1979 Eldorado Fuel Filter Location | Cadillac Owners Forum Mar 19, 2016One video on YouTube even went as far as to call the big metal canister that I'm sure is a pump the fuel filter. RockAuto and Autozone both show the car taking what appears to be a regular little filter that you would normally find right by the carburetor, so I don't think the car has any funky big canister filters or anything like that. 1979 Cadillac Eldorado Replacement Fuel Filters – CARiD Cadillac Eldorado Gas 1979, In-Line Fuel Filter by Baldwin Filters®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind.