You guys that put aftermarket pumps on your bikes be sure and put at least a 20amp fuse in the fuel pump circuit. In the fuse block/box.
Or use a relay with larger wiring so the stock puny wiring isn't causing a significant voltage drop.
Relay, relay, relay .....The OEM wiring is no where near the gauge to supply the amperage needed for a big a$$ pump.
Some people still use the factory wiring and it functions, but there is still a large voltage drop.
Anyone who uses the stock wiring try this test. Lift your tank or wherever you have the pump.
Turn on the key and kill switch for the pump to prime and listen to the sound of the pump.
Now make a jumper wire directly from the battery negative to the pump negative terminal
Run a wire from teh battery positive to the positive pump terminal but don't connect it.
Turn on the key and hit the kill switch to prime the pump again.
Touch the positive wire to the pump halfway through the prime cycle and listen to the pump
The sound of the pump speeding up is because of the voltage drop.
