Bleeding fuel on a MF8670 (8.4Sisu)
c_mayer
Posted 1/31/2026 10:09 (#11534239 - in reply to #11534201)
Subject: RE: Bleeding fuel on a MF8670 (8.4Sisu)


Jeffersonville, OH
1066smoker - 1/31/2026 10:43

Anyone ever have trouble getting it to pump up and bleed? Changed the water separator, and both primary and secondary filters. Went to bleed like I’ve always done (Rogator and this 8670) and I can’t get any fuel to flow….not a drop. I am about to condemn the primer even though I don’t think that’s really the issue here. I’ve cracked and couple screws and it hasn’t helped, even added a little air to the tank to help push fuel and that hasn’t helped either. I’m about out of ideas.

I did put the filters on dry (I always have)

TIA


Should just have to pump it, no screws to loosen, it has a purge valve on top the filter to push air back to the tank.

I do see primers fail, but not that often, 1 a year or so...and we use that on literally every AGCO Power engine, so it's not a high percentage.

Did you fill the first filter?
Chris
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