Originally Posted by
bad383ta
Quick question what is the limit on a 2012 Silverado 5.3 Flex Fuel, fuel pump. I am assuming its 250lph to keep up with E85 and good for 550-600 at the wheels. This Silverado has a Whipple Supercharger and ZR1 Injectors. I am hitting 100% DC on the injectors at 6100rpms with only 8psi and fuel pressure is dropping to 47-48psi. Knowing the injectors, I figured the fuel pump was way smaller and installed an MSD boost a pump. I now have 18 volts going into the FPCM at WOT, However I only have 10.5volts coming out of the FPCM. I have installed many MSD BAP setups on other trucks, Camaros, vets and always had great results. I know the BAP is working but I have no voltage change on the pump side of the FPCM regardless of BAP or no BAP the most I am seeing is 10.5V. I have no dtc codes but the FPCM seems to be limiting voltage way below even factory voltage limits. Any thoughts?
Bad383TA