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  #1  
Old 08-30-2009, 10:10 AM
cleazy55 cleazy55 is offline
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fuel pump runs for 15 seconds after key turned on, noise under the hood by left batt

Just bought the truck a month ago. A friend of mine test drove the truck but decided not to buy it. It left him on the road. The owner came and got him, relieved the fuel off the filter for just a second and the truck started. I don't think that helped any because the truck has died on me a couple times on the road. If you let it sit for 30 minutes to an hour it will start back up. When you turn the key on, about 3 seconds later there is something making a hum kind of noise beside the left battery. Right now when the truck is cold and you turn the key on the fuel pump will run for about 13-15 seconds before it turns off. The truck will start, it just takes about 1-2 seconds longer to start then it should. I have changed the cam sensor, checked the oil level in the hpop, changed fuel filter, I changed the motor oil right after I bought it.
Is the fuel pump getting weak or the fuel regulator maybe causing this???
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Old 08-30-2009, 10:15 AM
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My bad, the truck is a 2002 7.3 4x4 crew cab.
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  #3  
Old 08-30-2009, 10:15 AM
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Welcome to FTE.
Since you've already changed the CPS, I am now suspicious of the system that controls the HPOP pressure.
The sensor on the head, if you unplug it, is it oily inside?
Also a sticky IPR (injection pressure regulator) on the bottom rear of the HPOP could be the cause of the symptoms you describe.
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Old 08-30-2009, 10:39 AM
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I pulled the plug in the top of the hpop and it has oil up to about 1" from the top. I have an uncle with a 7.3 and his would run but would not restart, it was a sensor on the hpop but don't know for sure which one it is. I have not checked it for codes, but don't remember seeing a check engine after the truck shut off going down the road. It shut off like you turned off the key.
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Old 08-30-2009, 01:05 PM
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Ive got a pic to help explain the sensor that Dan is referring to. Its the ICP sensor.

I think the hum next to the left battery youre hearing is just the vacuum pump doing its job.
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Old 08-30-2009, 02:38 PM
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I pulled the sensor off the rail and it has plenty of oil there also. Do I need to replace this sensor or should I check for codes. I have not checked for codes but from what I have read, I may not even have a code for this problem(engine shutting down going down the road). What next??
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Old 08-30-2009, 03:37 PM
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If there is oil in the sensor then the sensor is bad from what I remember...

I think this is the part number from Ford: F6TZ9F838A

www.ftepartsguy.com has them for like 125 or so.
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Old 08-30-2009, 03:46 PM
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you don't need to take the sensor out of the head........ just unplug the wires to the sensor and see if there is any oil inside the plug where the wires connect to.
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Old 08-30-2009, 03:50 PM
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Left battery should be drivers side, which would be the ABS pump self testing.
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Old 08-30-2009, 04:00 PM
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If you let it sit for 30 minutes to an hour it will start back up.
^^^^ Most common indication of a bad IPR.
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Old 08-30-2009, 04:09 PM
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Thanks for all the help. no oil at the electrical connection on the head sensor.
Yes if you let it sit for 30 minutes or more it will restart.
I believe from what I hear it is definately the ipr sensor. Can it be seen at all with the fuel bowl still in place. I have looked for it but can't seem to see it. Just the fuel heater plug and the one beside it is the fuel regulator I do believe.
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Old 08-30-2009, 04:12 PM
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My bad, in the picture above what I thought was the fuel regulator is listed as the IPR.
Is it worth trying to tear apart and clean. I found a link and fairly detailed description telling how to tear apart. Or just buy a new one.
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Old 08-30-2009, 05:53 PM
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Quote:
Originally Posted by cleazy55 View Post
My bad, in the picture above what I thought was the fuel regulator is listed as the IPR.
Is it worth trying to tear apart and clean. I found a link and fairly detailed description telling how to tear apart. Or just buy a new one.
You can try. Some people have success, others don't. So it's up to you.

Oh, forgot to mention.... the fuel pump running for 15 seconds with the key on is perfectly normal. It won't stay running until you start the engine.
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  #14  
Old 09-03-2009, 11:04 PM
cleazy55 cleazy55 is offline
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Just to let everyone know, looks like changing the IPR fixed the problem. (One the road again, just can't wait to get on the road again.)
Thanks for all the help.
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  #15  
Old 09-04-2009, 12:07 AM
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Glad we could help and thanks for posting the results!
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Old 09-04-2009, 12:07 AM
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