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7040 losing prime

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AllisFreak MN View Drop Down
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Joined: 07 Dec 2009
Location: Minnesota
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    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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mattman Quote  Post ReplyReply Direct Link To This Post 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.
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nanuk View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nanuk Quote  Post ReplyReply Direct Link To This Post 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
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