Grant Baker Posted February 5, 2016 Report Share Posted February 5, 2016 Hey Guys,If you had two fuel pumps (lift and high pressure) and you wanted to switch one on before the other, is this feasible?So for example, you switch on the ignition and would like the lift pump to turn on (for example) 0.5s before the HP pump.I can see that you can set 2x Aux Outputs for Fuel Pump Control, but prime time is a single variable. Quote Link to comment Share on other sites More sharing options...
Leiden Posted February 5, 2016 Report Share Posted February 5, 2016 Could you just configure the Aux outputs as a GP Output, set 'SW Cond 1' to 'Timer 1 >' and then set the delay time? The downside to this is there is no prime unless you did some clever things with the conditions & timers, you could say have the HP pump activate after the timer reaches 0.5s, then deactivate when the timer reaches 4s (or however long you want to prime) then activate so long as the RPM is above 50, Cond(1 AND 2) OR 3 looks promising I played around and it looks like this might work, so long as the Timer 1 basically starts counting from the moment the ecu is powered. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 9, 2016 Report Share Posted February 9, 2016 (edited) As Leiden said, you may be able to set the lift or fuel pump up as general purpose output. I would recommend putting an engine speed condition in there, so that should the car be in an accident and the engine stalls, the fuel or lift pump will shut off. Edited February 10, 2016 by Scott Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted February 9, 2016 Author Report Share Posted February 9, 2016 Thank you guys.I'm going to try them both coming on together initially and see what happens. Quote Link to comment Share on other sites More sharing options...
quattro5v Posted February 10, 2016 Report Share Posted February 10, 2016 .... I would recommend putting an engine speed condition in there, so that should the car be in an accident and the engine stalls, the fuel or lift pump will shut off.... Great advice. Quote Link to comment Share on other sites More sharing options...
Leiden Posted February 12, 2016 Report Share Posted February 12, 2016 (edited) The GP Output function I posted above waits 0.5s, primes the pump until the timer reaches 4s, the pump will run when the RPM is above 50 and will kill the fuel pump if the RPM falls below 50. Use that for your high pressure pump. You can adjust the timer depending on how long you want to wait before the prime and how long you want to prime for Edited February 12, 2016 by Leiden Scott 1 Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted February 24, 2016 Author Report Share Posted February 24, 2016 Tried this and it didn't work...Not sure why, but won't play ball...Ended up just using an RPM based GP Output condition so that it just turns on the high pressure pump when at 50RPM or more.Weird one I did find is that if we set both fuel pumps as "Fuel Pumps" in the outputs, it will only fire one pump! Can't work out why.Any ideas? Quote Link to comment Share on other sites More sharing options...
Simon Posted February 25, 2016 Report Share Posted February 25, 2016 The way the ECU reads the assigned outputs it will only operate one of the two. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted February 25, 2016 Author Report Share Posted February 25, 2016 Ah right. That makes sense then. Maybe this could be added to a later version of the software? Pump 1 and Pump 2? Quote Link to comment Share on other sites More sharing options...
Steve Posted February 25, 2016 Report Share Posted February 25, 2016 You can use "Fuel pump SPEED" for the other pump. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted February 25, 2016 Author Report Share Posted February 25, 2016 Fuel Pump Speed has a frequency associated with it for some reason? Quote Link to comment Share on other sites More sharing options...
Steve Posted February 25, 2016 Report Share Posted February 25, 2016 (edited) You are right. You can do it like i did then. Use a GP output with the conditions of your choise. Pictured is how MY second pump is switched on Edited February 25, 2016 by Steve Grant Baker 1 Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted February 26, 2016 Author Report Share Posted February 26, 2016 Thanks! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.