Little back story had the truck for 2 years would start it and move it occasionally nothing much. Finally get the project done and road worthy ran great out to the job then started to get a little miss. Finish drive back to the shop down a cylinder and runs terrible. Check and change the fuel filter it was bad everything that came out was rust colored. Didn't get any better. I've cleaned the fuel lines out to no avail. Any guesses? Dirty injection pump? Clog up an injector ? truck idles great but anything over and it rough. Not making any smoke of any color. I have ordered the 2 head fuel filter assembly so will get that installed when it comes in.
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NHC 250 questions
- Thread starter Landman87
- Start date
- 7,390
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- 113
- Location
- Interlachen Fl.
Well there is a cleanable screen filter in the PT. There is a screen filter on the in coming injector ports. Most of the time if one of the 250 I was running poor I had the PT rebuilt. Also checking all rubber fuel lines and if I remember pick up tube can have problems. If you had a gage that you hook to the PT you could check to see if it is getting the correct rail pressure.
Last edited:
- 7,390
- 2,437
- 113
- Location
- Interlachen Fl.
If I remember the 939 series had a check valve installed in the return line that needs to work . Is your truck 809 or 939 series?
It is a 927a1
Pull the injectors or are the screens accessible without pulling?
Gotta pull em.
Might be a good week for it we are scheduled to get rain most of the week. Is there a break down of the screen in the pump?
Crf450x
Well-known member
- 275
- 347
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- Location
- Fall Branch, TN
On top of the pump you’ll see a ~1” diameter plug with a slot all the way across it. The filter/screen is right under there