I have p0171 p0174 p0190 p0191 p0300 and p0303 showing.

I recently changed my fuel pump, about 2 weeks ago. Yesterday driving home my truck really started to hesitate and jerk then lose lots of power. I pulled the codes and had p0171 p0174 p0191 and p0303. Thinking this was the fuel pressure rail sensor I replaced that and also the fuel filter. Cleared codes it ran fine, for 10 minutes.

I read on here that i should inspect my FPDM and replace if it looked rusted or worn out. So that's what I did today and now I am stuck with all 6 of these codes showing.

I desperately need this truck to run. I should point out the misfire in cylinder 3 has been there for a long time and I know it's compression related but all these other codes just started happening in the last 24 hours.

I have cleaned the MAF today and replaced air filter but I don't believe that's going to do anything to help with the fuel pressure issue and multiple random misfires.

Should I replace the fuel pump again? I just have a suspicion that's it since I've replaced everything else and all this seems to have started since I swapped it out.

Thanks,
Nate


2006 f150 4.6L

 

did you replace the FPDM ? why was the fuel pump replaced ?

 

Yes I replaced the FPDM and it turns out all my issues were solved by replacing the fuel pump again. This is the 4th time in 2 years and 3rd time in 6 months I have replaced the pump.

The first time I replaced the pump it was because fuel level sensor broke, the 2nd time was because the pump stopped pumping fuel, the 3rd time again, pump stopped pumping fuel and now this time because the pump was not pumping enough fuel.

I'm lost on why I have had to replace the pump so many times.

 

I guess I'd have to ask what criteria is being used to determine the fuel pump is bad?

 

What brand of fuel pump are you installing? If it was the Airtex one then yeah those have high failure rates .