New style 04 F150 Fx4 w/5.4 Fuel pressure/pump issues
Before you all respond asking about these I figured I'd post em ahead of time!
-New fuel filter about 500miles ago wix brand to be exact
-Rebuilt fuel injectors from rockauto which I just installed a month ago
-I have the edge evo programmer which is what I thought was causing it so I put it back to stock and the issue still continues, but this is how I'm seeing the fuel rail pressure and the code it throws.
-And I had already taken the fuel module off when I saw the post and cleaned it up and painted it a couple months ago, it didn't need it but I figured a little paint won't hurt.
I'm having issues where after long periods of driving my truck will start surging at around 3000 to 3500 rpm and I notice a fuel pressure drop and of course the code p0191 I believe which is fuel rail pressure sensor performance out of range or somethin like that, from the low fuel pressure anyhow.
So obviously I'm assuming I need a new fuel pump right, but it seems like right around that rpm range the fuel pressure just drops rapidly from 40-50 to 4-10psi. And I've placed it in neutral and turned the truck off and turned it back on when it's done this and doing that seems to allow me to accelerate a bit quicker but the issue comes back within seconds.
So I'm wondering could this be an FICM (Fuel Injection Control Module) issue or do they only put those on diesels?
Or could it be a fuel pressure regulator? Which I found is unfortunately on the fuel pump assembly itself.
Or do some fuel pumps just go halfway out and do funky stuff like this?
Thanks for your advice in advance.
I'm dreading the fuel pump change that's why I'm trying to exhaust all other options first.
Also if this is a fuel pump issue what is a reliable replacement?
Something stock? or is there a good performance pump that won't empty my wallet?
Cause I've seen some posts of people replacing their fuel pumps multiple times.