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cowkicker 
Orange Level Access
Joined: 21 Mar 2010
Location: Ky
Points: 542
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 Topic: hardarti starting 8070
Posted: 02 Sep 2026 at 9:43pm |
my 8070has always started verywell. it sat all winter and started right up this spring. foward to now and now it acts like the inj pump looses its prime
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DrAllis
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Joined: 12 Sep 2009
Points: 23482
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Posted: 02 Sep 2026 at 10:50pm |
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If it was mine, I'd probably replace the fuel hose that goes from the fuel filter on the left side of the tractor and crosses over under the water pump to the injection pump. That hose may be original and 44 years old.
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8070nc
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Joined: 21 Mar 2019
Location: North Carolina
Points: 896
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Posted: 03 Sep 2026 at 4:44am |
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You might want to replace the return hose that goes from the injection pump to the tank too. I had one doing the same thing. Started repacing hoses and when i changed that one it fixed it. I woundnt have thought the return would have caused it but it did on that one
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Kevin in WA
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Joined: 08 Feb 2010
Location: Lynden, WA
Points: 624
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Posted: 03 Sep 2026 at 4:48pm |
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Also check the return line drop tube in the tank, they have a habit of falling off, it has to be there or it will crank an extra 5 seconds or so after sitting overnight.
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 9196
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Posted: 04 Sep 2026 at 7:07am |
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Had one like that. Fall came and need primed if sat more than a day. PIA to operate that primer! Never diagnosed it cause it got an inline pump that winter
Fine since.
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SilverShoes
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Joined: 20 Feb 2014
Location: Seneca, Kansas
Points: 224
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Posted: 04 Sep 2026 at 6:44pm |
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Plunger in the primer might be leaking back
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victoryallis
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Joined: 15 Apr 2010
Location: Ludington mi
Points: 2907
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Posted: 06 Sep 2026 at 10:03am |
 DrAllis wrote:
If it was mine, I'd probably replace the fuel hose that goes from the fuel filter on the left side of the tractor and crosses over under the water pump to the injection pump. That hose may be original and 44 years old. |
Experienced something similar on a 7060 and 7080. They don’t leak fuel out but let air in.
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8030, 7060, six 6080’s grandpa’s D17, 8760, 8100, and 8970 Deere.
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