running out of ideas here........truck wont turn over completely......battery, starter, fuel pump are all fine.....replaced ignition switch......what else can u guys think of? it has fuel pressure all the way to the rails im just thinking it has something to do with the injectors.........is there a relay or a fuse that controls the injectors at all?.....any help is appreciated. thanks

 

"Turn over completely" - do you mean it cranks but won't fire off? You either have no fuel or no spark. Pull a spark plug and look at it/smell it - If it's wet with fuel, you have a spark issue. If it's dry, you have a fuel issue. Have you reset the fuel inertia switch? Do you have PATS, and if so, what's the "Theft" light doing?

It would help if you filled in your profile with year, model, and engine.

 

Check the main ground for the PATS...I learned this today, I got the nose tore off my truck and it wasn't grounded and it wouldn't start...Does the radio flash quickly, does the THEFT light flash quickly, if it has a digital dash, the mileage will show up as dashes instead of numbers...Should be 2 thick wires on a big ring terminal...

 

2000 f150 v8 4.6 auto

it cranks but wont fire off......the mileage shows up as numbers so i dont think its the pats.....i put some starter fluid through the intake and it will start completely for a few seconds then turn off......im kinda running out of ideas here

 

That probably means the injectors aren't firing. Have you scanned the OBD for codes? Have you put a fuel pressure gauge on the rail?

 

thats what im thinking too......the rail is pissing out gas and there are no codes being thrown

 

bump

 

Have you put a gauge on the rail? Just because it's pissing out gas doesn't mean it's at sufficient pressure.

 

i'll see if my buddy has a guage and check it out......if that is the problem what could be a remedy in that situation

 

Fuel pump or fuel pressure regulator.

 

replaced the fuel pump so thats working fine......i'll check out the fuel pressure regulator tommorrow

 

or the filter since it could be clogged and not letting enough fuel through.