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Message: [QUOTE="Decker, post: 1458167, member: 19689"] Bringing this thread back up, I was wondering about this the other day. At wot or quick punch my fuel pressure drops down below 45. I have blue spring and have replaced pump with a new racor pump. But I can't seem to hold pressure I was looking to add a lift pump. I like the idea of having a 6.4 pump for reliability and being able to get new pump anywhere. I got a 6.4 pump and housing to put on but got to thinking about all the connections and made me wonder about putting the 6.4 pump in a 6.0 housing. It be much easier to set up and wouldn't need to change return line. Would the smaller lines hinder the 6.4 pump? But I was thinking of my options I could go with 6.4 inline with 6.0 - known to work 6.4 pump in 6.0 housing inline with 6.0 pump? Anyone try this? 2x 6.0 pumps inline? Would the fuel pressure be to high? [/QUOTE]

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