7.3 feels like a miss but not according to AE - Ford Powerstroke Diesel Forum
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Old 05-31-2013, 10:47 AM
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Question 7.3 feels like a miss but not according to AE

Hi

As the title indicates, AE can show no signs of a misfire however seat of the pants feels somewhat differently in the experience.

I have noticed that this only occurs when the fuel is below 3/4 level and disappears with a fuel fill.

My theory is that the fuel pickup is somehow cracked or breached and air si entering the fuel stream until additional fuel is introduced.

Is there any others with similar experiences?

I imagine a new fuel pickup is in order...?
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Old 05-31-2013, 07:28 PM
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Going though the exact same thing with mine right now. Tonight was the second time in 2 weeks it came home on a tow truck. The problem you are having is very common with these truck. There is a part on the bottom of the fuel sending unit in the tank that will break off over time. When it breaks off you will start sucking air with 1/4 tank of fuel remaining. That is what happened to me 2 weeks ago. So I got it home and put 10 gallons of diesel in it and clear the air out of the fuel lines and it fired right back up. I haven't gotten it fixed yet and figured that I would just keep it above half a tank and I would be all good. Tonight I got stranded on the side of the road again although with a full tank of fuel. There are also 2 pre-filters in the fuel sending unit that I think are most likely clogged up also causing my problems now.

Has anyone else experienced this? If so should I be worried about my fuel pump since it has obviously been straining a lot lately from these issues?

BTY... you don't have to replace the whole fuel sending unit. Just the part on the bottom of it and clean the filters in the unit when you replace it. I am going to dealer to get to part tomorrow. I will let you know the part number and cost when I get it.
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Old 06-01-2013, 07:28 AM
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hi mine is similar except the fun begins at 3/4 full. re fill the tank with 7 gals or so and all is well.
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Old 06-04-2013, 04:03 PM
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Hi I made a 200 mile trip today and as it appears, I was wrong about the fuel level. All day, it never hic-cupped once at idle regardless of the fuel level. Upon arrival home tonight as I was maneuvering it into its berth, I felt it start. The misses aren't horrible...just a series of hic-cupps. I wonder if the grey cam position sensor could be an issue here?
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Old 06-04-2013, 04:48 PM
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mine does the same thing. the tach doesn't move but i can feel it. no pattern as far as time of day, temp., fuel level, etc.
let me know what you find.
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Old 06-04-2013, 07:17 PM
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Hi I am looking into the bluish cp sensor from IH. I haven't heard anything much about them in recent years but there may be something there as I recall certain cp sensors were blamed for idle quality issues a few years back.
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Old 06-05-2013, 03:36 AM
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Mine ended up being the fuel pump.
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