P.1 

OAR Box 1830 

Prepped by Ollie Stewart 

Document Number: 

18) IV-B-14 

Docket Number: 

A-87-11 

Printed 11/13/2008 7:20:51 AM Sheet 18 of 232 
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

ANN ARBOR. MICHIGAN 48105 

OFFICE OF 

AIR AND RADIATION 

DEC I 3 !988 

MEMORANDUM 

SUBJECT: 

FROM: 

To: 

Results From Phases 4 and 5 of Test Plan for Passive 

Onboard Refueling Control System 

F. Peter Hutchins/ Mechanical Engineer 

Standards Development and Support Branch 

Charles L. Gray, Jr., Director 

Emission Control Technology Division 

This memo is a follow up on the memo dated August 16, 

1988. It summarizes the results of Phase 4 and Phase 5 testing 

performed by E&D in response to a June 14, 1988 memo from SDSB. 

Phase 4 

The objective of this test phase was to evaluate the fuel 

tank fill characteristics of a stock tank and of the EPA 

passive onboard refueling tank under dissimilar dispensed 

fuel/tank temperatures. The desired dispensed fuel temperature 

and 10 percent tank fuel temperature were 70°F and 100°F 

respectively. Fuel v/ith an RVP of 11 1/2 psi was required to 

be used. The specified fuel dispensing rate was 10 gpm. An 

OPW 11A nozzle was used in phase 4 testing. Fueling was 

requested to be performed from 10 percent tank volume to at 

least 95 percent tank volume. 

For the stock tank test, a stock tank, fuel filler pipe 

assembly and tank sending unit were used (GM components). The 

stock sending unit incorporated the vapor pickup and orifice. 

A stock 1.5 liter ca: Ister was used. For test purposes the 

stock canister was connected to the fuel tank by approximately 

11 feet of 5/16" diameter tubing. 
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In the case of the passive onboard system, the EPA 

modified tank, filler pipe assembly and "blue" vent valve were 

used. A 4 liter canister was connected to the vent valve by 

approximately 2 1/2 feet of 5/8" diameter tubing. The canister 

to purge control valve line was simulated by approximately 11 

feet of 5/16" diameter tubing connected to the 5/8" tubing by a 

T at the canister. The "engine" end of the 5/16" tubing was 

plugged to simulate a closed purge control valve as would exist 

during fueling. 

Phase 4 test results are shown in Table 1. Both tanks 

fueled successfully during these two tests. 

Phase 5 

Phase 5 of the testing requested to be performed by E & D 

focused on the fueling performance of three commercial fuel 

nozzles. Information collected from nozzle manufacturers by 

EPA over approximately the last year indicates that the nozzles 

selected for testing represent between 80 to 85 percent of the 

new nozzle market. The nozzles to be evaluated were an OPW 

11A, an Emco-Wheaton A2000 and a Husky 1+X . The performance 

of the OPW 11A nozzle was investigated with both the EPA simple 

onboard system and a stock GM system from which the EPA system 

had been derived. Premature shut-offs, final shut-off and spit 

back were to be evaluated at flow rates of 5 gpm and 10 gpm 

using the EPA passive onboard system. Refueling emission 

measurements were not to be performed. 

All fueling operations were initiated with 1.5 gallons 

(approximately 10 percent) of fuel in the tank. The reported 

results are summarized in Table 2. For all three nozzles, 

fueling into the simple onboard system were performed without 

either premature shut-offs, spitback, or spillage of fuel. 

Three of the four tests performed on the stock system incurred 

either a premature shut-off or a spill. 

Attachments: Tables 1 and 2 

6431W 
Table 1 

Phase 4. Dissimilar Temperatures 

Configuration 

Fuel RVP Tank 

(psi) Temp.(°F) 

Dispensed 

Fuel Temp(°F) 

Volume 

Dispensed(gal) Comments 

Stock 11•5 

Passive System 11.5 

100.4 

102.0 

71.4 

70.0 

16.2 

13.9 

No premature 

shut-off, 

spitback, or spill 

No premature 

shut-off, 

spitback, or spill 
Table 2 

Phase 5. Nozzle Characteristics 

Date 

Nozzle/ Fueling Rate RVP 

Tank (gpm) (psi) 

Volume 

Dispensed (gal) 

Temperatures 

Tank; Fuel(°F) Comments 

8-18-88 OPW-llA/Mod. 5.0 

8-18-88 OPW-llA/Mod. 5.0 

8-18-88 OPW-llA/Mod. 10.0 

8-23-88 OPW-llA/Mod. 10.0 

8-24-88 OPW-llA/Mod. 10.0 

8-30-88 OPW-llA/Stock 5.0 

8-30-88 OPW-llA/Stock 5.0 

8-31-88 OPW-llA/Stock 10.0 

8-31-88 OPW-llA/Stock 10.0 

9.0 

8.8 

8^8 

8.9 

8.9 

9.0 

9.0 

9.0 

9.0 

14.9 

14.5 

13.8 

13.8 

14.5 

15.8 

15.3 

15.3 

15.2 

81.5; 81.1 No premature shut-off. No spill. 

80.5; 80.2 No premature shut-off. No spill. 

80.0; 79.9 No premature shut-off. No spill. 

80.2; 82.2 No premature shut-off. No spill. 

80.2; 81.7 No premature shut-off. No spill. 

80.5; 79.3 Premature shut-off @5.4 gal. No spill. 

81.0; 81.0 No premature shut-off. No spill. 

81.5; 82.0 Premature shut-off @ 0.1 gal. (nozzle 

position). No spill. 

81.5; 79.7 No premature shut-off. 1/2 cup spill. 

8-25-88 Emco-Wheaton 

A2000/Mod. 

8-25-88 Emco-Wheaton 

A2000/Mod. 

8-26-88 Emco-Wheaton 

A2000/Mod. 

8-26-88 Emco-Wheaton 

A2000/Mod. 

5.0 

5.0 

10.0 

10.0 

9.1 

8.9 

8.9 

8.9 

15.6 

14.6 

14.6 

14.3 

80.5; 80.1 

81.5; 79.9 

81.0; 80.4 

81.9; 81.2 

No premature shut-off. No spill. 

No premature shut-off. No spill. 

No premature shut-off. No spill. 

No premature shut-off. No spill. 

9-7-88 

9-7-88 

9-7-88 

Husky 

Mod. 

Husky 

Mod. 

Husky 

Mod. 

1+X/ 

1+X/ 

1+X/ 

5.0 

5.0 

10.0 

9.0 

9.0 

9.0 

14.1 

15.0 

14.7 

81.3; 81.9 No premature shut-off. No spill. 

81.0; 80.4 No premature shut-off. No spill. 

81.0; 81.3 No premature shut-off. No spill.