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I got a walbro 255lph fuel pump off ebay, mines an external inline but they make in tank pumps also.. i got this pump to supply my LS1 @ 58 psi, so it should be more than enough to supply your TPI @ 45psi.
yep, get the part number, then go with Jim here or gmpartsdirect.com to save money.
This was asked about before, the TPI pump puts out fairly high pressure, but isn't this for a Vortec engine swap? I thought Vortec engines needed 60PSI? The TPI pumps don't put out that much.