i just got the Walbro 255 lph pump from racetronix (just the pump assembly) and i was wondering what kind of voltage the pump will see without the booster wiring harness. i noticed the pump is rated at 13.5 volts, but is that the stock voltage at the pump or the voltage with the plug and play harness?

 

this sould tell you everything you wanted to know and why.

http://www.racetronix.com/Racetronix..._Pump_Kit.html