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Message: [QUOTE="Big Bore, post: 294234, member: 760"] After doing a lot of research and emailing AD apparently the AD100 does in fact filter before the pump, which leaves one a lot of speculation as to why the pump fried. I found posts on several diesel forums with others having the same problem. AD was fixing them under warranty, as long as your warranty was good. Mine unfortunately was not, even though I had less than 40K on it. My opinion? Skip the AD. If you do a prepump separator and post pump filter into a regulated return, you will be doing the same thing. Some people like Tarm are using a Carter pre-pump/lift pump. I'm not sure I like that as it's one more pump to fail. I'm beginning to like the dual stock pump idea more and more vs the Walbro I'm currently running, since it gives redundancy to the system in case of a pump failure and the stock Bosch pumps last a long time, in tandem should last even longer. If a lift pump fails it can become a restriction and cause premature primary pump failure. [/QUOTE]

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