That is pretty wild that the pump is already bad. I have not seen that from the 450s. The 255s didn't have the best reputation.. but the 450s, so far from what I have seen, have been very reliable. I have tried to deal with Walbros warranty before and discovered that they do not really honor it.
The relay kit will be a good idea. The stock wiring gets incredible hot to the touch running that pump... I know because I did it for a long time (made 670+ whp and ran 11.2s with a 450 on stock wiring). Its not ideal and it definitely needs to be upgraded but it would be odd for the stock wiring to prevent you from getting out of the driveway the first time. If you tried connecting the pump directly and it doesnt spin, I think you just got a dud.
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