By now you’ve heard of all the problems surrounding the Bosch CP4.2, the high-pressure fuel pump that’s made its way onto most common-rail engines in the pickup truck segment. You know the story well: the pump self-destructs, sends metal fragments through the lines and rails, into the injectors, and then out the return circuit.
The failure is rarely noticed before it’s too late, and by then you’re usually out a pump, lines,rails, injectors, a tank cleaning, 30 hours’ labor, and anywhere between $6,000 to $10,000. As expected, this potential catastrophe has many late-model truck owners a little uneasy about their $60,000 to $90,000 investments.
With its ultra-tight tolerances, the CP4.2 does not tolerate anything other than diesel fuel very well. But which unwanted contaminant is most common? Air. That’s right, aeration is the number one killer of these pumps.
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I’m a big fan and love watching your show. I have an interesting vehicle that you may be interested to learn more about. I believe it’s one of the better platforms to build an adventure vehicle. It’s an ’88 Volkswagen LT 4x4 with a 2.4L turbodiesel engine and Hurth axles with front and rear locking differentials. Earlier models used Dana 60s, and much of the platform is very similar to older American trucks.
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