tvs1900--is existing fuel pump enough? 2008 Ava 5.3 non flexfuel.
 

Installing Roush 1900 tvs on 2008 avalanche. 5.3 liter, non-flex fuel engine.

Was looking at boost a pump or magnavolt, but have decided to go via walbro pump upgrade.

Before going through the pain of dropping the tank to install the upgraded pump, does the existing OEM pump already have enough capacity? Roush kit includes 42lb/hr injector upgrade.

Do I really need to upgrade the fuel pump?

What are others with the 5.3 non-flex fuel GENIV's doing?

Stock fuel pump will be fine.