New common-rail engine fuel pressure is so high it can literally slice skin like a scalpel. While you should never attempt to bleed anything past the secondary fuel filter on a common-rail diesel, you really shouldn’t have to. Such engines typically bleed themselves. With the new Cummins’ B-series engines, for example, just turn the key. The engine’s electric fuel pump draws fuel and purges air through the Racor fuel filter, secondary filters, and the entire fuel system.
Some common-rail engines do have to be bled through the secondary fuel filter, however. Even with a Reverso Fuel Primer installed, you’ll have to crack bleed screws to release air, since common-rail engines return very little or, more typically, no fuel at all to the tank.
One more warning: Never fill common-rail secondary filters from a jug of diesel after installing a new element—just a bit of contamination in that jug sneaking past the element may cost tens of thousands of dollars for repairs. That advice, by the way, holds for most modern diesels, common-rail or not.
Capt. Bill Pike recently returned from an extensive test of the Bertram 35. The first boat built under new ownership, this build has a lot riding on it. Get Bill’s first take here with a teaser of things to come on image 15.
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