tha t the les s efficien t liqui dseal s ma y no t b e feasibl e fo r al l vehicl e configurations . Enclose dar e scal e drawing s illustratin g th e nozzl e en dpoin t an dshutof f por t position s fo r variou s nozzle s place di nthe full y inserte dan

dlatche dpositio nI na typica l For dfille r pipe . Th e degre e o f variabilit y

i s obviou s anddoe s contribute t o difficult y i nproducin g a fil l pip e desig nwhic hwil l flow fue l a t a wide rang e o f flow rate s an

d shutof f automaticall y wit hn o spitback . Fo r example , i t i s no t unusua l fo r fille r pipe s t o b e capabl e o f ove r 1 2 gallon s pe r minut e wit hon e manufacturer' s nozzl e bu t jus t barel y capable o f meetin g the CAR B requirement s a t 8 gallon s pe r minute wit hanothe r design . Ther e i s n oP. 3

- 2 -
poin t t o optimizin g the fillin g characteristic s b y modifyin g fille r pip e design s to sui t the "wors t case " nozzl e sinc e thi s woul dinevitabl y lead t o makin g anothe r nozzl e the wors t case . The onl y rationa l approac hi s t o tightl y specif y

the nozzl e configuration . I t i s hope dtha t thi s insigh t int o som e o f the technica l concern s surroundin g ou r developmen t effort s wil l resul t i nbette r regulations . W e woul denvisio ntha t EP A woul dals o specif y a particula r nozzl e fo r the certificatio ntes t t o insur e consistenc y i nmeasurin g compliance .

O na separat e bu t somewha t relate dissue , w e welcom e you r solicitatio nfo r detail s concernin g benc hagin g technique s fo r stabilizin g canister s fo r the tes t sequence . A s indicate ddurin g ou r meeting , w e believ e tha t the repeatabilit y o f the tes t ca nb e greatl y improve db

y adoptin g thes e type s o f procedures . Ou r tes t laborator y i s currentl y developin g dat a t o resolv e some o f the issue s brough t u pa t ou r meetin g Jun e 10 , an

dw e loo k forwar dt o workin g wit hyo ut o generate a mor e repeatabl e an

dstreamline dtes t procedure . W e wil l continu e t o kee pyo uapprise do f ou r finding s an d concern s an

dwoul dappreciat e i t ver y muc hi f yo ud o th e same . W e ar e particularl y

intereste di nho w EP A propose s t o solv e th e safet y concern s raise db

y NHTSA .

WMK.1 0P. 4



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