Help!!
99 f150 edge k&n intake and 2.25 dual exhaust... And have no codes to show anytrhing....

Ok guys I had posted last week bout my truck that it was running ruff and wasn't good at all.
Well I played around with 2 differnt maf sensors and cleaned them both and none of this helped the truck what so ever...
Well today I decided I was gonna chane the fuel filter so I changed that and put seafoam in the truck napa recommended it..
Well I started it up with the orignal maf that it use to run great on and it ran great for the first 5 seconds then it started chugging and seems like its starving for fuel almost.

If I jus start the truck up let it idle down foir a second then rev it up it runs flawless for the first 2 times I rev it up then let it idle down and it starts chugging..

It seems like its missing fuel I don't know what it could all be I don't understand...
I can rev it up right away and hold at 3grand and it will stay there and run great but when I let it idle down it starts chugging again..

What all would it be?
Fuek pump? Is there a fuel regulator? Is it something else that could throw it off? I don't understand and I have to get the truck fixed!
Any ideas is appreciuated
Thanks
David

 

do a fuel pressure test. should be 40+lbs

 

Snag up a fuel pressure kit, check to see what it's getting. Go from there. This is not intended to say that you did or not, just a suggestion.. You sure you got the flow direction on the filter faced the right way? I'm not even sure if its possible, can't remember. Just a thought though.

 

Ok guys I'm getting a fuel pressure kit tommrow after work and going to try it out.
It needs to b 40psi though? And if its not it would b the pump or fuel pressure regulator? Or what? And where is the fuel pressure regulator on this truck?
Sry for all the questions
But thanks guys

 

O and the filter is on the right way the arrow is going the right way... But thanks thou

 

get a haynes or chiltons manual for you truck. follow the diagnostic steps outlined in those.

 

have you cleaned the throttle body? not saying this is your problem, but i cleaned a friends out this past weekend as his was doing the same thing. it would idle very rough, sometimes not at all. once the rpm's were around 2 grand, it would run perfect. cleaned it out and it has been running perfect every since.

 

well tommrow i am going to get the fuel pressure and make sure that is at 40psi if it is then i will pull throttle body and clean everything off and out and go from there tommrow i will see what i can do...
thanks i will be in contact tommrow

 

Ok guys I went and bought a fuel pressure thing..
Well I got it to work and I'm only getting 30 psi and a lil more whem rev it up so....

What would cause this fuel pump? Or pressure regulator? Or what would you change first??

Let ne know asap

 

Filter then pump.

 

Have you checked to make sure there are no codes? I mean actually put a code reader on and checked. Just thinking maybe your SES light is out and there might actually be codes to lead you in the right direction.

 

30psi is low. clogged filter or bad pump most likely.

 

I have a edge and yes I checked it the only codes I got is a lean code.. I'm changing the fuel regulator now and if that doesn't work the pump is going to be done nxt..

 

The filter was just changed and that is the orignal filter that hss 358000 miles on it and it was clean I still put a new one on so I'm assuming it is fuel pump...

 

yeah thats why the pumps bad. Been pushing fuel through a clogged filter for ever. Makes them wear out. although 358k on the pump is pretty good. Cant complain about that.