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JD63

12 valve cummins in a rogator

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I have a 2000 rogator high clearance sprayer and it has a 12 valve cummins with the inline pump. After last season it was in the yard idling and all of it sudden it started to flutuate. I changed the fuel filters and took it out the field and opened it up to fuel throttle 2350 rpms and then it started to flutuate all over the place.do you think its the transfer pump and if it is what will a fass system do for me in this application Thanks JD63

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what should the pressure be on the transfer pump for the 5.9 with a 7100 on it, also if the transfer pump is gone will it take out the injection pump like it does on the vp44, and also what differences does a fass system have over a stock transfer pump on my set up Thanks jd63

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vp is fuel-lubed. 7100 is oil-lubed.. is the transfer pump not a mechanical one on the block? Or is it electrical style?

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Make sure the fuel lines are good. I see on ag equipment all the time that it gets dry and cracked and suck air. Some times they smoke also. Just fixed a fuel line on a New Holland Bi directional tractor a few weeks ago that had a bad fuel line feeding the cummins in it also, that one smoked pretty bad and wouldn't even go to high idle it was sucking so much air.

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