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Is it correct type of hose, injection system fuel hose for moderm ethynol fuel blends is specific type and carries a SAE code printed along it's length - example: SAE J30R9 for a modern high standard non submursed hose, You do have ISO and DIN standards and you best cross referencing those as and if needed . Can be quite difficult getting right type/quality aftermarket as majority of common/easy sources likely stock cheapest garbage they can source and a lot will sell you wrong hose as they clueless or just want make money from selling something . As with most things you buy these days that need quality/design/function specifics you got be fussy on how you source them . Other things to check would be fuel system pressure being controlled correctly .