99 7.3 HARD start, runs ok 15 seconds then starves for fuel and dies! - Ford Powerstroke Diesel Forum
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Old 05-05-2014, 01:25 PM
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99 7.3 HARD start, runs ok 15 seconds then starves for fuel and dies!

First and foremost, I'm new to posting here but have used this forum to keep my truck running since we bought it. We've been throwing everything at this truck for 6 weeks and were stumped.

So, details. 99 7.3 F350 4x4 225k or so. 8 weeks ago we were driving along and she starts running rough...like 4 cylinders, buckin' and Kickin' rough. 3 miles into our limp home and voila....she pulls out of it and runs just fine. 2 days later, same thing. A week later, she starts not it and never stops. Limped her home and started trying to figure out what's wrong. Now she starts Hard, runs ok for 10-15 seconds a d then starts loping ugly like, starves and dies. So far she's got

One new #7 injector
2 new valve cover gaskets
Icp
Ipr
Fresh oil change
New fuel filter
Dropped the tank and cleaned the socks
(Girlfriend has tried begging and pleading with it to no avail)

So...what's next?
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Old 05-05-2014, 01:35 PM
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Also more 270k on the clock
4" turbo back exhaust
Sct tune
Tried the CPS, didn't help
Swapped computers, didnt help
Maintains good fuel pressure (65-70 psi) at the fuel bowl
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Old 05-06-2014, 02:19 PM
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Do you have a way to monitor your HPOP, if so what is your HPOP pressure,your ipr % and rpm when trying to start?
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Old 05-07-2014, 07:14 PM
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***SOLVED***

Boy we were stumped but it turned out to be injector o rings! Swapped them out and she started right up and runs like the beast she is. We were getting ready to just buy the hpop but new o rings were 70 vs 450+... I'm glad we tried that first! Thanks guys!!
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Old 05-07-2014, 09:03 PM
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There was some air in the fuel bowl, and air bubbles would come up if you opened it right after it died. Apperantly air would be forced back through the bad O ring into the fuel, where it would fill the top of the fuel bowl, until it choked out and died. #8 was missing the copper o ring on the nozzle, and the first O ring was shot. Runs much quieter, and smoother now.
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