7.3 died while driving
Logistics Pro
Joined: Oct 2011
Posts: 3,953
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From: Mcdonough, GA
There isn't any pump in the tank on these. Just the one under the drivers seat in the frame rail. Comes on for about 15 secs give or take when you turn the key on then shut off if you dont crank the truck. IPR is just below the fuel bowl on drivers side. Looking for a pic now
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
Also while you looking at things check the wire harness at the square 42 pin connector were it crosses the driver side valve cover. Many have found worn through wires. see pics. Not sure if it will cause a complete cut out but could depending on which wire is rubbed through
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New User
Joined: Apr 2016
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7.3 died while driving
Ok I looked at the wiring going to the ipr and it looks ok. The tin nut on the end is tight. When I grab the wiring harness for the ipr I can wiggle the sensor inside the housing. Is that normal? Is 15 seconds a normal amount of time for the fuel bowl to be filled? There is a line going from the bottom of the fuel bowl on the passenger side that runs behind the passenger valve cover. In the back it is covered in oil. Is that a high pressure oil line or fuel line?
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7.3 died while driving
Ok, mam this is a really crazy problem. Everything has checked out good. Can I check oil and fuel pressure with the conventional guages? I don't know what else it could be. It couldn't be an issue with the ignition switch could it?
Lead Driver
Joined: Jun 2004
Posts: 6,316
Likes: 582
From: Amarillo, TEXAS!
I'm leaning toward a thermal intermittent problem with the IPR coil, myself. Could be other things, but the symptoms are in line with it. That's why I suggested hooking up a CFR and capturing it when it happens. If that's it, it should be pretty obvious in the ICP and IPR data. Another thing you could try in the meantime is drive it until it dies, then cool the IPR coil with some ice water. If it restarts immediately, that's most likely the issue.
You can check fuel pressure with a mechanical gauge, but it requires a -4 ORB adapter for the fittings on the filter housing. Or there's an 1/8" NPT port on each head, but they're kind of a a pain to get to.
You can check fuel pressure with a mechanical gauge, but it requires a -4 ORB adapter for the fittings on the filter housing. Or there's an 1/8" NPT port on each head, but they're kind of a a pain to get to.
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Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
I'm leaning toward a thermal intermittent problem with the IPR coil, myself. Could be other things, but the symptoms are in line with it. That's why I suggested hooking up a CFR and capturing it when it happens. If that's it, it should be pretty obvious in the ICP and IPR data. Another thing you could try in the meantime is drive it until it dies, then cool the IPR coil with some ice water. If it restarts immediately, that's most likely the issue.
You can check fuel pressure with a mechanical gauge, but it requires a -4 ORB adapter for the fittings on the filter housing. Or there's an 1/8" NPT port on each head, but they're kind of a a pain to get to.
You can check fuel pressure with a mechanical gauge, but it requires a -4 ORB adapter for the fittings on the filter housing. Or there's an 1/8" NPT port on each head, but they're kind of a a pain to get to.
Larry
Lead Driver
Joined: Jun 2004
Posts: 6,316
Likes: 582
From: Amarillo, TEXAS!
Passenger side wheel well has a drain pipe (3/8" od) Connect a rubber tube to this and to a fuel pressure gauge. Open fuel filter drain valve on back side of filter. Start truck. Tape or tie the gauge to the radio antenna so you can watch fuel pressure while driving.
Larry
Larry
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