Cat 289D Engine miss

[Micah 1989]

Is there a sensor or a certain pressure that the ECU needs to see for it to continue to run? How much pressure should the relief valve hold? It seems electrical the way it fires and immediately shuts down

 

[Nige]

Is there a sensor or a certain pressure that the ECU needs to see for it to continue to run? How much pressure should the relief valve hold?

From memory the relief valve #1 shown in the fuel line sillustration in Post # on Page 1 is only something like 1.5psi. The HP pump is apparently quite sensitive to being fed fuel at too high a pressure.

Attached something on the fuel system, but it relates more to the HP pump and injection delivery.

Do you have the Advanced Display Panel on your machine.? If you have is it showing any codes, Active or otherwise.?

 

[Micah 1989]

I have the advanced display. I do not have any active codes. I have some logged codes but they were there when I got the machine. None of them are electrical or fuel related. Is the transfer pump only supposed to run prior to starting. If it shuts off after starting does the fuel flow through the transfer pump freely? Is the HP pump doing all the suction and supply to the rail?

 

[Nige]

Is the transfer pump only supposed to run prior to starting. If it shuts off after starting does the fuel flow through the transfer pump freely?

The electric pump is the priming pump, not the transfer pump. Its only purpose is to prefill the fuel filter after maintenance
The feed (aka transfer) pump is part of the HP fuel pump and sucks the fuel through the lines, priming pump, and filter. Its function is explained in a bit more detail in the attachment I posted above.

It might pay you to read these threads. A broken non-serviceable spring in the SCV caused an HP pump not to work.

https://www.heavyequipmentforums.com/threads/cat299d2-hp-fuel-pump-change.113054/

https://www.heavyequipmentforums.com/threads/anyone-replaced-hp-fuel-pump-on-cat299d2.112843/

 

[Micah 1989]

I have read the document you attached. I have not been able to make full sense of the fact that there is a feed pump and a high pressure pump. Are they both ran off the same shaft mechanically? When I turned the key on I am hearing a small whine and the SCV is giving me 4.5 to 5 volts on the brown wire and .5 on the orange. This seems to run the same amount of time as the priming pump. When the whine stops both terminals drop to zero. After it shuts off I hear fuel dribbling into the tank from the HPFP return. I'm getting 2.1 ohms back probing across both terminals of SCV. The fuel rail pressure sensor signal wire is 1V with key on and when it cranks it goes up to 2v. Today as I was troubleshooting I would try to start it every now and then. It would do the normal fire then die after one second. This particular time I tried and it fired right up and ran perfectly. After 10 seconds it increased RPM and threw a code. I forgot to bring the code with me but it was along the lines of increasing RPM due to low voltage. Not long after this it started what felt like starving for fuel and then died. After this initial run it would idle for longer than it had been but it ran rough then died and it would not idle up. This is an odd observation but all this started after it had been really hot and then we had a colder night and a cooler following day and this all happened within the first hour of running that following day. It started today at the hottest time of day and my water temperature reading was the hottest it had been today.

 

[Nige]

This particular time I tried and it fired right up and ran perfectly. After 10 seconds it increased RPM and threw a code. I forgot to bring the code with me but it was along the lines of increasing RPM due to low voltage.

Let's get this one out of the way first. This is a temporary Code that is never logged in the ECM memory, it's only Active so long as the condition exists. If system voltage is judged "too low" after startup by the engine ECM it commands an increase in the RPM to aid the charging system. As soon as the low voltage condition goes away the Code disappears.

I have not been able to make full sense of the fact that there is a feed pump and a high pressure pump. Are they both ran off the same shaft mechanically?

Yes they are. This video may clear it up for you. The feed pump is a lobe-style pump simply to transfer the fuel to the HP Supply pump which is a piston pump