7.3 died out on me - Ford Powerstroke Diesel Forum
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Old 07-23-2012, 05:13 AM
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7.3 died out on me

I was one my way home last night, I stopped at a stop sign and could feel it bucking a lot, like a REALLY rough idle. I got about 300 or so more feet and the truck died out, almost like it ran out of fuel. I cant get it to fire back up, and it kind of sounds like it is skipping when i try to turn it over. It still has fuel in the bowl, I opened the relief valve and it pissed out diesel. Its stuck sitting in a buddys driveway right now and I'm lost as to what it could be. I havent had any CEL come on.
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Old 07-23-2012, 05:20 AM
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Well, take off the chip to begin with. Always start there.
Turning the key on, I'm assuming the WTS light comes on.
With the key on and fuel filter out, does the bowl fill up? That means the pump is on.
It could be a CPS. I'd swap it for a new one or a known good one.
After that, crank for a while then pull the HPOP reservoir plug. See if it has oil in it, fairly close to the top.

Could also be the UVCH coming loose or chaffing a hole in the wire insulation. I'd check them, pretty quick to check the connection.
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Old 07-23-2012, 05:33 AM
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but a CPS would usually throw a code wouldnt it?
when it died it was acting like it ran out of fuel
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Old 07-23-2012, 06:44 AM
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In most cases, a bad CPS will start working again after a 20min "cool-off".

Are you under 1/4 tank?

You need to make sure the pump is running. For @15sec after you first roll the key to "on" you should feel or hear the electric pump (on the frame rail, kinda below where the drivers seat is, under the truck) running.

You need to answer the WTS question...
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Old 07-23-2012, 06:56 AM
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Wts light works. Fuel pump runsi just got it to fire up so I'm assuming its the cps.

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Old 07-24-2012, 06:59 AM
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And after it just died on me again I'm back to second guessing myself. Has a new cps in it, and it died the exactly same way, working on pulling the codes as soon as I get my hands on my code reader.

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Old 07-24-2012, 07:00 AM
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Oh, and yes I'm right around the 1/4 tank mark

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Old 07-24-2012, 07:42 AM
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There can be an issue with the fuel pick-up in the tank. There's a whole contraption in there (mixing chambers and screens). If the plastic in there cracks or dislodges you suck air instead of fuel and it happens right around 1/4 tank. The test is pretty easy though, just pour in 10gallons and see if the problem resolves itself (you first though it seemed like fuel starvation) Have a look at this page for a good mod and what stuff looks like -> Welcome to guzzle's In-tank Hutch Mod Web Page

Do you have the right kind of code reader? A generic OBD-II scanner is of little use on our engines Try adding fuel, couldn't hurt, you'd be buying some anyway - right?
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