Tilting the bed method of changing fuel pump
11-01-2016, 08:41 AM
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Tilting the bed method of changing fuel pump
I saw a video where a guy did a fuel pump install by taking off the bed bolts on the fuel tank side of bed, and then loosening them on the other side. He then disconnected the filler tube from the bed, unplugged the tail light harness and then lifted the bed and put a 16" piece of 2x4 in between the bed and the frame to prop it up. This seems like the best way to replace the fuel pump to me. He did this on a 2007 Silverado. But I don't see why it would be any different on an 09 F150.
11-01-2016, 08:46 AM
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Mark
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you sure you need a fuel pump ?
11-01-2016, 09:10 AM
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To be honest I am not! Today it exhibited the symptom again. And it only happens when it sits for long periods like over night. Same old story, starts right up, and then dies. I bought a fuel pressure gauge over the weekend to observe what is happening. The real weird thing I noticed though, is when I put the fuel gauge on, upon starting the car, the pressure is initially at 50 psi, and when starting it, it drops down to 30 psi, but then goes back up to 50 psi and stays started. It's as if attaching the fuel gauge helps it! If I don't put the gauge on, it takes about 30 or so starts before it stays on. I did the fuel pump fuse relocation fix yesterday when I got home in hopes that maybe it was this. I have changed the TPS, and put in a used throttle body for giggles. I did order a fuel pump, but I'm not sure if this is it!
Last edited by slipmahoney; 11-01-2016 at 09:12 AM.
11-01-2016, 09:19 AM
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Mark
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is there a fuel pressure regulator on your motor ? not sure which motor you have.
11-01-2016, 09:32 AM
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11-01-2016, 11:23 AM
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I don't believe it has a pressure regulator, I don't see one anywhere. Rockauto list a fuel pressure sensor for this motor, but I don't see that either. So you don't think it is the fuel pump. What else could it be. This problem does not produce a check engine fault code. It is rather odd that it only fails when it sits for over 4 or 5 hours. I would think if the fuel pump was faulty, it would fail at random times.
11-01-2016, 11:56 AM
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I think you'll find the fuel pressure sensor controls the pump driver module, which is how the pressure is regulated. Ford chose to use variable pump speed instead of a steady state pump and a regulator. Based on odds/probability, my first suspect would be the driver module (aka FPDM) followed by the pump. The driver is located above the spare tire. Clean it up and remove/inspect it. If the case shows obvious corrosion, you probably have your culprit. Once a little moisture gets in you can get all kinds of strange behavior.
Last edited by PerryB; 11-01-2016 at 12:07 PM.
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11-01-2016, 01:21 PM
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Mark
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Don't think the 09 has a FPDM...
11-01-2016, 01:28 PM
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It doesn't, I looked.
Here is something odd. I left the fuel pressure gauge attached when I went to work. When I went to lunch, it started and it did not die.
! Somehow having the gauge hooked up has a positive effect. I am reluctant to put the fuel pump in if it is not necessary. Maybe I'll buy one of the pressure gauges with a schrader adapter and just leave it on! 
Here is something odd. I left the fuel pressure gauge attached when I went to work. When I went to lunch, it started and it did not die.
! Somehow having the gauge hooked up has a positive effect. I am reluctant to put the fuel pump in if it is not necessary. Maybe I'll buy one of the pressure gauges with a schrader adapter and just leave it on!
11-01-2016, 01:36 PM
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