Introduction: The ceramic gas pump plunger tappet (section 4088593) improves diesel motor reliability and gasoline shipping efficiency, making sure compatibility with Cummins ISC 8.three and Paccar PX8 designs.
because https://www.shilindiesel.com/blogs-detail/a-closer-look-at-fuel-injection-pump-plunger-tappet-features-and-benefits