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10 samplesto eachtest proceduremustbe provided,with all samplespassingthe AcceptanceDeterminationrequire-

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1996 General Motors Ccqmaticn All Riihts Resewed GM GM9080P 9b m =jOOb37q 0007bqq

620 m I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Procedures PROCEDURE FOR QUALIFYING NYLON HOSE COUPLING GM9080P ments.The

10 samplesshall consistof

5 samplesfrom

2 lots the assemblyis a nylon and steeltube assembly,the limit for of assemblies. materialcollectedshallbe 0.26 g/m. Test samplespreparedmay be used to qualify two different typesof nylon tubing interconnections by the incorporationof each of thesetwo nylon tubing interconnectionson opposite endsof one test sampleassembly.Test of

10 sampleassem- blies preparedin such a mannerto the Burst Test (5.3) for example,would qualify two typesof nylon tubing interconnec- tions to the requirementsof this test. 5.3 BURST. 5.3.1 TestProcedure. The burst test shall be in accordance with ASTM D380. 5.3.2 AcceptanceDetermination. The minimum burst pres- sureshall be

3100 kPa. 4.1.1.2 Unlessotherwisenoted,all testtemperatures shall be held to -L2°C and all testpressures to f

35 kPa. 5.4 PRESSURECYCLING, LEAK TEST,BURST.

5 TEST REQUIREMENTS. 5.1 LEAK TEST. 5.1.1 TestProcedure. Attachnylon fuel systemassemblyto a suitablefixture which has mating fittings identical to those usedon the vehicle.This fixture mustengagethe barbsof the quick connectorsuchthat the connectoris beingheld in place by itself, without the aid of addedfixturing. The outerdiame- ter of the fitting must be the minimum allowed by the design of the vehicle fuel system.Pressurizethe systemwith air to 1035It

35 kPa and thendetermineleakage. 5.4.1 TestProcedure. Attach nylon fuel systemassemblyto a fixture which hasmatingfittings identicalto thoseon thevehi- cle. The outer diameterof the fitting must be the minimum allowedby the vehiclefuel systemdesign.Subjectthe hoseto

15000 cyclesof the pressureprofile tabulatedbelow (10 s per cycle). A hydraulic pressure system, utilizing GM Part 9985257or other GM Engineeringapprovedfluid as the test fluid, is to be used: 5.1.2 AcceptanceDetermination. Leakageduring the test is to be lessthan8 cc air/minute(no leakageof fuel). The equip- ment and procedures used must be capable of detecting leakageof

8 standardcc of air/minuteat the specifiedair pres- sure.Specifictestproceduresand equipmentfor eachsupplier musthaveGM Engineeringapproval. Time, s