7.3 shuts off while driving... - Ford Powerstroke Diesel Forum
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Old 01-18-2009, 11:26 AM
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7.3 shuts off while driving...

I tried the search and found similiar problems but this one is a little different.

1996 F250 7.3 208k miles
only drive the truck 1 to 2 times a week.
starts very fast...but after driving about 5 miles to a job it sat for 4 hours and would not start back.....I tried and tried and nothing. I took the air filter out and it fired right up....so I changed the filter with a new one and put a new fuel filter in at the same time...had no problems for about a week. I have had the truck plugged up for the last few days because of the temps. Uplugged truck a few days ago fired right up, I let it warm up for a while then drove it 70 miles without stopping...shut it down for about 30 minutes...then started right back up and headed home truck lost power and shut down after less than a mile. would not start. tried many times..tried the air filter thing again still no start....called tow truck...after waiting about 30 minutes (trying to start it every 5 minutes or so) I kicked it and cussed it real good...and it fired right up....drove 70 miles back home with no problems....any ideas? This is my first diesel I pull a concrete trailer for a weekend business need it fixed pronto....oh also noticed a small fuel leak from somewhere it pools up on the frame near the pass. side door. related?

ps. This has happend twice going down the interstate, I would put it in nuetral and it would refire.......this happened before all this other^^^^^

Thanks for your time....sorry for length of post
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Old 01-18-2009, 11:29 AM
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Sounds like an intermittent CPS problem.
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Old 01-18-2009, 11:31 AM
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As far as the fuel goes, can you see where it is coming from?
Are you sure it's diesel?

I don't think there are any fuel lines on that side of the truck.
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Old 01-18-2009, 11:33 AM
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What is cps?

I'm pretty sure it is fuel....smells like it and looks like it..... I can't tell where its going from....its collects on control arm and drips from there...
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Old 01-18-2009, 11:39 AM
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ah ...looked it up cam sensor....I thought either it worked or it didn't? easy install? and other options it could be?
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Old 01-18-2009, 12:06 PM
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Yes easy install. 5 minutes. it's on the front by the flywheel at about 10 o'clock. Unplug cam sensor on truck, remove 10mm(i think) bolt, remove old CPS, Install new one, intall 10mm bolt, plug in, done.

And yes they can cause a very intermittent problem.
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Old 01-18-2009, 12:17 PM
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Quote:
Originally Posted by Southpaw View Post
Yes easy install. 5 minutes. it's on the front by the flywheel at about 10 o'clock. Unplug cam sensor on truck, remove 10mm(i think) bolt, remove old CPS, Install new one, intall 10mm bolt, plug in, done.

And yes they can cause a very intermittent problem.
ok...will do tomorrow....any clue on the fuel? could it be something else? does this engine have any other filters that I don't know about....I have changed the one on top of engine (paper one with black top, screw in) and oil filter....thanks -John
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Old 01-18-2009, 12:28 PM
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I don't know man.
Need a little more info. I would let it run, and try to trace the leak. That's really all you can do to find the source of the leak.
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Old 01-18-2009, 12:33 PM
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thanks......
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Old 01-18-2009, 02:57 PM
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For the fuel leak problem I would take the plaqstic cover off of the motor 3 nuts. When you got that off take a light and look under the turbo and see if there is any fuel laying on top of the intake. Sometime the lift pump will shoot a little stream out of it when it goes bad, or there is a big bolt under the turbo that has 2 steel lines going to each side side of the motor. Where the bolt goes through the steel lines, the lines start leaking their.
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