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Originally Posted by spliteye
Looks like my post did show up on the last page.
Last question and I'll lay this to rest. Are the injection pumps serviceable on these cars? My Ford's pump is to be replaced every 100K, along with the injectors, according to Ford and International. This is to prevent the pump from becoming inefficient, resulting in low power and poor fuel economy. I figured that was bull, however mine ended up going at around 130K. Since it's been replaced, the truck can actually climb hills with the flow of traffic. That just wasn't happening before the pump replacement.
I hear the Mercedes pumps last the life of the engine. Say it did fail before said time came. Can I service it myself, or is a rebuilt my only option?
Thanks,
Dan
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You can rebuild the delivery valves (replace a copper washer, spring, and O-ring) and replace the vacuum shut-off valve and various other O-rings that might start leaking. There is a "lift pump" which pulls the fuel from the fuel tank and provides it at low pressure to the injection pump, and also a hand-operated primer pump (incorporated into the lift pump) that is a wear item and user-replaceable.
Typically they do last the life of the car unless "repaired" by someone who has no business...
They hold the injection timing forever as well, so no need to check-adjust the timing as a regular maintenance item.
Worst case scenario: your options are either buy a rebuilt or replace with a good used pump. I prefer to the second route, but I've never had to go down that decision tree yet, after about 14 years of used MB diesel ownership. IP's which have seen VO or WVO as fuel generally are destroyed, can't even be turned in for core to be rebuilt, so if you ever do get a used replacement pump, screen those out if possible.