Matt0000 1 #1 Posted August 2, 2023 How full should my fuel filter be when running on a 520h? i put a new fuel filter on and went it started it filled up completely and ran it. After that the fuel filter doesn’t fill up completely when running. Share this post Link to post Share on other sites
8ntruck 6,998 #2 Posted August 2, 2023 My fuel filters generally run about 1/2 full. 1 1 Share this post Link to post Share on other sites
lynnmor 7,305 #3 Posted August 2, 2023 Normal to have some air in the fuel filter. Share this post Link to post Share on other sites
Wild Bill 633 845 #4 Posted August 2, 2023 If mass in = mass out, the engine will run and the gas will be filtered. 2 1 Share this post Link to post Share on other sites
