Hi folks this is my first time on here, I was after a bit of advice or help. My 1996 model jd6800 has recently been playing up. Basically it keeps air-locking. I replaced fuel pipes, got pump reconditioned, replaced fuel sender unit and fuel lift pump and also the fuel filter. So after doing all that and after getting it bled and going the tractor will go for a short time ( could be 10 mins or could be 2 hours) but it will just stop dead. Then needs bled and goes again. Has anyone ever had the same problem or can anyone give me some advice please. Thanks in advance
John Deere problem
- Thread starter Ady 41
- Start date
I’ve changed the filter since this happened do you know if there is another filter that I’m missing then?
- Location
- North Devon
When you open fuel cap does air rush in. Blocked breather pipe can cause vacuum build up starving lift pump
john432
Member
- Location
- Carmarthenshire
I have never fully worked out when the electric lift pump is powered and when not? Their not powered when the ignition switch is on,without the engine running, but powered when forward or reverse is engaged and switch turned to start position, the bleeding method. But the tractor can run ok with a failed lift pump, untill the filter is changed! I'm confused.
Confused also!!!
The tractor is full of fuel so I’ve no reason to open the fuel cap. As for the breather pipe I’ve never checked but do you think this might be the problem??
- Location
- North Devon
From memory the 00 series pumps ran when ignition was turned on. Ours used to stick and needed a tap to get it going. As you said engine would run fine even with faulty pump until you let air into system.
- Location
- Welshpool Powys
Is there a glass bowl under the filter on them or not?
No there’s not
Yes but how would the air be getting into the system when the tractor is working? And there is no visual signs of a fuel leak or am I missing something
- Location
- Welshpool Powys
Have you checked the filter head ?
Yes but how would the air be getting into the system when the tractor is working? And there is no visual signs of a fuel leak or am I missing something
Also I’ve changed the pumps twice thinking they where faulty.
john432
Member
- Location
- Carmarthenshire
Is anyone 100% sure the lift pump is powered when the engine is running? or only when the starter is engaged?
cowmechanic
Member
Cracked fuel filter housing on a jd 6900 replaces with one from motor factors , cheap as chips and filters are only a fiver
StanthemaN
New Member
Fault injector with air bleeding back up injection pipe ? Had one on a Bateman
- Location
- North Devon
It’s a quick and simple thing to check once tractors been running a while. If it sucks in loads of air then it’s worth checking breather, if not don’t bother. Another clue would be if it runs longer on an empty tank than a full one.
My understanding is that it’s just when the starter ingaged but not 100% sure
StanthemaN
New Member
6000 series run when starter is cranking only and on 10s and 20s and all later run with the ignition on all time apart from vp44 pumps which shut off with a pressure switch control
john432
Member
- Location
- Carmarthenshire
Thanks @StanthemaN , that explains, so it must be drawing in air somewhere?