Got my truck up to 75mph and it started lurching a bit and sounded like someone continuing to push down on the gas - a guy looked at it said I had water in the fuel tank -put new filter in and seafoam -got it back running fine -hooked my horse trailer up to it...got up to 55mph and it started again and died on me! He put in a new fuel pump -ran it home 65mph just fine -hooked up to trailer again today and acted worse then before died on me again! It starts great everytime and runs - anybody know what's going on??? Please HELP!!!

 

When did you last change the fuel filter?

 

fuel filter was last changed Aug or Sept of last year

 

Don't forget to look at the fuel heater screen also. A good system write up below...

http://www.cumminsforum.com/forum/94...m-writeup.html

 

If possible thread in a hose and put a pressure gage on the injection pump. There is a plug on the side of the main body to check fuel pressure. 30-35 is expected.

If the engine starts well afrter sitting and starts normal without whithe smoke then this problem is most likely a fuel restricting problem and not an air leak.

However, if the engine has extended cranking to start or has a smell of diesel fuel around it then the original rubber return lines and original fuel heater assembly then they should all be changed out as a matter of maintenance, every 10 - 15 years, maybe less. There are a ton of clamps, hoses and connections and all of them can be problems from the steel lines on the frame to every point on the engine. Even the steel lines can go bad in Northern cliamates with winter salt on the roads. It is such a hassle to service all of these lines that it might be best to just du it all at once because of age. One goes then the next, etc. I did all mine at once when my transmission and starter were out which made access better.

 

Thank you so much for information -I will check that out!

 

http://www.cumminsforum.com/forum/94...-12-valve.html

 

Check the pick up in the fuel tank often over looked filter sceen that will cause lack of power and fuel flow problems.

 

thank you!!