Thoughts on possible causes
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Tuned
Joined: Sep 2020
Posts: 267
Likes: 79
From: San Antonio
Thoughts on possible causes
Hello all,
My brother has a 2000 F-350 with the 7.3l diesel engine in it and he can't figure out what's wrong. Says it cranks but won't start, fuel pump not working, no wait to start light and OBD not connecting. Anyone have ideas on where to start looking for causes?
I would normally drive to where he's at (about 45 miles away) but since my eye surgery, I can't drive for a while. I'd like to pass along some information to give him a hand getting it running again. Truck has over 200,000 miles on it with no major issues yet. He'd like to keep it for hauling his RV.
Any help would be appreciated.
Thanks
My brother has a 2000 F-350 with the 7.3l diesel engine in it and he can't figure out what's wrong. Says it cranks but won't start, fuel pump not working, no wait to start light and OBD not connecting. Anyone have ideas on where to start looking for causes?
I would normally drive to where he's at (about 45 miles away) but since my eye surgery, I can't drive for a while. I'd like to pass along some information to give him a hand getting it running again. Truck has over 200,000 miles on it with no major issues yet. He'd like to keep it for hauling his RV.
Any help would be appreciated.
Thanks
Lead Driver
Joined: Jun 2006
Posts: 5,689
Likes: 1,007
From: Near Yosemite CA
Start checking for blown fuses... not a diesel, but my '00 Ex kept blowing fuse #30, no OBD conx, crank, no start, found a short with ground strap and coil #4, have him check fuse #30 in his owners manual and see what it powers, I'm guessing something shorted, is shorted...
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
No WTS... No PCM.... Never going to fire.
Get and learn to use FORScan for codes and monitoring... almost every system out there will not talk to the 7.3 regardless of name or cost.
Disconnect the fuel bowl heater then prove the fuse as it shares it with the PCM.
And because fail to start is usually a crank until ticked event... Charge the batteries back up or it will also keep it from starting due to excessive voltage drop.
EDIT.....
Also because of no PCM, you will never pull any codes as nothing is there to read.
Get and learn to use FORScan for codes and monitoring... almost every system out there will not talk to the 7.3 regardless of name or cost.
Disconnect the fuel bowl heater then prove the fuse as it shares it with the PCM.
And because fail to start is usually a crank until ticked event... Charge the batteries back up or it will also keep it from starting due to excessive voltage drop.
EDIT.....
Also because of no PCM, you will never pull any codes as nothing is there to read.
Last edited by Jimmy's Pilot Service; Oct 30, 2025 at 01:59 AM.
2nd Gear
Joined: Sep 2025
Posts: 2
Likes: 1
Won't start 7.3, I've owned three.
Hello all,
My brother has a 2000 F-350 with the 7.3l diesel engine in it and he can't figure out what's wrong. Says it cranks but won't start, fuel pump not working, no wait to start light and OBD not connecting. Anyone have ideas on where to start looking for causes?
I would normally drive to where he's at (about 45 miles away) but since my eye surgery, I can't drive for a while. I'd like to pass along some information to give him a hand getting it running again. Truck has over 200,000 miles on it with no major issues yet. He'd like to keep it for hauling his RV.
Any help would be appreciated.
Thanks
My brother has a 2000 F-350 with the 7.3l diesel engine in it and he can't figure out what's wrong. Says it cranks but won't start, fuel pump not working, no wait to start light and OBD not connecting. Anyone have ideas on where to start looking for causes?
I would normally drive to where he's at (about 45 miles away) but since my eye surgery, I can't drive for a while. I'd like to pass along some information to give him a hand getting it running again. Truck has over 200,000 miles on it with no major issues yet. He'd like to keep it for hauling his RV.
Any help would be appreciated.
Thanks
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
I've owned 3. My best thought based on experience, cam position sensor. Every 7.3 owner should carry a spare in their glove box. Bad sensor will let it spin forever, but not start. No codes. As I recall, you need a 10mm socket, 6" extension, and ratchet. I'd look for a fuse as someone suggested, (that's easy enough) and then try the camshaft position sensor. Let us know how it works out.
Thread Starter
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Tuned
Joined: Sep 2020
Posts: 267
Likes: 79
From: San Antonio
I appreciate all of ya'lls thoughts on this. I've passed the information and a link this thread on to him so he can start looking into getting it back up and running. Please keep the thoughts coming.
Keith
Keith
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