Fuel Pump Prime
Looking to come up with a logic that will allow me to prime the fuel pump if ign is in run and fuel pump is active. I want it to prime until desired fuel pressure is reached and then reset until after a start attempt. If engine is running I currently want this fuel pump to be on 100%. The ECU monitors FP and sends it via CAN.
would the logic be
On if
keypadfuelpump = true
and
keypadign = true
and
fuelpressure < 350kpa
and
engineRPM < 400
or
keypadfuelpump = true
and
keypadign = true
and
engineRPM > 500
possibly add a hysteresis of 100kpa as the ECU compensates for FP so it would still do its proper cold start even a little low on FP.
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The fuel pressure is being delivered over CAN and I have a start sequence that provides ample time for everything to wake and establish on the bus. The ECU sends a MREL-enable type signal to tell the PDM that all of the electronics have communicated and that starting is allowed. I also use this to prevent the starter being engaged with engine running. I will hopefully have a chance to program it and test it tomorrow afternoon.