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I'm running a Walbro 450 in my truck. They seem to be the go to fuel pump for a lot of GM people.

Will you be adding a Flex fuel sensor? I know it probably won't gain anything on a N/A vehicle, but it seems you like to tinker.

I do like to tinker, but the nearest E85 station is 30 minutes away. So that's probably the only thing that I won't be tinkering with.