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'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

Thread: HELP! 2003 F250 SD 7.3 manual 6spd no power after 20 minutes driving Reply to Thread
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  Topic Review (Newest First)
04-30-2019 11:14 PM
saltypop UPDATE: GOING INTO 6 WEEKS CONFIRMED IT WAS INJECTORS. We changed them all out today and truck is running,
now to fix the ac that went out during all of this. RT Thanks for Keeping tabs on me so i didn't get discouraged!
04-02-2019 09:40 AM
saltypop hey Kevin, Thanks so much! At the moment plan to update tomorrow on where we are.
04-01-2019 08:24 PM
klhansen
Quote:
Originally Posted by saltypop View Post
hey Kevin , i think i understand now.

Even though it's a new pump it could still be not getting power correct?
That was my thought. I did notice when looking at the wiring diagram for the wire color, that the PCM does monitor the fuel pump secondary power circuit, but not sure what it does with it at the moment. I may have to dig into that for you.
04-01-2019 01:13 AM
saltypop hey Kevin , i think i understand now.

Even though it's a new pump it could still be not getting power correct?
03-31-2019 11:27 PM
klhansen
Quote:
Originally Posted by saltypop View Post
Hey Kevin, Thanks, is there a how to link somewhere to do this. Planning to change O rings on drivers side after church today to see whether there are any Orings that are bad. Thanks so much,Duane
You'd have to identify the hot wire going to the fuel pump, splice into that and connect your indicator light between that and ground. Should be the pink/black wire at the fuel pump, or you could intercept either wire at the fuel pump cutoff switch on the right side kick panel.
03-31-2019 07:55 PM
Gray02Dually I was thinking along similar lines. I'll bet it's either losing power to the frame-rail mounted pump or it's got a partial clog and can't deliver enough fuel at highway speed. I had a fuel pump get clogged and saw similar symptoms as Saltypop. I could idle it but pulling a load, it would run out of fuel.

My situation was easier to diagnose because I knew that I had probably trashed it from old fuel in an aftermarked auxiliary tank. I have an in-bed 110 gallon that I hadn't used in a while and then put diesel in and tried running on it. Failed almost immediately. I get the impression that they barely supply adequate fuel under load even when new. just my humble opinion...
03-31-2019 05:36 AM
saltypop Hey Kevin, Thanks, is there a how to link somewhere to do this. Planning to change O rings on drivers side after church today to see whether there are any Orings that are bad. Thanks so much,Duane
03-30-2019 11:02 PM
klhansen Wondering if you have an issue with the fuel pump getting power. I don't believe that the PCM monitors the power to the fuel pump. Maybe you could wire an indicator light to the fuel pump connector so you could see if the pump is continuing to get power or is off when your loss of power occurs. Truly a WAG on my part, but can't hurt to check.
03-30-2019 06:14 PM
saltypop UPDATE: RT helped us get the truck back started, MANY THANKS! Air was in the lines, Just got it started an hour ago. Ran long enough to get the air out and blow enough blue smoke to fog the subdivision out and then took it for a spin and after 6/7 minutes it lost power again and shut down.

Sat for 10 minutes and fired up and went straight to the house.

Don't have the right fitting at the moment to do a fuel pressure test but back to square one with loss of power
and shutting down.

here is what all we have done so far:

Dropped tank and changed pickup foot and screens and got all the old pieces out of the tank. sensors changed, Fuel pump changed fresh oil and filters. Monday will make 2 weeks down so trying to get it back going before then.
Also Ran AE for codes and no codes present.

THOUGHTS:
03-29-2019 08:37 PM
saltypop UPDATE: Dropped tank last night and today and changed pickup foot and screens and got all the old pieces out of the tank. Put the 10 gallons back in and cycled key 5 times and it cranked and ran for 2 mins then went to take it for a spin and it bogged down before it moved and cut off. Tried to crank again and batteries are dead now from making attempts. Ran fuel out of bowl to make sure fuel was moving through. Will have to wait until morning once batteries are fully charged to try again. Not sure what else to do. All sensors changed, Fuel pump changed fresh oil and filters. Monday will make 2 weeks down so trying to get it back going before then.
Also Ran AE for codes and no codes present
03-27-2019 05:36 PM
saltypop UPDATE: As of an hour ago because of lack of time and a weak sounding fuel
pump we replaced the fuel pump and drove for 16 minutes again before it began to act up
and made it back to the house. Hopefully tomorrow i am able to drop the tank and do the pickup replacement
as well as screens, which is the plan at this point. Thanks for All the help but please read the entire posts
so you are able to know what happened and where we are at this point. Thanks for All the help
and will update hopefully tomorrow.
03-27-2019 12:39 PM
klhansen @BS Hauler, on the 20 MPH at 2200 rpm thing:
You apparently didn't read all of the thread. See posts #19 & #21 above.
03-27-2019 09:52 AM
BS Hauler Something is not right in what you are reporting for numbers. There is no way you are doing 20 mph in 4 or 5 th gear at 2,200 rpm's. Do you mean 220 rpm's. It sounds like fuel starvation to me. Ether plugged filters in tank or air inclusion into the lines between tank and pump. There is a spot where the fuel line runs over the frame above the tank that rubs on the frame.
03-25-2019 11:07 PM
saltypop Hey Kevin,

Dave RT has suggested it for some time now, hopefully it's the culprit as Dave thought
it from the start. It's blowing blue smoke and very little white so hopefully this is it. With
411k on the clock trying to get to 600 plus
03-25-2019 10:17 PM
klhansen I think you may be on the right track in dropping the tank. White smoke is a sign of fuel starvation.
Hope you find the solution there.
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