low fuel pressure

Lately I've been having a issue where the car will randomly run lean at idle. Some times when the lean condition happens the HPFP psi will drop down to the lower 400s. Other times pressure will hang around 420-430psi but will still lean out. At times even getting to 16.38 for a second or two. I...

This might help those who anyone who's experiencing fueling issues and reading 0psi of HPFP fuel pressure, or those who swapped in a JDM motor to replace their stock one like I did. TLDR: Bosch 0261545038 is the sensor you need, use a 27mm deep well socket to remove/install. The stock motor on...

EDIT: The fuel pressure sensor itself was my issue, not the ITFP relief valve. I wrote a thread about replacing it. After swapping the motor in my 2012 Speed3 at the end of July because the stock one threw a rod I started experiencing some fueling issues. The engine ran great across the rev...

My MS6 has developed a misfire on cylinder three and threw both p0300 and p0303 codes. The spark plugs are all good and gapped within factory spec, I tried checking the coil packs. But after clearing the code to see if the cylinder switched along with the coil pack, the check engine light has...

Hello guys, this is my first post and also my first Mazdaspeed 3, I got a problem and i'm out of ideas; my HPFP is not running, I can't hear it, I checked the voltage from the connector to ECU and it reads 8 volts. My car is just running with the fuel pressure from the pump in tank. I connected...

Car: 2008 Speed3; 3.5" intake, CS turbo back, AT internals, Reyes Wiretuck, AP v3, (Same tune for years), Damond PCV plate with dual CCs. 180 compression all cylinders, last checked 07/10/2020. Issue: KOEO fuel pressure won't go above 36psi. HPFP pressure won't go above 1060psi after the car is...