I'm in the process of overhauling / turbocharging a 6.2L diesel for my truck to replace the gas 350 it has right now. My question is with regards to the fuel system. The engine uses a mechanical lift pump stock, but I'd prefer to use an electric pump if possible.

My truck has a TBI in-tank pump, which produces way more pressure than the 6 PSI that the mechanical pump produces. Is there any reason in specific why a guy couldn't feed the injection pump with a higher initial pressure using the TBI pump as a lift pump? I understand that GM uses an inline electric pump for the 6.5L pumps, so there must be some reason why they didn't just use an in-tank pump...

Thanks!

Russ