I have an '05 Excursion w/ 6.0 diesel that is about to drive me nuts. I have been having trouble starting it, so I took it to the dealer (warranty work) who changed the "intake tube" on the high pressure pump. I ran it two days and was left stranded on the side of the road due to the same "no-start" problem. Same dealer now states they have found a "leak" in the same high pressure pump and said the truck is now fixed. I am hesitant to pick it up so not to be left stranded again. Does this sound right to any of you? Or, is the dealer jabbing in the dark?

Seems to me that it just won't start when it is hot. It cranks beautifully - just won't turn over....

 

There is a TSB to install a bracket to support the HPOP so it will not vibrate and lose its seal. See if they did this and you should have no more issues. Same thing happened to me about 3 months ago and no issue since.

 

The dealer is telling you right. The HPOP (high pressure oil pump) oil supply tube is known to have a defect that will cause your crank no start and has an update that I'm sure they installed. If they didn't get it back together right it probably had an INTERNAL leak that you would never see but cause the HPOP to lose pressure. The HPOP is what gives your injectors the necessary oil pressure to fire. I'm sure you'll be OK if they did the repair correctly this time. Just don't let them charge you another deductible as it should have all been fixed at ONE time.

The reason it won't start hot is because the oil is thin and the pump can't build enough pressure to fire the injectors by just turning over with the starter. A running motor is a different story.

 

Awesome gent's... I appreciate the reply. I feel more confident now knowing what the trouble could have been. And, TRUST ME, they won't be charging me anything for this re-repair....

 

throw a bicycle in the back when you pick it up, so at least you won't have to walk if it craps out on you.

 

How about a Yugo at least, then he won't have to peddal.

 

He'd be safer on a bicycle!!!

 

just dont run water/meth and NOS on the yugo , right ?

 

I have 06 F250 4WD, 40,500 miles. The truck runs great but is slow to start. The Ford house says I have an internal oil leak that is causing the injectors to lose fuel pressure after the engine cools off. Ive had it in the shop seven times for this problem and they cannot fix it

Any help would be appreciated.

 

Refer to this drawing to help you with my explanation:http://dan.prxy.org/Truck/6L_bible_h.../Page_045.html

I'm not sure I can simplify this enough to explain to you, but your internal oil leak won't cause you to lose fuel pressure. It will cause you to lose fuel INJECTION pressure, but your motor has to be running to have high pressure oil to inject the fuel into the combustion chamber. There is a fuel feed to every injector that is fed by an electric fuel pump under the cab but it's similar to the water plumbing in your house in that it's under pressure all the time. You turn the key on, even with the motor not running, and you have fuel pressure to feed your injectors as long as the fuel pump is running. It will time out after a point if the motor isn't started. Clear as mud so far?

It takes high pressure oil from the HPOP in this system: http://dan.prxy.org/Truck/6L_bible_h.../Page_041.html
to push the intensifier piston down which forces fuel under extremely high pressure through the injector nozzle and into the combustion chamber.

If you have an internal oil leak in your high pressure oil system it usually affects hot starts, not cold starts, since your oil is thin and the starter usually can't crank fast enough to make enough high pressure oil pressure to inject fuel properly to start the motor. Usually after the motor cools down it might start.

The electric fuel system is NOT that difficult to diagnose. It takes a simple pressure gauge to see if you have a fuel pressure leak in the system. Hook up the gauge, turn the key on and presto--fuel pressure. It should stay for a few seconds until the electric pump automatically shuts off, but it should HOLD.

Do you possibly have a list of what they say they have fixed or replaced, because it's not that hard--a little labor intensive, but not that hard.