Cat 299d3 fuel issue Help

[gene2000]

Hello
I have the Cat 299d3 and it’s not getting fuel to the injectors. I have a few questions I need answered.

1. How many volts should be at the connector for the injector fuel pump to open and close? I have good fuel going into the injector pump but nothing is coming out when I crank the motor.

If I spray starter fluid it will fired up.

2. Is there a way to straight wire the injector pump to see if it will open to let fuel go to the injectors?

3. Is there a way to test the injector pump?

All fuses are good…

Thanks for any help.

 

[gene2000]

Serial number: DY900770

 

[Nige]

The best way to answer all your questions above is that you need Cat ET hooked up to the machine in order to monitor fuel rail pressure. The way the electronics work is that the ECM calculates a "desired rail pressure". When cranking if the actual RP does not reach or exceed the desired RP the ECM will not energize the fuel injectors.

Basically the power to the injector pump is in the form of the pulsed waveform that requires an oscilloscope to monitor it. Hence the recommendation to get ET hooked up and see what the rail pressure does while cranking.

Do you have any more back story to the issue.? Did the machine misbehave for a while until it quite completely, or was it running and just stopped dead like the key was turned off, or was it shut off one night and would not fire up the next morning.?

Another question. Do you have any way of reading codes on the machine Monitor Panel.? If you are not sure post a photo of the panel in the upper RH corner of the cab.

 

[gene2000]

Thank You for a reply!!!

I send the ecm to a repair company to check it out. I have a new harness. I need to no how to test the injection fuel pump? How many volts should be coming through harness and how to test the plunger on the pump?

Fuel is there but the pump is not letting fuel out the get to the fuel rail and injectors.

I had caterpillar tech come out, he said I need a new harness and ecm…….

I think it’s a broken wire, pin 54 and 74 both come together to the pump. When I test for cunuity just one wire test good with the multi meter.

Any suggestions?

 

[gene2000]

Codes I’m receiving 1239-1 ,157-3

 

[Nige]

How many volts should be coming through harness

Do you have an oscilloscope.? See my earlier reply.
"Basically the power to the injector pump is in the form of the pulsed waveform that requires an oscilloscope to monitor it."

I think it’s a broken wire, pin 54 and 74 both come together to the pump. When I test for cunuity just one wire test good with the multi meter.

I would suggest not to use a multimeter to test for continuity. Instead do this.......

1. Unplug the connectors at both ends of any given wire that you want to test.
2. Use a jumper to connect one end of a specific wire to machine frame ground.
3. Connect batt+ voltage to the other end of the same wire via a fused 5A test light. If the wire will pass 5A without going pop you can call it good.

There have been numerous instances on this forum where a damaged wire would show good on a continuity test but was not capable of passing the load it required in order to function.

I send the ecm to a repair company to check it out.

Good luck with that. If there is a problem with it then all anecdotal information indicates that they are not repairable.

Codes I’m receiving 1239-1 ,157-3

It would have been good if you had started with these.

157-3 relates to the fuel rail pressure sensor, specifically "voltage above normal" which refers to the signal wire from the sensor. See the attachment for a testing procedure. I suggest that you start with this code first as it could be the clue to everything else.

1239-1 relates to excessive fuel leakage in the FIP. Put that on the back burner for now.

 

[gene2000]

Thank You, I will do some research and let you no the result.

Thanks