If you are stubbln, rough running, check this - Ford Powerstroke Diesel Forum
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Old 10-12-2007, 06:50 PM
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If you are stubbln, rough running, check this

After $800 dollars and a bald spot from scratching my head I finally figured out why my 99 f350 was stubblin and running rough. This all started back in August and I just got it all fixed today. I would be driving along and then the back injectors would start starving of fuel. Soon the whole engine would barely run. I would let it sit for a while then it may run 5 miles or 45 miles. No codes were ever stored so this didn't help. I replaced the CPR, still no love. The computer scan showed the passenger side wiring harness was bad , so it was replaced, still no love. The mechanic listened to the fuel pump and said it sounded bad. We replaced it and it ran great for 45 miles then started stubblin and starvin. It took 5 hours to go 90 miles. So I decided to take off the fuel tank and investigate. Dropped the tank(make sure you get the proper tools for the fuel line, it's worth it.) I took out the float and fuel intake assembly and everything looked fine except for a small hole in a rubber hose but this wouldn't cause big problems. I replaced the hose and then decided to take apart the mixing chamber. Inside is 2 small cylindrical screen filters. They were packed with crud . I would say they were 90% plugged up. I sprayed them clean with brake cleaner and cleaned the inside of the mixing chamber also. Put it back together and off to the races we went. the truck sounds better. It runs smoother and boy does it like the fuel now. My mechanic had never heard of this so I decided to put the word out that this may help someone, especially if you are out of money and ideas like I was. I will say that the best option while you have this all apart is to modify the pick up liine and get rid of the mixing chamber and put an aftermarket fuel filter on the frame rail before the fuel pump.. Good luck to all . the Ford was saved from euthinization again......M
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Old 10-12-2007, 06:52 PM
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This should be in the 99-03 board, but someone will benefit.
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Old 10-12-2007, 07:06 PM
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Glad you got it fixed bud! That would be frustrating! I plan on doing the fuel tank and extra filter mods soon!
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