Originally Posted by carbongmc

I tried experimenting with a BAP over the last few weeks of the year. The stock fuel pump control module is like a 12v to 12v convertor. You can send 18 volts into it, and if it doesnt fry it after extended periods, it only lets 12v or less come out of it. Its made to drop the voltage sent into it, because the NNBS trucks have varible voltage pumps. Installing the BAP after the FPCM and before the pump makes the BAP constantly blow fuses. The BAP doesnt like trying to boost voltage when only 5 volts is getting sent to it.

Originally Posted by TX Tahoe Z71

Interesting. Are the NBS FF pumps variable voltage as well?

Originally Posted by carbongmc

I dont think they are, but I havent looked into anything for them either. I know they are returnless as is mine, but having 12v going to the pump already, I see it being a little easier to upgrade then a NNBS.

Originally Posted by TX Tahoe Z71

I have return style, but I believe 04 and on are returnless, IIRC