berg Posted October 3, 2016 Share Posted October 3, 2016 (edited) Ive fitted a wolbro 485 and have done the fuel pump mod using a relay Everything is wired as per the diagram everyone posts on here Strange thing is i can hear the pump whining constantly with just the ignition on Im yet to test it with a meter, that will be tomorrows job But i was under the impression that the pump wont be on until you crank the engine? Ive triple checked wiring and everything matches, ive disconnected the relay and tried again and pump is dead as expected as they wont run with the stock 9v I also fitted an AEM FPR at the same time which with ignition on is reading 40psi (engine off), i werent sure if the pump would keep running until a certain pressure was reached but ive adjusted the pressure and its still the same (40-42psi for the supra so im told) Anyone able to shed any light? Edited October 3, 2016 by berg (see edit history) Quote Link to comment Share on other sites More sharing options...
jon07043278 Posted October 3, 2016 Share Posted October 3, 2016 Surely the pump will run continuously when switched to ignition on? The pump won't turn off when it get's to the correct pressure, the pressure relief valve will just allow fuel to return to the tank. That's what i thought anyway. Quote Link to comment Share on other sites More sharing options...
berg Posted October 3, 2016 Author Share Posted October 3, 2016 Doing the 12v mod using the relay it should work as it did before, only when the pump is running it will see constant 12v not the variable 9v-12v Normally the pump will prime for a couple seconds then go off until engine is started But now it seems to always be on You are right about the pressure relief valve Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted October 3, 2016 Share Posted October 3, 2016 You should just here it prime for a second or 2 and then silence with or without the 12v relay mod. The 12v relay mod just bypasses the pump control module so the pump is running 12v at low speeds and low revs. I've done the 12v mod as I felt its worth doing due to bigger injectors ect, but the pump wont sound any different. Quote Link to comment Share on other sites More sharing options...
berg Posted October 4, 2016 Author Share Posted October 4, 2016 Yep i know that, but with this done mine is on constantly with just the ignition on Im starting to think i have an issue somewhere else now as the relay/wiring is spot on The whole fuel system is new aswell as the link ecu thats just been fitted Quote Link to comment Share on other sites More sharing options...
berg Posted October 4, 2016 Author Share Posted October 4, 2016 Tested with a multimeter today With ignition on i am seeing 11.7v at both the pump ecu and the pump itself Could this be anything to do with the new link ecu and the fuel pump ecu configuration? Link ecu is straight out of the box, nothing setup yet as i havent got to that part yet Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted October 4, 2016 Share Posted October 4, 2016 (edited) If you are running a link you need to fuck the pump ecu off and replace with a relay. I use one of the pump ECU control wires as a ground switch from the ecu. Which Link ECU are you running or do you have the plug in? Edited October 4, 2016 by Nodalmighty (see edit history) Quote Link to comment Share on other sites More sharing options...
berg Posted October 4, 2016 Author Share Posted October 4, 2016 (edited) If you are running a link you need to $#@! the pump ecu off and replace with a relay. I use one of the pump ECU control wires as a ground switch from the ecu. Which Link ECU are you running or do you have the plug in? I have the G4+ plugin This is how its wired Ive popped the stock ecu back in and now the solid blue wire (blue&orange in my case) shows 12v which i guess is for the ecu feed and the output to pump shows 0v But the pump doesnt prime, fuel pressure remains at 0 Surely it should run the pump for a few seconds and then go off? Edited October 4, 2016 by berg (see edit history) Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted October 4, 2016 Share Posted October 4, 2016 The relay requires a certain voltage level which the Fuel ECU may not be giving at zero rpm. Link may drive the inputs differently to stock which could be why it's not working. Have you configured the Link fuel pump yet (if you can on the Plug in)? Quote Link to comment Share on other sites More sharing options...
berg Posted October 4, 2016 Author Share Posted October 4, 2016 Ive got as far as map sensor calibration and throttle position Thats all the link instructions say to do pre first startup fuel pump configuration i havent looked at and wouldnt know how to, I wanted to at least have it running and give it a full check before it goes to the mappers but thats looking unlikely now Trying to do the PCLink stuff but after the pump is running on ignition for about 1 minute it starts making a very loud buzzing noise which doesnt sound too good, if i switch off and back on its ok for another minute then does it again Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted October 4, 2016 Share Posted October 4, 2016 I've PM'd you some instructions on how you should be able to delete the pump ecu and just use the relay. You need to load the default "Supra G4+ plugin" map and store it to the ecu before you do anything else and then make the changes. Quote Link to comment Share on other sites More sharing options...
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