# OAR Box 

# 1850 Prepped byOllie Stewart



### Document

Number: 

# 74 ) IV-B- 4 Docket Number: 

# A-90-0 7 p. i

Printed 11/18/200811:09:28AM Sheet 74of 161P.2 

## V*S J UNITE D STATE S ENVIRONMENTA LPROTECTIO N AGENC Y AN N ARBOR

. MICHIGA N 4810 5 

## MA Y

## 2 5 1994

MEMORANDU M SUBJECT : Summar yo f Fue l Tan k Temperatur e Dat a OFFIC E O F Ai n AN O ITADIATIQ N 

# ai s JJJLA 1 MA Y2 6 B W 

# U EPAAI R DOCKE T FROM : THRU : TO : Rober t Johnson , Environmenta l Protectio nSpecialis t / 7/ , . ,

Specia l Regulator yProject s Branc h. ~ (j Judit hGray , Senio r Projec t ManagerCJ^&_^V_^Ot ~ _£ , Specia l Regulator yProject s Branc h/ / ) Ai r Docke t A-90-0 7 I norde r t o determin e a representativ e temperatur e rang e fo r generatin g evaporativ e emission s fo r emission s speciatio nan d biologica l testin g o f fuel s an dfue l additive s (F/FA ) •, EP A consulte d dat a whic hha d bee ngathere dfo r th e recen t evaporativ e emission s rulemakin g (5 8 F R16002 , Marc h24 , 1993) . Thes e dat a show , amon g othe r parameters , increase s i nfue l tan k temperature s tha t ma yb e expecte d t o occu r durin g in-us e vehicl e operation . I n norma l vehicl e operation , th e temperatur e o f th e fue l i nth e vehicl e fue l tan k increases , becaus e o f hea t generate dinternall y i npumpin g th e fue l fro mth e tan k t o th e engin e an dbac k agai n( a portio no f thi s fue l i s no t use d byth e engin e an di s returne dt o th e fue l tan k vi a a retur nline) , an dbecaus e o f hea t fro msource s externa l t o th e fue l system , e.g. , engin e hea t o r proximit yo f fue l line s t o th e exhaus t system . T o obtai nthes e data , a nEP Acontracto r conducte da serie s o f 13 9 fue l tan k temperatur e test s o nin-us e light-dut yvehicle s (LDV ) an d 3 0 test s o nin-us e light-dut ytruck s (LDT) . Th e purpos e o f thi s testin g wa s t o develo p LDV/LD T vehicl e fue l tan k temperatur e profile s resultin g fro m norma l vehicl e operation . Thre e separat e tes t sequence s wer e conducte dfro mSeptember , 198 9 t o September , 1991 , a t tw o tes t track s locate da t warm-weathe r sites . Vehicle s wer e selecte d t o represen t hig hsale s volum e vehicle/engin e combination s fro m mode l year s 198 3 t o 1992 . Th e hot-soak/runnin g loss-relate d portion s o f th e tes t sequence s consiste do f measurin g vehicl e fue l tan k temperature s a t selecte dinterval s whil e th e vehicle s wer e operate d ove r a serie s o f EP Aurba ndrivin g cycles . Th e result s o f thes e tes t sequence s ar e summarize di nTabl e 1 , an d th e portion s o f th e dat a generate d durin g th e firs t an dsecon dtes t sequence s ar e attached . Dat a gathere ddurin g thir dtes t sequenc e ma yb e foun d i nEP APubli c Docke t A-89-1 8 (Itemnumbe r IV-D-4) . Al l o f th e temperatur e gai ndat a i nTabl e 1 belo war e weighte d average s o f th e tabulate ddata .P. 3



### Tabl e 1 Tes t Sequenc e Septembe r 198 9 Augus t 199 0 Augus t 199 1 Total/Averag e Number o f Test s 5 9 4 3 9 4 19 6 Av

gTemp . Gai n 27° F 32° F 31° F 30° F I narriving a t a representativ e temperatur e t o b e maintaine d b yth e evaporativ e emission s generato r use d b yF/F Aproducer s fo r generating evaporativ e emission s fo r F/F Atesting purposes , EPA judge d i t appropriat e t o add th e averag e in-us e temperatur e gai n o f 30° F fromTabl e 1 t o aninitia l temperatur e o f 100°F . Thi s initia l temperatur e i s roughl ycomparabl e t o th e uppe r end o f th e initia l fue l temperatur e rang e specifie d i nth e evaporativ e rul e fo r running loss/ho t soak testing (i.e. , 98°F) , rounde d t o th e neares t 5°F . T o b e conservative , th e highend o f th e temperatur e rang e wa s chose ni norde r t o hel p assur e tha t ampl e quantitie s o f emission s ar e generate d fo r testing purposes . Attachment s