not enough fuel at upper rpms

[bigrd1990]

Well this is my first time posting but I have been lurking for a few months.


Heres my problem I bought my ts 6pos tuner and exhaust and installed them both 2weeks ago. I thought everything was great then I noticed up top around 2500-3000 it feels like its not getting enough fuel. I turned it to my smoke setting and WOW it was fast no hesitations at all.
I did a buzz test and every injector came back fine. changed the fuel filter still no change. I replaced the lift pump back in Oct. I am going to test the fuel pressure tomorrow to see if I have enough psi it should be between 55-75?

When I ran the scanner I got a code p0196 but I am going to double check to make sure my truck was at operating temp to be safe. Forgot to mention I got my chip for KT performance which is a great place Kenny is a good guy.

Thanks for any help
Joe

[bigrd1990]

anyone? know

[Dannj]

your pressure should be somewhere in that range when you test it.

Im confused....you have a ts chip with a smoke tune? or someone else tuned it?

[bigrd1990]

well tested the fuel pressure and it was all over the place. the needle was jumping from 40psi to 90psi at idle. I am so lost could it be a bad fpr? I know the previous owner did the fpr mod with the bb.

I bought the ts chip with I believe phoenix tunes

one other thing could feel the fuel pulsating through the fuel pressure gauge.

[White95f250]

Your pump could be going bad. Is it stock injectors?

I would highly recommend giving your fuel bowl a good cleaning with new hoses and o-rings. Before adding a tuner or doing any mods I recommend doing the basic clean out and check over first to make sure you're good to go.

[bigrd1990]

Stock injectors. I put new hoses on when I replaced the pump.

[bigrd1990]

I mean could the pump be going bad or has been bad and didnt know it?

Could algae be a cause for this?

Im trying to think of anything/everything at this point now.

[Dannj]

the funny part is i answered you and today my truck started doing the same exact thing....weird idle and fuel pressure jumping all over. i have my spring shimmed too.....its snowing here in nj n im done messing around in the cold. im gonna mess with it tomorrow some more. my bet is its my fuel pump not being able to keep up.

[HVAC SuperTech]

Could also be the screen or the sock on the bottom of the fuel pickup in the tnak that's clogged up. I have heard of these things causing big issues like this once higher fuel is demanded from chips

Sent from my Acer Android Tablet

[Fordman247365]

Are you sure its running out of fuel...or is it just running bad at higher rpm's? Does it do it in all the chip positions?

The fluctuation in the fuel pressure is because its a mechanical pump.