skyludeboy Posted June 20, 2012 Share Posted June 20, 2012 Currently I am in the process of sorting out the existing wiring on my car I just happened to notice that my twin bosch 044 pumps are getting a 12v signal from the cigarette lighter giving them constant power from relays when car is running pumps prime upon ignition, My question is that should this signal be coming from the ecu to power both ecus or should I get the pump in the tank to get triggered by the ecu and the pump mounted externally fed constantly? I also noticed that sometimes the car would stall and turn off while driving for a while around town but I am assuming that could be down to the thin wire used for the signal feed which make the relays hot which I will replace today, can some one also point me out which pin in the ecu is for fuel pump on a jdm 2jzgte non vvt running hks f con v pro with harness. thanks for your help Quote Link to comment Share on other sites More sharing options...
Wez Posted June 20, 2012 Share Posted June 20, 2012 A diagram of your setup would help. Has the fuel pump ECU been bypassed completely? Quote Link to comment Share on other sites More sharing options...
skyludeboy Posted June 20, 2012 Author Share Posted June 20, 2012 the thing is I don't have a supra its a toyota chaser and doubt there is a fuel pump ecu they originally have 1jzgte vvt engine in the from stock this pic shows pump location in tank which pumps fuel to swirl pot heres a pic of the pump and swirl pot this pump feeds fuel straight to the engine and does get hot recently and car cuts off feels like it run out of fuel I let it rest for a few mins and it works again Quote Link to comment Share on other sites More sharing options...
skyludeboy Posted June 20, 2012 Author Share Posted June 20, 2012 can the problem be with the wires causing the pump to get hot and stop working? the wires i am using are as shown in the picture above some amplifier power cables I had kicking about, curious to see what wires people would normally use to avoid the pump heating up issue on similar setups. Quote Link to comment Share on other sites More sharing options...
j.oe Posted June 26, 2012 Share Posted June 26, 2012 Maybe the way i feed my twin denso1020 helps you: I didn't want to miss the ecu's security options like turning off the fuel pump when the engine stops. So i wired the fuel pump ecu output via a voltage divider 4k7 and 1k5 to GND to a darlington transistor. This trans. is pulling two relay coils to GND when it sees more than app. 5 volts at the dividers input, while the other coil sides have +12V ign. supply. Now each relay drives a fuel pump as soon as the ecu sends out either low or high mode voltage. But the relays fall off when the ecu does not. There could be said, this works like a 12V ecu mod with relay amp but still provides the ecu's turn on/off function. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 27, 2012 Share Posted June 27, 2012 Loving the lump hammer Quote Link to comment Share on other sites More sharing options...
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