Alright it sounds like its sucking air.Check every fitting going to the fuel pump,if none of them is loose look real close for a crack or if it has stratoflex lines it might be that its going bad inside,but I doubt if a tractor has lines like that.It might help to know what kind of engine,what its in,and what all else you can say about it. It could be the fuel pump itsself.On older Cummins engines they had a filter head that is held on to the back of the fuel pump by allen headed screws.You need to take the filter head off,put new flat sided o rings in to replace the old ones and tighten it back up and it should fix it for a while. Another way would be to rig up a remote fuel filter head and screw a line into the pump and eliminate the o rings.The filter head on the pump was used a lot on International cabovers. If thats not enough ask again and Ill see if I have a better answer.Feel free to give more info. Another place that can suck air is around a hand pump for the filter and also a shut off solenoid if the fuel line hooks to it.If these things have an O ring thats hard or worn out,or if they have loose screws or bolts holding them or a cracked fitting on a line like a fare anywhere before the pump it can cause this kind of thing and also even a bad spin on filter seal can do it as well.
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