What does a fuel pump resistor do?
When Idling or low demands the ECU energizes the Fuel Pump Relay and places the resistor in series with the pump and slows it down.
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 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.
What is the fuel pressure of a DISI MZR?
But in both instances, we are not changing fuel pressure, just changing the amount of volume we are sending to the high-pressure fuel pump housing. It is important to note that. The fuel pressure generated by the intake fuel pump is in the 55–71 psi range. DISI MZR OEM Fuel System
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.
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.
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.
But in both instances, we are not changing fuel pressure, just changing the amount of volume we are sending to the high-pressure fuel pump housing. It is important to note that. The fuel pressure generated by the intake fuel pump is in the 55–71 psi range. DISI MZR OEM Fuel System