Surgeing and ticking

[nfox]

I've have a 96 CTD 5-speed and just started having this problem, It will run fine until it gets warmed up and going down the road it starts to surge and run wild, and when you come up to a stop sign it will die. It will make a ticking or clicking noise when it starts to act up. When it dies it will start right back up and if you step on the pedal it will rev to 3400rpm instantly and slowly dies. The first time it happened i just made it home and i changed the fuel filter and it ran fine for 3 weeks. Drove it 1000 miles with no problem. Today on the way home from work it started all over again. Do you guys think it could be the fuel filter again, a bad pickup tube in the tank, or the rubber return line, or the rubber elbow line on the lift pump, or a bad lift pump? I buy my fuel from the same place all of the time. I always add some power service with cetane booster at every fill up. Is there any way to install a fuel pressure gauge to check it? I really like all of the great responses!!!!

 

[nfox]

pump fixed

I got my pump fixed it had the 2 o-rings on the #6 plunger was letting oil seep by and swell up the o-ring and make the plunger sticky when the engine got to operating temp. Oo. Oo.

 

[Don M]

Re: pump fixed

Originally posted by nfox

I got my pump fixed it had the 2 o-rings on the #6 plunger was letting oil seep by and swell up the o-ring and make the plunger sticky when the engine got to operating temp. Oo. Oo.

Can you go more into detail on what you are saying?



Don~

 

[nfox]

o-rings on plunger

With age the orings on the plunger will swell up and one oring rides in fuel and the other oring rides in engine oil. The diesel tech at injection technology showed me a little demonstration and took a barrel and plunger assymbly and touched the plunger with his fingers and left it set for ten seconds and then tried to push the plunger through the barrel and it would not go. Thats just with a finger print on the plunger. Then he wiped it off and dipped in some diesel fuel and it would fall through the barrel. When engine oil gets behind the lower oring it swells it out and then the plunger will not go in the barrel and causing the engine to die at idle and when i would touch the throttle it would run wild. The diesel shop said they have redone a bunch of these p-7100 pumps. Here's there phone number if you have any questions ask for dennis 1-641-324-2010. Great bunch of guys!!! Oo. Oo.

 

[Don M]

Re: o-rings on plunger

Originally posted by nfox

With age the orings on the plunger will swell up and one oring rides in fuel and the other oring rides in engine oil. The diesel tech at injection technology showed me a little demonstration and took a barrel and plunger assymbly and touched the plunger with his fingers and left it set for ten seconds and then tried to push the plunger through the barrel and it would not go. Thats just with a finger print on the plunger. Then he wiped it off and dipped in some diesel fuel and it would fall through the barrel. When engine oil gets behind the lower oring it swells it out and then the plunger will not go in the barrel and causing the engine to die at idle and when i would touch the throttle it would run wild. The diesel shop said they have redone a bunch of these p-7100 pumps. Here's there phone number if you have any questions ask for dennis 1-641-324-2010. Great bunch of guys!!! Oo. Oo.

I dont know what the guy was trying to tell you, but there are no o-rings on the plunger at all. The pump plunger has been so finely lapped to its companion barrel that it will seal even at low speeds and high injection pressures.

There is a leakage return duct on the plunger itself, but no -o-ring.

More than likely the return duct is what he was talking about and one or more of your plunger/barrel assemblies needed to be replaced.



Don~



edit- after thinking about this some more I bet he was talking about the o-rings that are on the outside of the barrel. they seal the oil and fuel areas.