dr_jekyll Posted August 2, 2012 Share Posted August 2, 2012 what is the propper way of running 12v fuel pumps. i was going to run my pumps on a relay triggerd by the stock pump feed wire but as its 9v it will not flip the relays , ive seen the fuel pum ecu completely replaced by a relay, how would this be wired ? Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted August 2, 2012 Share Posted August 2, 2012 If you are running stock ECU then you wont be able to remove the fuel pump ecu. This is due to the Fuel pump ecu giving a digital signal back to the engine ecu to tell it that the fuel pump is running. If you are running aftermarket management, then you can replace it with a relay. You simply use the power in to the fuel pump ecu as relay power in. The output to the fuel pump from the fuel pump ecu as the relay out. Then use one of the other wires, I think the green one from memory, from the fuel pump ecu as a trigger wire, triggered by the aftermarket ECU. The green one runs to the footwell by the ECU. Is your ecu capable of giving negative outputs? The easiest way to do it is to assign the fuel pump to a negative out from the ECU, connected to the green wire, to trigger the relay. Obviously you will need a positive half of the trigger system. Simply T off from the power in to the fuel pump ecu. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted August 2, 2012 Author Share Posted August 2, 2012 are im on a stock ecu with piggyback. is ther a 30amp relay available that will switch a 9v and not cack itself when the pump ecu switches to 12 Quote Link to comment Share on other sites More sharing options...
hodge Posted August 2, 2012 Share Posted August 2, 2012 It's a pretty easy job. Use the live an earth from the pump ECU to a 12v relay switch terminal. Take a constant 12v from the battery to the relay and 12v out to the pump. Make sure you earth the pump to the chassis with the same AWG cable the live is. Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted August 2, 2012 Author Share Posted August 2, 2012 i didthat but it wouldnt switch. but when i ran a 12v ign to test it switched fine? i thaught its prob because of the low output of the pump ecu Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted August 2, 2012 Share Posted August 2, 2012 Does the piggyback not have a spare 12v output you could use to switch a relay? Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted August 2, 2012 Author Share Posted August 2, 2012 ill take a look. dont think so though Quote Link to comment Share on other sites More sharing options...
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