Serial gmk00505 Having an issue with thos d6 error code e198-2 machine has 11k hours just put a new fuel pump (gear pump) it has had a new priming pump also within the last 70 hours. Dozer idles fine and runs fine till you load the blade up. We put a nee fuel pump on after running the fuel system verification test with et and it came back as low flow from pump so we just changed it. Trying to run the test again but cant get it to run because of the acive code. Fuel pressure on et is really bouncing around anywhere from 0 to a max of 69 psi. Fuel rail pressure is about 100 psi lower than desired. Just curious to see what you guys are thinking. Regulator possibly or sensor maybe?
We did get a low rail pressure code once but dont remember the code # and didn't write it down before clearing it
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No visible fuel leaks. Checked fuel cap vent didn't notice anything out of the ordinary
I should have said that the fuel filters were replaced also at the time of pump replacement
John, Have you confirmed that you have good fuel supply with no restrictions coming from the tank? Also, have you put a mechanical gauge on the fuel pressure to see what it is actually reading? Below is a chart of the fuel flow on your machine. Fuel system diagram (1) Solenoid for the high-pressure fuel pump (2) High-pressure supply line (3) Cooling supply to injectors (4) Fuel injector (5) Rail Pressure Sensor (RPS) (6) Fuel rail (7) Pressure relief valve for the fuel rail (8) Pressure regulator for the drain line (9) Fuel tank (10) Check valve for the fuel return (11) Fuel to the Clean Emissions Module (CEM) (12) Electric priming pump (13) Primary fuel filter/water separator (14) Engine control module (ECM) (15) Fuel pressure sensor (secondary filter outlet) (16) Secondary fuel filter base (17) Fuel pressure sensor (secondary filter inlet) (18) Transfer pump (19) High-pressure high-pressure fuel pump (20) Speed/timing sensor
This tells me that there is air or a flow problem. I leaning towards air since you have done work to the fuel system.
Does that have a metal in line strainer that is between the tank and electric priming pump? I have seen those plug and throw that code, sometimes they aren't real obvious. I would assume it is easy to see on that machine like it is on our D-6 N's but on a 316F it is buried beneath the fuel tank and you have to pull the plate off under the tank to find it.
Im not sure about the strainer i will look. I really appreciate the diagram i will see if i get over to the machine in a little bit were covered in ice here right now. Im going to check for air intrusion since the new pump is actually fluctuating way worse than the old one was. The other pump actually showed better pressure. I will post when i get back to the dozer. Thanks.
John- Your machine does not have the suggested inline screen. I’d concentrate on the fuel supply to the transfer pump from the tank, double check the ball valve on the tank, remove the line on the valve and make sure there’s no restriction at the tank. If you’re able, I’d get a gauge on it to measure the low pressure fuel at the sensor. Check water separator base to make sure there’s nothing floating around in there. Once you confirm there is good fuel supply, need to check the return side for restriction. There are two return checks on the left rear of engine that can be checked/replaced if the line going back to the tank is clear.
It ended up being a restriction in the fuel line from the tank. Got that cleared then cleaned out the tank sediment. All is working good at this time. Thanks for all the help.
Do you have any idea when water & sediment was last drained from the tank.? It's supposed to be every PM but a lot would depend on the cleanliness of the fuel being put in the tank.
Another bit of advice, make sure the tank strainer is installed under the fuel cap, will help keep the big stuff out of the tank. Part number: 9P-7121
Looking back through this thread it never ceases to amaze me how often parts get thrown at a machine before the basics have been checked and eliminated. This is a classic case of where a good PM regime would be worth its weight in gold IMHO.
You’re definitely right nige. When diagnosing a fuel problem, always start at the source, every time.
One of the first things I do is blow back through the line from the tank from the primary fuel filter, amazing how often it is crud in the tank, it also amazes me the random stuff I find in the tanks when I clean them. Ahart is right, keep the strainer if it has it!
This reminded me of a 6k. Customer called me with this code. Grabbed some fuel filters despite the recent service, put them on with him standing over my shoulder. Went to back of machine and pulled the access cover over and ball valve had bounced half closed. One zip tie later and they were spinning tracks
I learned a lesson I’ll take with me when I go, no matter how long it takes. 773 haul truck at a quarry, driving along and all the sudden would stall out and nearly die. Put a fuel pressure gauge on it and you could see the pressure go to zero when this happened. Started at the tank and ended up finding rocks in the primary filter and housing. They had removed the screen from the tank fill. The rocks went all the way up the suction tube, through the ball valve, through 18ish feet of fuel line and into the water separator. I was quite impressed by the distance they traveled.