Join Date: Mar 2007
Thanked 134 Times in 130 Posts
The simple description is a supply line from an inch above the bottom of the tank to a filter or lift pump ( most are lift pump ) , there may be a second filter then the injection pump. There is pressure in the injection pump at all times that goes to the return line to cool and wash the pump and injectors.
The injectors leak ( it is intensional ) and return through the return line. Air compresses so it will not pop an injector but will mostly find the return line and cause a miss while it is passed through the lines.
Restrictions will cause a vacuum where it needs pressure to work well, that the engine shuts down indicates that the vacuum is low enough to cause the fuel to vaporise and compress. But the vacuum keeps sucking and pulls more fuel so it will start agin. To find out where the normal thing to do is plug a substitute fuel line into the machine depending on where you can get to it. If it runs on the fuel can the restriction is closer to the tank.
It may be simpler to drill and tap the top of the tank for a new dip tube. If you do set the dip tube 1/2 to 1 inch above the deepest part of the tank if possible - leaves room for a little trash to settle and have no effect on the machine running. Putting the dip tube at the deepest part makes service easy - exchange the dip tube for a longer tube to suck all the bottom scurfus, water and rust out. Or set the tube at the bottom with notches for fuel flow and catch all the stuff in the filter.
A lot of equipment is set up to discourage operator err, if they can't get to it, they can't mess it up - 22 bolts to check the engine temp sensor connection or get to the rocker cover to check the valve lash. Another is 16 bolts and 240# of belly pan to adjust the clutch. Changing the way they press the belly pan could make it 2 bolts and 10# of cover.
93 Dodge /CTD, IC, 518, club cab LE, BHAF, KDP fixed, kelderman air ride
81 Isuzu /C223na, 5spd