John Deere 1070 spewing fuel at rpms higher than idle.

wsivik1

New User
Hello there, I have a John Deere 1070 that has been having some issues lately. Last week it was starting to bog down on me, I would have to pump the fuel pedal to bring it back up to operate properly. I figured it was bad fuel so I completely drained the tank, lines, and changed filters. Then I primed the lines and got it started. It ran great for about 6 hours and started bogging down again. Today I start it just fine but when I give it fuel and rpms are higher than idle fuel starts pouring out of the overflow hose located by the oil cap on top of the engine. Video is posted. Any help and input is much appreciated.
 
The engine oil is full of fuel either the injection pump or the fuel pump is bad My guess is the
fuel pump .
 
(quoted from post at 16:01:47 03/16/18) The engine oil is full of fuel either the injection pump or the fuel pump is bad My guess is the
fuel pump .
Thanks. That's what I was thinking but wasn't sure and I am not to familiar with the engine on here.
 
Check your oil level,if it is blowing fuel out of the breather,you have a crankcase full of fuel.
Best case scenario is the transfer pump is bad, leaking fuel into the oil, worst case is seal on
injector pump has failed letting fuel into the crankcase.Don't run it until you find the source of the
fuel in the oil. Once that is repaired,change the engine oil and filter before it spins a bearing.
 
(quoted from post at 16:09:23 03/16/18) Check your oil level,if it is blowing fuel out of the breather,you have a crankcase full of fuel.
Best case scenario is the transfer pump is bad, leaking fuel into the oil, worst case is seal on
injector pump has failed letting fuel into the crankcase.Don't run it until you find the source of the
fuel in the oil. Once that is repaired,change the engine oil and filter before it spins a bearing.
Is the transfer pump and fuel pump two separate parts or are they the same? I can't seem to find the location of a transfer pump in my shop manual or online. I know where the fuel pump is. Also is there any tell tale signs of the pump being bad once I remove it? It is my Boss's tractor and I have not been around the engine long enough to know what's what on it. However I do have mechanical experience on vehicles so I'm not a total newbie to mechanics.just want to make sure I'm checking the right thing.
 
Follow the fuel line from the tank, it will lead you to 1st, the transfer pump, from there to the injection pump.
There are usually 2 lines at the tank, one is a return direct from the injection pump, you want the other one, DON'T RUN IT!!
 
(quoted from post at 18:11:00 03/16/18) Follow the fuel line from the tank, it will lead you to 1st, the transfer pump, from there to the injection pump.
There are usually 2 lines at the tank, one is a return direct from the injection pump, you want the other one, DON'T RUN IT!!
Thanks for the info. What am I looking for to tell if the transfer pump is bad?
 
(quoted from post at 20:15:55 03/16/18)
(quoted from post at 18:11:00 03/16/18) Follow the fuel line from the tank, it will lead you to 1st, the transfer pump, from there to the injection pump.
There are usually 2 lines at the tank, one is a return direct from the injection pump, you want the other one, DON'T RUN IT!!
Thanks for the info. What am I looking for to tell if the transfer pump is bad?

STRANGE that no one has suggsted checking the engine oil dipstick to see how thin with fuel the oil is and how overful it is.

The fuel transfer pump is bolted to the side of the main injection pump, Key # 28, Part #AM882577, more than $160.

If you need one, I would check at a local diesel injection pump shop to see if they had a more reasonable source.

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Thank you everyone for your input. Sure enough there is diesel in the crankcase. I am going to try and have the owner just bring it to a shop. It needs a good all around tune up and a few other issues fixed. Unfortunately I do not have the expertise to fix every issue and run the risk of making things worse.
 

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