Dozer ran good for 3 days, but ran out of fuel once. After refueling and restarting, it ran for 6 hours, then suddenly lost power and quit totally. The next day, topped off the fuel, ran OK for one hour then again lost power to about 40%. Now the dozer will barely run at idle. I suspect mechanical fuel boost pump is malfunctioning. I suspect it's located somewhere by the hand primer pump on the side of the injector pump. Can anyone offer troubleshooting advice, confirm location of pump and possible repair shops in the Albuquerque area?
It probably sucked some trash into the fuel supply line when you ran it out of fuel. Take the line loose and blow back through it with compressed air.
Yep. Then if it runs OK, run it until the tank is almost empty, drain the rest, and vacuum the rest of the junk out, remove the fitting going to the engine and see if there's a screen in there that's collapsed or plugged or torn. If it doesn't run after blowing back to the tank, hook up the suction line to a temporary tank to see if it will run, or get a fuel pressure/vacuum gauge and tee into the fuel line close to the injection pump.
That has a KT in it does it not?
For this part do a search in the Shop Talk subforum for "suck bucket".
Take off a fuel filter and see if there is fuel there, could still be a blockage between here and where you blow back from, then do as Delmer suggests. Cheers, Greg
It could well have sucked dirt/water in to the fuel filters from the bottom of the fuel tank also, They maybe plugged! Chum.
Cummins is a pretty well bulletproof system. Worked on PT pumps for over twenty five years so inner workings not a mystery. If you have a collapsed feed line will cause this, a skive in that line can act as a balloon blockage opening at whim; then there is dirt, if it accumulates around the feed fitting in the tank can deliver varied amounts of sludge or debris at odd times to the filters. Also a potential is a failing governor, on stationary as well construction equipment that run day in/day out steady RPM they develop a rub line on the governor plunger inside the housing, only way to fix is build the pump, as far as that goes can be as little as .0005 and yes 1/2 a thousandth to cause issue. If someone has decided to 'fix' his own pump and knows not what he does, there is a allen screw in the end of the throttle shaft, if exposed someone removed the anti-tamper ball to gain access, if that is the case they could have moved the throttle shaft restriction plug the wrong way trying to make more power without getting into the governor. Lots of ways to ***k it all up. If this is a Allis or Fiat engine then all options are open as to faults.