I have a no start issue after replacing the fuel pump on my 2007 5.4. I replaced the inline fuel filter, filled the tank with fresh gas. Started and ran for 10-12 minutes fine, no missing etc. Then it stalled. Now it starts for half a second and stalls or doesn’t start or almost starts. I disconnected the fuel line at the fuel filter and the pump is sending gas as the engine is cranking. fuel gauge reads full as it should.

previous experience with fox body mustangs and efi town cars tells me that maybe air needs to be purged from the fuel rails/line etc but there is no valve to do that. Why did it run fine for 10 minutes? I don’t know, it’s a mystery. What the heck am I missing?
-replaced fuel pump control module and cleaned the ground wire on the frame near the spare tire, no change.
thanks in advance for any help

 

I don't think its an air trapped issue . I replaced fuel filter and all injectors no hint of that .That fuel pump should push any air out with no problem .
We need to see the codes Unless you think there may be junk in the fuel lines due to some contamination that you suspect . Or something clogging injectors . Usually your gut tells you its a fuel problem from the way its acting . What does your reader say about the pressure on the rail ,torque pro will tell you .If you think the fpdm is not working new or old you can jumper 2 to 3 on fpdm for test . That provides ground for fuel pump that controls fuel pump .


Sometimes the gasket on fpdm connector will roll and push it apart intermittently. Drove me crazy .

 

When I changed the pump I had a low fuel pressure code and a cam position Senor code. I have had the cam position sensor code for over a year. After changing the pump I cleared the codes and of course the cam position sensor code came back.

after changing the pump I ran it for 10 minutes but didn’t move it. Just let it idle, revved it, put it in drive and reverse.
you’re saying the connector on the fpcm could be loose or intermittently loose?
I haven’t made a jumper and tried that yet. I don’t think it’s a fuel contamination issue and I dont think it’s a fuel injector issue.
I also remember on earlier ford efi systems, the IACv (idle air control valve) could cause similar issues but I don’t see one on the upper intake or throttle body 🤷🏼‍♂️

 

the 5.4 3v don't have one.

 

Not sure what code(s) it has now.

 

Only code is cam position sensor

 

No you don't have an IAC, or an egr or a fuel regulator . There is no return line to the tank . This is fuel on demand .
Yes I experienced intermittent connection on the fpdm due to a rolled gasket in fpdm connector . it would run maybe ten miles and then then quit . The fpdm is monitored by the pcm which looks at the fuel rail pressure sensor . It is subject to connector problems under the drivers side seat also dirt etc gets in there .
You need to see if you have power etc at the fpdm . One good test is to jumper 2-3 which applies the switched ground to the fuel pump if pump runs and truck starts that rules out pump and proves you have 12vdc positive to fpdm and then to pump .
All mechanics will tell you new does not mean good . Does it run when you spray fuel into throttle body -avoid maf sensor . Maybe your old pump wasn't bad , could be an electrical problem thats intermittent and it started working after you disturbed wiring . A test light works better than a meter because it draws load and it is way easier to see . You can run a negative wire from battery terminal for test so you can rule out rusty grounds back there .
Did you replace the whole fuel pump assembly or just the pump . You dropped it with a full tank ??? Or was it able to be done by pulling bed . My super crew access is under the cab . Could your gauge be wrong ? I'm ruling out an empty tank . You would not be the first for that to happen to .
I see you filled it with fresh gas ,how did you get to a pump or did you put 5gallon cans in ?
My stepson went thru so many fuel pumps that he cut a hole in the bed to get to it . Cheap pumps I guess .

 

It would help to know the specific code.

I would resolve this first because from what I've read a bad cam sensor can cause a no start condition.

Also, from what I've read a 2007 F150 has two cam sensors, one mounted on the cylinder head, front, beneath timing belt cover and the second located in the right side of the engine compartment at the rear of the valve cover, near the intake manifold.

I'd try disconnecting then reconnecting the one on the right side first because it's easier to get to, unless the code is specific to the other side. If it still doesn't start I'd disconnect the sensor and see it has any effect on cranking ( actually I would research this first to make sure this won't harm the engine).

Hope this helps.

 

One more thing, you can test the sensors with a voltmeter. I found at least one YouTube video showing how to do that.

 

What would happen if…….,.


what if the truck was originally a flex fuel vehicle/system and a regular “gas” fuel pump assembly was installed, instead of a flex fuel. This truck has no flex fuel badges, it has a regular gas cap with no flex fuel marking buttttttttttttttt when I had the dealership run the vin it’s comes up as a flex fuel 5.4 not the regular gas 5.4. The engine is not original. I’m guessing the ECU is original and setup for flex fuel

hmmmmmm