A cracked fuel filter cap can lead to air in the fuel system. That can result in hard starting or potential fuel injector issues. A cracked fuel filter cap can also cause a fuel leak, which is definitely a bad idea on a hot engine. Never worry about that again with a Sinister Diesel Lower Fuel Filter Cap. Constructed from a single solid aluminum billet, the Sinister Diesel Lower Fuel Filter Cap is far stronger than the OEM plastic cap. It's anodized in Sinister Blue for corrosion resistance and features a 1/8th" NPT port for testing fuel pressure. Features:Impervious to cracking like the OEM lower fuel filter cap, CNC Machined from solid aluminum billet, Features a 1/8th" NPT port for fuel pressure testingIncludes:(1) Sinister Diesel Lower Fuel Filter Cap, (1) O-Ring.. This product has a blue anodized finish for extra protection and a clean and stylish appearance. Sinister Diesel 03-10 Ford Powerstroke 6.0L/6.4L Oil Filter Cap. Oil Filter Cap for 2003-2010 Ford Powerstroke 6.0L/6.4L.. Oil Filter Cap for 2003-2010 Ford Powerstroke 6.0L/6.4L. 2003-2010 Ford F-250; F-350; 6.4L;6.0L. Sinister Diesel Oil Filter Cap. Engine Oil Filler Cap. Oil Filter Cap

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