Designation:D6421−99a(Reapproved2014)StandardTestMethodforEvaluatingAutomotiveSpark-IgnitionEngineFuelforElectronicPortFuelInjectorFoulingbyBenchProcedure1ThisstandardisissuedunderthefixeddesignationD6421;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversabenchtestproceduretoevaluatethetendencyofautomotivespark-ignitionenginefueltofoulelectronicportfuelinjectors(PFI).ThetestmethodutilizesabenchapparatusequippedwithBoschinjectorsspecifiedforuseina1985-1987Chrysler2.2-Lturbochargedengine.ThistestmethodisbasedonatestproceduredevelopedbytheCoordinatingResearchCouncil(CRC)forpredictionofthetendencyofspark-ignitionenginefueltoformdepositsinthesmallmeteringclearancesofinjectorsinaportfuelinjectionengine(seeCRCReportNo.592).21.2Thetestmethodisapplicabletospark-ignitionenginefuels,whichmaycontainantioxidants,corrosioninhibitors,metaldeactivators,dyes,depositcontroladditives,demulsifiers,oroxygenates,oracombinationthereof.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Approximateinch-poundunitsareshowninparen-thesesforinformationpurposesonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tionarystatementsaregiventhroughoutthistestmethod.NOTE1—IfthereisanydoubtastothelatesteditionofTestMethodD6421,contactASTMInternationalHeadquarters.Otherpropertiesofsignificancetospark-ignitionenginefuelaredescribedinSpecificationD4814.2.ReferencedDocuments2.1ASTMStandards:3D4814SpecificationforAutomotiveSpark-IgnitionEngineFuelD5598TestMethodforEvaluatingUnleadedAutomotiveSpark-IgnitionEngineFuelforElectronicPortFuelInjec-torFouling2.2ANSI...
