JCB Backhoe Stalling

My JCB 1400B is driving me nuts, it acts like it is getting air into the fuel, I"ve bled this thing and tightened fittings at least a dozen times now, today it started fine, and ran great long enough for me to ge about 14 of the round bales out of 50 off the field, then started reving up and slowing down, then died again. I let it sit a while, then started it right back up. What am I missing??? Is it getting hot, and it that causing the problem, if so, what is getting hot and what should I try to do to fix this. All help and ideas would be greatly appreciated.

If you suspect its air getting into the system, Are you getting air at the fuel filter? Is that a common rail type fuel system or individual lines to the injectors?.

possibly fuel restriction comming out of fuel tank.There might be a screen plugging.

Is your fuel tank well vented?

Is your fuel tank well vented?

Simple things first.. do you have good flow to the lift pump...are the fuel filters clean,...is the vent on the fuel tank or cap clogged not allowing the tank to vent which will eventually cause the engine to starve for fuel?
If you suspect it is sucking air, install a piece of clear plastic line in the return to the tank from the Injector pump...if you see bubbles in this line it has an air leak somewhere.
Another possibility is the return fitting on the injection pump is clogged with debris or pieces of the governor ring which will give you the same symptoms. When it shuts off and sits for a minute or two it relieves pressure in the Injector pump and allows it to restart.

Does it have a spin on filter?Ive only seen pictures of a JCB backhoe,never even seen one up close.If there is some place that when it gets hot swells up and it can suck air,but when it cools off shrinks up and doesnt suck air,would be my best guess.Take you some wrenches with you and when it starts doing that see if there are any fittings you can tighten up.I used to pull trailers with a Thermo King reefer on them and they have a fuel pump.A lot of times in hot weather the fitting where the line hooks to the tank would be loose and it would do the same thing,or just quit running.On Cummins diesels with the filter head on the fuel pump,they have some allen head screws that hold the filter head to the pump and if you take it off there are some square o rings in there.just put in new square o rings and tighten it back up and it would fix the problem.On other diesels Ive seen a spin on filter be bad where they crimped the seal on it.You couldnt tighten them up enough because it was warped and still would suck air.So there are some ideas,I dont know how much help they are.I would for sure check the fittings from the tank all the way to the fuel pump and see if there are any that are loose.Then if that doesnt work,I think I would call JCB and ask them if they know what would be causing it.Maybe its a common problem and they know what to fix?

Is part of your fuel line a flexible hose, if so check for cracks or splits in it. I have found cracked hoses causing problems like that.

Last year I relaced the Line from the tank, the filter housing on the frame rail under the tank, the line from the filter housing to the Lift pump, and the lift pump, all for the same issue, and it seemed to fix it, until now. Of course I do not use the machine that much, and it may just have been it didn't get warm enough to cause the issue again, until now...

You all were right, I went thru the entire fuel system and tightened everything again, including the Fuel Filters.... It turns out that when I replaced the filters, apparently I did not tighten them enough, though with my history of breaking things due to being too aggressive, I was afraid of breaking the glass bowls and therefore did not give them that extra turn "Just to make sure" When I checked them one of the filters easily took 3 turns with the wrench before it got "Snug" again. After that it is running like it used to with no problems at all. Thanks to all that replied.