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 pumpthe purpose of this is to make sure that the fuel pump is getting a good clean voltage that wont fluctuate or. Fuel pump wiring for the red circuit is generally going to carry a much higher current than the relay.
Fuel Pump Hotwire Kit 3s
Wiring fuel pump gen2. Then a second wire goes from that same location too the outside lug of the starter solenoid. In the picture below mercruisers recommended method. The diagram is color coded per circuit and only a few things may need to be said. Power to the pump comes from either outside lug on starter or from oil switch. I want to do the stock wires into a relay to trigger my new wiring. How to re wire a fuel pump off a relay.
Basic safe electric fuel pump wiring diagram this is the basic wiring diagram for safe electric fuel pump wiring. You will generally find a 1 2v lower than battery voltage at the pump through factory wiring which in big pumps can be 50 100lph less flow. It shows the elements of the circuit as simplified shapes as well as the power as well as signal connections in between the devices. The diagrams and photos show how to wire up the fuel pump and oil pressure switch to a commonly available industry standard iso type 1 form c single poledouble throw spdt relay. I gained 12 psi of fuel pressure with only upgrading the fuel pump wiring. So use a larger gauge wire for lower voltage drop.
Big fuel pumps like the walbro 400lph pumps and the 300lph pumps from other makes require better voltage and current than the factory pump wiring can provide. Upgraded fuel pump wiring. Fuel pump wiring upgrade kits. Assortment of 24 valve cummins fuel pump wiring diagram. This shows how improved the wiring is over stock by reducing the voltage drop to the pump by a significant amount. Discussion starter 1 jun 26 2012.
Joined feb 27 2010 498 posts. Jump to latest follow. Jump to latest follow 1 11 of 11 posts. Installing a dedicated voltage supply line for your fuel pump. This wire runs the electric fuel pump while the engine is cranking. A wiring diagram is a streamlined standard pictorial depiction of an electrical circuit.
Gallery of Wiring Fuel Pump Gen2
