So what if I run the stock wiring and don't do the direct feed mod ???? The pump wouldn't run at full capacity right ? But a Walbro needs minimum 12 volts and there's a voltage regulator that ups the voltage when revs are raised about 3000 grand right ? So the pump would be working overtime doing the direct feed mod and as Walbro says minimum voltage 12 volts and the specs of the pump would have been tested minimum 12 voltage other wise Walbro would look ridiculous for making fake claims the best thing to do is purchase a hot wire earth kit for your whole car not just up the voltage to the pump