Cat C7 Heui Pump Problems

The engine configuration was the same as the 3126 but the fuel system changed using a new engineered style known as the heui injector. Remove the two 10 millimeter bolts with 16 millimeter heads hold the heui pump onto the engine. Bit like the old 33 series engines no1 main bearing got the same treatment have a guess which one sht first but your right bext thing to do is keep up with oil changes and use the best filters available rare ss feb 17 2013 41.
cat c7 heui pump problems

Here are 14 steps to follow to take out and install a new heui pump on a caterpillar c7 or c9 engine.

Cat c7 heui pump problems. Many times when you have a heui pump failure metal debris comes out of the heui pump and damages all the injectors. The early c7 engines were heui. Even though you have replaced the fuel pressure regulator you could have a problem with the fuel transfer pump. If the coolant line runs over the compressor youll have to remove that.

Your symptoms sound about right for a heui pump problem. Cat c7 commonalities with cat 3126 the cat c7 shares many common configurations with the cat 3126. They also had the fairly early version of the hep heui pump and were prone to breaking springs on the delivery valves of the high pressure pump. If it is low you most likely have a weak transfer pump.

The dealer should have the tools to dead head the pump and check to see what the maximum pressure it will build. Biggest trouble is the feed for the heui pump does not get filtered oil just straight fom the sump. The c7 needs at least 25 psi to start. Remove the fuel filter housing.

Its kind of known failure mode on cat c7 engines. Remove the oil supply line to the pump. I would install a psigauge and check the fuel pressure while cranking. I have seen this many times before.