{"id":208674,"date":"2026-09-03T03:11:04","date_gmt":"2026-09-03T10:11:04","guid":{"rendered":"https:\/\/www.carparts.com\/blog\/?p=208674"},"modified":"2026-09-03T03:11:06","modified_gmt":"2026-09-03T10:11:06","slug":"are-a-c-o-rings-fuel-resistant-how-to-choose-the-right-seal-quickref","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/are-a-c-o-rings-fuel-resistant-how-to-choose-the-right-seal-quickref\/","title":{"rendered":"Are A\/C O-Rings Fuel Resistant? How To Choose the Right Seal"},"content":{"rendered":"\nReading Time: <\/span> 5<\/span> minutes<\/span><\/span>\n

Air conditioning (A\/C) O-Rings<\/a> are sometimes fuel resistant, but not reliably enough to guess. Most modern automotive A\/C O-rings are made from Hydrogenated Nitrile Butadiene Rubber (HNBR), a hydrogenated nitrile compound that does hold up to gasoline reasonably well, which is why plenty of technicians report using them on fuel lines<\/a> without trouble. The catch is that you usually can’t confirm what’s in the bag. A\/C seals get specified for refrigerant, Polyalkylene Glycol (PAG) oil, and pressure cycling, not for pump gas with ethanol in it. If the seal you’re replacing sits anywhere in a fuel path, buy a ring rated for fuel service rather than borrowing one from an A\/C kit.<\/p>\n\n\n\n

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