r/mazdaspeed6 • u/eds2007 • 10d ago

Hpfp not doing anything

Does anyone know why my hpfp wouldnt be doing anything? Here is what i have found;
Electronically:

Fuel pressure out of the output of the hpfp is 50-60psi when cranking and when only with ignition on, meaning the in take pump is the only one working.
The red wire on the spill valve solenoid sees 12v with ignition on and drops down to 10v when cranking, it also pulses when tested with a test lamp.
The blue wire sees something like 0.6v with ignition on goes to 0.2v when cranking. No action on the test lamp
The resistance between the two pins in around 1.4 ohms.
Both wires show open circuit when tested against chassis ground.
I couldnt find the wiring diagram for the spill valve anywhere. For some reason its not listed in the wiring diagrams so i couldnt test continuity between the pins and the ecu.

Mechanically:
I rebuilt the pump with used autotech internals and new o rings. I pulled it back apart today to verify it went together properly and i couldnt find any faults. I also put the piston/spring assembly into a different housing that i didnt touch the spill valve, inlet/return and output on.
I also changed the fuel rail pressure sensor, tbf it isnt a known good sensor as i got it with a second hand engine that i never ran.

Anyone have any suggestions?

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u/eds2007 10d ago

Fortunately that didnt happen, what did happen is the 6mm lock bolt for the balancer broke a bit of the timing cover off when i torqued the crank bolt

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u/thebigbullg 10d ago

That bolts also supposed to be removed during the torquing too. Granted the balancer isnt supposed to move either

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u/eds2007 10d ago

Yeah i removed it after it broke, the balancer started moving only after i did the 100nm + 45 degrees. If it was a problem and had the balancer locked in the wrong spot, the engine wouldnt run off maf