You do not want to get a relay that cannot handle the amperage that your fuel pump might pull causing the relay to fail, and you to be stranded on the side of the road. The relay you need should be a four-prong relay with at least 14-gauge wiring. Once that wire has been found cut that wire so that you now have half of that wiring running to the fuel pump, and the other half running to the factory ECU. At the wiring you need to find the 12v supply wire from the ECU to the fuel pump. The steps of re-wiring your fuel pump are to first get to your fuel pumps wiring. The best way to avoid this is to wire the fuel pump to have a dedicated voltage line right off the battery so that it consistently performs. Motors running right on the edge of tuning could go slightly lean enough to start detonation in the motor and cause a total failure. When we are running a performance car at the limits, having a fuel pump start to lose voltage, and therefore lose flow, can cause catastrophic problems. Just think about when you have the radio turned up, or running the high beam lights, or maybe when the alternator starts to weaken. If there are any fluctuations in voltage in this system, the fuel pump will also be affected. The factory wiring of the fuel pump is tied in with many other parts of the cars electrical system. Also, with the average fuel pump replacement cost between $300 and $700 dollars, making sure the wiring is functioning properly is essential. What I am saying is that we want to make sure that our fuel pump is receiving 14 volts when in use to be sure that our fuel pump is working as efficiently as possible. The purpose of this is to make sure that the fuel pump is getting a good, clean voltage that won’t fluctuate or change based on other electrical conditions the car is going through.
#Whatsize fuel tank does a 93 bmw e30 have mod#
When putting in an aftermarket fuel pump or looking to get more fuel out of your factory pump, one mod worth doing is re-wiring that fuel pump. Installing a dedicated voltage supply line for your fuel pump
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