Did a search and came up empty handed. Anyone know what the fuel pump discharge pressure prior to the filter is supposed to be as well as the rail pressure? My pump sounds kind of weak, even after the filter change but I don't want to drop $400 for no reason. If I had a tuner I could see the rail pressure but i'll probably just hook a gauge prior to the filter if anyone know what it's supposed to be.
When I turn the key over and the pump primes, it's not a loud whining sound like it used to be. It's more like a slow oscillating sound. The only time i'm having problems is when my truck is warmed up and I go WOT, it spits and sputters. I changed the filter the other day and same problem. I just don't want to go into the plugs/coils if it is fuel related.
Your fuel pressures look like there within tolerance. What's your battery voltage when running? The fact that you don't have any codes is strange. Maybe something is wrong with your throttle body. You could pull the air intake and check to make sure the butterfly on the throttle body is opening as expected when you romp on it. Sounds like its getting lots of fuel and no air if it is bogging down. If there was air and no fuel you would also bog but probably would get a lean code but maybe not, either way I would make sure the drive by wire throttle body is working before doing anything else, easy to eliminate it as a possible issue.
Thanks, I'll check the voltage and Throttle Body, will double check the codes too.
The fuel pressure is being monitored just past the fuel filter with an inline 'T'.
The pressure runs 20psi at idle and increases to ~30psi with acceleration. At start up it
jumps to 40-60psi.