HELP! 2003 F250 SD 7.3 manual 6spd no power after 20 minutes driving - Page 3 - Diesel Forum - TheDieselStop.com
'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.

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post #31 of 37 (permalink) Old 03-31-2019, 04:36 AM Thread Starter
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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
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post #32 of 37 (permalink) Old 03-31-2019, 06:55 PM
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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...

'02 7.3L 6spd Manual, 2WD

Air Springs, Exhaust Brake, HPX, 110 Gallon auxiliary fuel tank
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post #33 of 37 (permalink) Old 03-31-2019, 10:27 PM
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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.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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Last edited by klhansen; 03-31-2019 at 10:35 PM.
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post #34 of 37 (permalink) Old 04-01-2019, 12:13 AM Thread Starter
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hey Kevin , i think i understand now.

Even though it's a new pump it could still be not getting power correct?
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post #35 of 37 (permalink) Old 04-01-2019, 07:24 PM
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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.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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post #36 of 37 (permalink) Old 04-02-2019, 08:40 AM Thread Starter
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hey Kevin, Thanks so much! At the moment plan to update tomorrow on where we are.
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post #37 of 37 (permalink) Old 04-30-2019, 10:14 PM Thread Starter
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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!
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Last edited by saltypop; 04-30-2019 at 10:15 PM. Reason: need to add more
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