2008 ford f150

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  #1  
Old 07-23-14, 11:10 PM
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2008 ford f150

I am having trouble not often but it has happened 2 times in last 2 weeks.The problem is that while driving I seem to lose power and if you give it gas it does no good doesn't shut completely off right away but within 30 seconds it will shut off like its running on 1 cyclnder.After sitting awhile maybe 15 min or less it will crank and run fine untill it decides to do it again.I have put new plugs and changed fuel filter.Had it towed to ford dealership and they said they could find nothing wrong with it.When you try to crank it does crank but will only run a few seconds and sounds like it not getting enough gas and after cooling down will crank and run fine.Any help appreciated.
 
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Old 07-24-14, 04:48 AM
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Mccoy, it sounds classic computer module malfunction, not sure. Odd the dealership didn't find anything wrong. Of course if there is trash in the tank, the fuel pump could be picking it up causing poor fuel flow, which you say it sounds like. But that's before the filter, and may not be readily accessible.
 
  #3  
Old 07-24-14, 08:28 AM
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Sounds like fuel pump overheating and shutting down.
Another slim possibility I have encountered is the collision switch corroded internally from pump drawing too much current and overheating the switch. Best of luck on your sleuthing.

RR
 
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Old 07-24-14, 08:33 AM
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Did they check the computer for codes at the dealership?
 
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Old 07-26-14, 03:35 PM
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I suspect fuel pump dying when hot, but pressure good when cool. Either you run it on a hot day and try to time it that you are close to shop where they can test fuel pressure when it happens, or have them make sure they let it run in yard,under hot sun and see if it will happen. Luckily I borrowed a fuel pressure gauge and attached it when it started to act up. Went down to 2-5psi when hot and once it cooled went back up to 45-50 which was proper on my vehicle.
 
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Old 07-26-14, 04:38 PM
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Bad/dying fuel pump, bad fuel pressure regulator or bad ground to the fuel pump. Could also be a temporary restriction, though not as likely.

Unplug the vacuum hose from the fuel pressure regulator. Verify there is vacuum. When you unplug the vacuum hose while testing fuel pressure, PSI should jump 5-10 lbs.... and drop back to normal when you reconnect the hose.

If you can pinch the fuel return line shut (steel lines require a special fuel testing harness for this), and the fuel pressure rises sharply, replace the regulator. If the pressure doesn't rise at all, replace the fuel pump.
 
  #7  
Old 07-28-14, 09:52 PM
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Originally Posted by mitch17 View Post
Did they check the computer for codes at the dealership?
They did a diagnostic check but said nothing showed up.
 
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Old 07-28-14, 09:56 PM
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Sounds like fuel pump to me.. Bad ground is common.. Change fuel filter too...
 
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Old 07-28-14, 09:58 PM
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  #10  
Old 08-08-14, 10:07 AM
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I am going to change fuel pump module and will let you know if it corrects problem. Thanks for all help
 
  #11  
Old 08-28-14, 08:36 PM
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I just wanted to let you know I did change the fuel pump Driver module out which cost me $114 but I have not had the first problem I was experiencing. This saved me a lot of money and I really do appreciate your help.
 
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Old 08-28-14, 09:12 PM
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Thanks for the update. keep us posted of the longevity of your fix...
 
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Old 08-28-14, 09:13 PM
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That's great news wheelers! Kudos to Mike for finding that youtube video!
 
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Old 08-29-14, 04:05 AM
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Did you do the swap or did you have to take it to Billy Cain?
 
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Old 08-30-14, 04:57 PM
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I changed out myself not sure what you mean by taking it to Billy Cain.
 
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Old 08-30-14, 05:08 PM
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not sure what you mean by taking it to Billy Cain.
Must not be from the same parts of town I reckon'....

LOL...

Billy Cain Ford | Ford Dealer | Banks Crossing
 
  #17  
Old 09-18-14, 10:14 PM
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Just wanted Mike to know and every one else that my truck has ran fine since replacing Driver Module Regulator.Again Thanks for your help
 
  #18  
Old 09-18-14, 10:35 PM
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Great!!! Thanks for the reply... we appreciate it and love happy endings here at DIY..................


 
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