Scott Posted November 15, 2015 Share Posted November 15, 2015 There's mixed opinions on the 12v mod so I thought I would look for fresh input and ideas with what road to go down. I'm going to fit a walbro 400 to give my fuel system a bit of a boost, along with the 8AN lines it should help with my current limitations. However, what do I do with regards to the wiring? Do I keep the Fuel ECU in place and possibly upgrade the wiring? Or should I bypass it altogether? Thanks Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted November 16, 2015 Share Posted November 16, 2015 Ill tell you that, on my Aristo, the stock wiring that runs over the fuel tank had got hot enough to damage the insulation. Car had been running a big fuel pump for a while before I got it so no idea how old the damamge was. I uprated everything from the fuel pump ECU to the tank. Quote Link to comment Share on other sites More sharing options...
Scott Posted November 16, 2015 Author Share Posted November 16, 2015 Would you say that the wiring to the pump ecu itself is ok? Also, did you leave the ecu working as stock, not forcing 12v? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 16, 2015 Share Posted November 16, 2015 I think if your going to be driving a bigger pump (more load) than the pump ECU/wiring is intended for it would be worth junking the ECU an rewire, too much load on either could result in overheat which is not ideal, that would apply to the supply both to and from the relay, however it does depend on what the pump current draw is. Quote Link to comment Share on other sites More sharing options...
Scott Posted November 16, 2015 Author Share Posted November 16, 2015 Absolute maximum 20A, I think it'll be around the 15A mark most of the time. I'm worried about ditching the fuel ECU as I've read a lot of reports of it shortening the life of the pump. Apparently the ECU does a good job of keeping the voltage supply to the pump minimal, only hitting full when required. I don't know much about it though and some of the threads are very old, hence why I'm looking for fresh info Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted November 16, 2015 Share Posted November 16, 2015 I think most fuel pumps are designed to handle a range of voltages, like most circuits on a car, as despite the charging regulation, the voltages range from as low a 10v to 15v, I know certain parts of the system have there own built in voltage regulation, but in general its more current draw that will have most impact, especially on something like a fuel pump that has to vary its current draw in line with fuel demand. Quote Link to comment Share on other sites More sharing options...
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