looking at buyinga 89 3500 cummins,has 136k on it. mint shape one owner.runs great but he says it is getting fuel in the oil. what do u think the prob is? smokin deal,dont want to miss but dont what a big problame either. any help/advice? thanks guys

 

I would look to the injection pump when they leak it gets in the oil

 

odin. do you think the pump needs rebuilt? or a seal or sumthing simple?

 

I,d go for a rebuild

 

It could a bad lift pump leaking fuel into the oil or it could be the seal at the front of the injection pump leaking. If you look online you can find the lift pump for ~$50.

The injection pump seal requires pulling the pump (I've never done it, but I don't think it would be too hard) to replace. My injection pump went at about 170,000 miles, but many seem to last far longer than that.

 

I second the lift pump idea. When the diaphragm goes bad/tears it will cause the pump to leak fuel into the crank case. That's what mine did...started making oil. New LP is like $80 from Napa...and that's on the high side. They can be found cheaper.

 

i had this problem with my truck and the front seal of he injection pump went out. Pull the pump replace the seal pump put pump bakc on. i took it to a pump shop and the charged me 20 bucks to do,with me pullin the pump,it and it toook about 5-10 mins. BUt i have also heard ip the lift pump doing the same thing.

 

thanks for the help guys,anything else i sould keep an eye out 4 on this thing? going to get it and try the lift pump first.

 

Just the normal 1stGen stuff that you would expect to possibly go wrong in a 18year old truck- front end, lights/ electrical, body.

Daniel

 

Thanx 4 All The Advice Guys Its Been Great!