Lesson 2/Learning Event 3
Another trouble that you might find is that the engine stops because of no fuel being injected into the
cylinders. This could be caused by many different conditions. Let's see how to proceed to locate the cause
of this trouble.
Remember, don't start removing parts. Make a good visual inspection of the fuel system first, to include
checking that there is fuel in the fuel tank. Make sure the fuel lines are not cracked or broken.
Examine the linkage to the fuel injector pump. The accelerator linkage could be disconnected and, with the
idle speed adjustment set wrong, the cylinders would be out of fuel. Another linkage item that could cause
this trouble is the fuel shutoff control. Make sure it is not improperly adjusted. Check to see if the shutoff
control cable housing has slipped rearward out of the clip on the fuel injector pump. This condition can
cause the trouble, as it has the same effect as pulling out the control in the cab.
If you cannot see anything wrong, check to see if the fuel lines are open from the tank to the fuel injector
pump. This can be done by first disconnecting the fuel line at the inlet side of the injector pump hydraulic
head. Then, turn on the accessory switch and see if fuel is pumped from the tank through the line. Make
sure you catch the fuel in a suitable container.
In the above inspection, you are finding out if the lines are not plugged and if the in-tank pump is operating.
If the fuel does not flow out of the disconnected line, the trouble has to be back toward the tank. If the
fuel does flow, the trouble must be in the fuel injector pump high-pressure lines or injector nozzles.
If no fuel flows, there could be many reasons. The lines and filters could be plugged, or the in-tank pump
might not be operating. If you listen, close to the tank, you can hear the in-tank pump humming when it is
operating. If the in-tank pump is operating, you can check its pressure. If the in-tank pump does not
operate, check out the electrical circuit to the pump.