Fuel leaking out the top of the filter housing. | Diesel Sep 28, 2012I started looking in all the usual spots around injectors and return lines and so no sign of fuel in those areas. After I made it home and could look further, I finally found an area that was greasy looking on the top of the fuel filter housing. It seems to be leaking out of the electrical plug on top of the housing.94 7.3 idi turbo fuel filter housing leaking | DieselMar 12, 20187.3 Fuel Heater Delete Pipe Plug | Diesel Truck ForumMar 25, 20147.3 fuel filter heater plug leaking | Diesel Truck ForumFeb 22, 2011Fuel filter housing leak | Diesel Truck ForumNov 16, 2009See more results DIY Duramax Fuel Fix for Leaky Filters - Diesel World External fuel leaks can develop as well, and will be evidenced by fuel puddles on the ground or on top of the filter assembly. If you have a high-mileage Duramax-powered truck and suspect that it’s losing its prime, or you have seen evidence of fuel leaks from the filter head, you’ll want to address the problem as soon as possible.