Where is the fuel pump on a Mazdaspeed 3?
In order to get the best understanding of the fuel system equipped on these DISI engines, I find it best we start at the very beginning, and the very beginning is in the fuel tank in the rear of the car. Both the Mazdaspeed 3 and Mazdaspeed 6 are still equipped with your modern electric in-tank fuel pump.
What happens when PCM de-energizes the spill valve?
When the PCM de-energizes the spill valve, the pintle is forced short with the assistance of a return spring. At this point, the fuel is now isolated in the actual fuel pump chamber and is ready to be compressed and have its pressure raised to feed your fuel rail.
What should the fuel pressure be on a Mazda?
Now, let’s start down the diagnostic path of trying to determine why we are having low fuel pressure issues. With the key on and engine off (KOEO), you should have 55–71 psi registering on your Accessport. This pressure should hold steady for a few minutes until the EVAP system slowly drops the pressure and everything leaks back down.
How does the HPFP work in a Mazda?
At this point, the fuel is now isolated in the actual fuel pump chamber and is ready to be compressed and have its pressure raised to feed your fuel rail. As the engine rotates, the trilobe on the end of the intake camshaft drives the HPFP internals and compresses your fuel.
In order to get the best understanding of the fuel system equipped on these DISI engines, I find it best we start at the very beginning, and the very beginning is in the fuel tank in the rear of the car. Both the Mazdaspeed 3 and Mazdaspeed 6 are still equipped with your modern electric in-tank fuel pump.
When the PCM de-energizes the spill valve, the pintle is forced short with the assistance of a return spring. At this point, the fuel is now isolated in the actual fuel pump chamber and is ready to be compressed and have its pressure raised to feed your fuel rail.
What should the pressure be at idle on a Mazda?
Pressure, at idle, should be somewhere in the range of 400+ PSI for this vehicle. If you’re seeing a PSI under 100, then the pump is not creating any pressure and it’s just flowing through from the in-tank pump. If you’re seeing a PSI in the 200s, then your pressure relief valve may need to be replaced.
What is the misfire code on a Mazda?
The other type of misfire code is anything above P0300: P0301, P0302, etc. The last digit indicates the cylinder number that the misfire is occurring on. This means that there is a clear pattern for a misfire occurring on that specific cylinder.