2001 Ford F150 5.4L 116K starting issue

[loneryder]

Is it hard to change?

You have to drop the tank as it is on top. It shouldn't be an expensive job at your local indy shops. Most have done a lot of them. It's a common failure after a number of years.

 

[loneryder]

I was going to get a fuel pressure gauge and hook it up to the fuel rail.

It starts out intermittent then gets worse over time. So a pressure gauge might show normal.

 

[ARB1977]

I've had the starting aid (starting fluid, brake cleaner etc) punk me when it's a mixture issue. I had a '14 Rogue with bug fried to MAF that sometimes would start (but it ran poorly, although not so bad that your typical oblivious driver might notice) and sometimes not.

Basically the ECM was just REALLY confused and adding a fuel altered the mixture enough to get it to sputter. I nearly condemned the fuel pump but I knew the pump was running and that diagnosis didn't sit right with me. I finally tore out the back seat and cobbled into the fuel supply to verify pump pressure was good.

OP should listen for the pump to prime at key on and find a way to verify fuel pressure -- I don't remember if the bubble bodies got a Schrader valve. My '07 2V 4.6 F150 only has a data PID for FRP - fuel rail pressure.

I’ve got car scanner pro and torque pro I’m going trying those to see if it has FPR.

 

[ARB1977]

Dose anyone know what’s good fuel pressure in the key on position? Like I mentioned before once she’s running it runs great.