Ford Powerstroke Diesel Forum banner

nipple cup

  1. General 6.0L Discussion
    This is a Write-Up on the Top Fuel Injector Seals & The Nipple Cup O-Rings in the High Pressure Oil Rail If you find a leak at one of your top injector seals you probably have a leaky nipple cup also... Don't learn the hard way like I did ~How to Diagnose and Replace~ Fact 1: The top injector...