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Tcmtech 
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Joined: 15 Apr 2015
Location: Minot ND
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 Topic: 7050 and8030 keeps loosing fuel pump prime.
Posted: 12 Aug 2016 at 8:21pm |
Sounds so easy and simple to figure out I shouldn't even need to ask, BUT.....
We have the twoo tractors and both loose their fuel pump primes if they sit for more than a day or two and the fact I can't track down where the air leaks are is driving me nuts.
With both 3 - 4 pumps on the hand primers and they start right up, followed by a few seconds of sputters and surging while they push the remaining air out, but if I don't they are air locked hard and will not come out of it on their own.
SO what am I missing? is there a common seal or something that ages and starts working like a check valve keeping system pressure in when I try and test it but lets the fuel drain back out after sitting for a day or two or what?
I've power washed them clean in order to look for drips or seeps and I got nothing even after hours of running yet after a day or two of sitting their pumps are air locked again.
Edited by Tcmtech - 13 Aug 2016 at 11:49am
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randy
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Joined: 12 Sep 2009
Location: Illinois
Points: 1217
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Posted: 12 Aug 2016 at 9:00pm |
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Same problem on my 8070, long story short, the return line from the pump goes to the left side fuel tank to a fitting on top of the tank. there is a line from that fitting that goes to the bottom of the tank that had fallen off. once i replaced the line all was better. With the hose on and in the bottom below the fuel line the fuel will not drain back and loose prime. Not sure about the 7050.
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CA WD WD45 D17 D17 Diesel 7060 8050 8070
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MACK
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Joined: 17 Nov 2009
Points: 7664
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Posted: 12 Aug 2016 at 9:38pm |
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Take the hand pump apart. There is two check valves that gets foreign matter in them. Clean check valves and replace o rings. MACK
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HD6GTOM
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Joined: 30 Nov 2009
Location: MADISON CO IA
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Posted: 12 Aug 2016 at 9:42pm |
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I 2nd the reply MACk gave you.
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victoryallis
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Joined: 15 Apr 2010
Location: Ludington mi
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Posted: 12 Aug 2016 at 9:42pm |
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Replace all the rubber fuel lines they are letting air in.
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8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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Tcmtech
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Joined: 15 Apr 2015
Location: Minot ND
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Posted: 12 Aug 2016 at 9:56pm |
Sorry. Forgot to mention the two primer pumps had both been gone through and the problem never improved.
I was starting suspect it may be a fuel line issue but after the washdown and wait the fact that I never got so much as a noticeable drip let alone damp spot had me ruling that out and that there had to be some seal or O-ring I wasn't finding that was giving me the problems.
I didn't think about there being a dip tube on the return line but that is worth looking at as well.
IF that not it I think that a full replumb of both is on the list. The having to pump them up every time I run one is getting old.
Thanks!
(Now if only one of you guys only knew the working pressure range for my MF 2745 multi power hydraulic circuit so I could replace that bad Hobbs switch I'd be almost be set on the bigger tractor repair work for a day or two and could get into the smaller tractors next.  ) |
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
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Posted: 12 Aug 2016 at 11:39pm |
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the bad thing is ,you can leak air in but it won't leak fuel out....very hard to find.
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victoryallis
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Location: Ludington mi
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Posted: 13 Aug 2016 at 6:28am |
 SteveM C/IL wrote:
the bad thing is ,you can leak air in but it won't leak fuel out....very hard to find. |
Bingo fuel line is relatively cheap at NAPA not sure how you would find it. My 7060 did this neighbor told me about this I thought he was nuts. Problem was gone.
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8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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Tcmtech
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Location: Minot ND
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Posted: 13 Aug 2016 at 11:50am |
New fuel lines it is then. 
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