7040 losing prime

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   My 1975 7040 just recently started losing its fuel prime if it sits for a couple weeks or more. I have to pump the primer and then it will start. It runs fine once started and if it's only a few days in between it will start fine. The primer plunger was replaced with a new one a couple of years ago.  Any idea what would be causing this?  Thanks.

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AllisFreak MN Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 07 Dec 2009 Location: Minnesota Points: 1543	Post Options Post Reply Quote AllisFreak MN Report Post Thanks(0) Quote Reply Topic: 7040 losing prime Posted: 09 Sep 2024 at 8:10pm
	My 1975 7040 just recently started losing its fuel prime if it sits for a couple weeks or more. I have to pump the primer and then it will start. It runs fine once started and if it's only a few days in between it will start fine. The primer plunger was replaced with a new one a couple of years ago. Any idea what would be causing this? Thanks.
	'49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2

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Mattman Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 20 Dec 2012 Location: Plover, WI Points: 174	Post Options Post Reply Quote Mattman Report Post Thanks(0) Quote Reply Posted: 09 Sep 2024 at 8:45pm
	I had same issue. I had to change tank to pump supply hose. Didn’t leak fuel but sucked in air. Learned that on this site. Hose I removed looked good but haven’t had to prime it for 7 or 8 years since changing it. They deteriorate and let just enough air in to drain back and lose prime.

nanuk Members Profile Send Private Message Find Members Posts Add to Buddy List Silver Level Joined: 22 Aug 2013 Location: Saskatchewan Points: 257	Post Options Post Reply Quote nanuk Report Post Thanks(0) Quote Reply Posted: 10 Sep 2024 at 10:34am
	my 7060 is with issues too my prime plunger rubber disintegrate. I was able to source a new plunger from the "Local" (45min drive) dealer, for just under $100. They said they couldn't get the rubber separate. now, when I prime, I can hear air coming out the pump. I'm looking into getting the seals/gaskets for the pump and replace them. it runs, but is rough with no load and from idle to 2/3 throttle. once under load running PTO/RPM, it seems to run OK, with the frequent pulses.... only have one so no time to tear into it right now.
	AC7060Pd 1975