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.
When it comes to testing engines, Capt. Bill Pike has walked the walk. From pods to Liquefied-Nitrogen Gas powered boats, you name it he's reviewed it. Now see what he has to say about his first electric outboard test.
Watch the video here. ▶