Hello all I am contemplating putting in my modified 07 tahoe fuel pump bucket with a walbro 450 pump installed. It's not a flex fuel vehicle nor a flex fuel bucket. I am wondering if I will have any issues trying to run this walbro 450 pump with the stock regulator, lines, returnless system. I am also wondering if anyone has done it as I am running out of fuel in 3rd gear at 6.5 psi of boost with a boost a pump. I have pics of the modified fuel pump bucket.

 

Update it doesnt work it gives 90+ psi to the rail

 

You need an external regulator.