Civic GX Fuel Filters and Intervals. - Natural Gas Vehicle Re: Civic GX Fuel Filters and Intervals. I got my filters back. The A filter is paper off white in color and will show any oil that gets into the system when refueling. The B filter I think catches both water and oil. I think that you have to check the B filter really soon after taking it Message Center · Blogs · Help2012 Fuel FilterHigh and Low Pressure Fuel Filters2012+ Fuel Filter Change in < 1 hrSee more results 2012 Honda Civic Replacement Fuel Filters – CARiD Honda Civic 2012, Fuel Filter by Genuine®. If your fuel system parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store.