Cat 2017 259d loses power and is sluggish

[Nige]

Well, now I’m taking the fuse block off to change a stud that I broke off, and trying to get the stripped Phillips head out of the front of the fuse block…. Not a good day

I understand your frustration but the problems you mention you have to fix are probably also as a result of corrosion.

 

[Cgray]

Got the fuse block back together and still no power to the fuel priming pump

 

[Nige]

Have you now got full (battery voltage) power to both halves of the fuse panel.?
Have you charged/replaced the battery.?

 

[Cgray]

It’s still sketchy at the fuses, battery is good

 

[Cgray]

I’m only getting 6 or so volts to some of the fuses

 

[Nige]

It’s still sketchy at the fuses, battery is good

Good as in what voltage exactly.?

Back again to that word that no-one shall utter - corrosion….

How far from away the battery do you have to go to see a voltage on your meter that is more than 0.1v below what you measure across the battery terminals.?

 

[heymccall]

I has to wonder, where are you grounding your multimeter when voltage testing?

However you have to rig it, the multimeter ground needs to be on the battery negative. If that then shows good voltage at the fuse panel, then R&R the ground strap at the back of the cab, making sure all contact surfaces are clean from corrosion.

 

[Cgray]

I’m touching the red pin at the priming pump and the black(ground) to the battery and no power.

 

[Cgray]

I has to wonder, where are you grounding your multimeter when voltage testing?

However you have to rig it, the multimeter ground needs to be on the battery negative. If that then shows good voltage at the fuse panel, then R&R the ground strap at the back of the cab, making sure all contact surfaces are clean from corrosion.

I’m not getting good voltage to the fuse block

 

[heymccall]

No argument over fuel pump not having power.
The grounding the meter to the battery negative was in regards to the low voltage at the fuse panel.

 

[Cgray]

No argument over fuel pump not having power.
The grounding the meter to the battery negative was in regards to the low voltage at the fuse panel.

11.76 v at the battery terminals, behind the cab on the fuse block studs, reading 11.5 when key is on, (ground is attached to the battery ground). Also the 3 studs below the fuse block reading 11.7 same as battery

 

[heymccall]

Amuse me...leave lap bar up, and turn to CRANK and then release to RUN.

Does the pump now come on?

 

[Cgray]

No

 

[Cgray]

Amuse me...leave lap bar up, and turn to CRANK and then release to RUN.

Does the pump now come on?

No

 

[Cgray]

found the problem, the pin that plugs into the back of the fuse block to accept the fuse leg in the front, needed to be spread open to put more pressure on the fuse leg

 

[Nige]

So all good now or are you still having the intermittent low power issues.?

 

[Cgray]

So all good now or are you still having the intermittent low power issues.?

Not sure, going to run it a lil tomorrow and see.

 

[Cgray]

So all good now or are you still having the intermittent low power issues.?

Still running sluggish after about 20-30 minutes

 

[Nige]

Back to fuel system then. To start with.........
Have you replaced the screen in #7.?
416-5884 is the Part Number.

See this thread for in-depth diagnostics - https://www.heavyequipmentforums.com/threads/cat-279d-fuel-problems.97492/

 

[Cgray]

Yes, it’s new, it came with the new priming pump. It primes fine and filled the water separator as it should have