Technically should be ok if the regulator
and return line can dump the extra fuel. Any kink in the return line maybe ok running factory type pump but choke on extra flow from high volume pump. You need to watch fuel pressure.
Dead F pump maybe a symptom of iffy wiring etc. If not fix then any new pump will die and likely soon.
See my Cave,
Electric MotorsF pump will also die from running out of gas or block flow anywhere in the system. Fuel flow is lube and coolant for the pump.
"Quantum 255 LPH" is made by who? Are you Sure?
If/When buying important parts from Ebay Amazon Wish and other vendors online... Most Big names are often counterfeit. Off brands are often far worse and doesn't last long. Ebay and Amazon know they're crap but because they get huge fees hiding behind "Safe Harbor" doesn't care until gets a take down notice by a Brand for a given vendor that pops up again and soon under a new name. Most crap never gets taking down and in Amazon's case will inventory and ship the crap to get more money from a vendor. (Item will say "Sold by X, fulfilled by Amazon.")
Like your "cheap ebay fuel pressure regulator" that's cheap for a reason and may burn you and the car with no warning in a few days, weeks or months. I won't trust that on a go-cart.
Then add many "performance" parts of any type are really crap for a street car like Blacktree said.
A long same lines as an example: Brake parts have many "performance upgrades" that are crap and/or illegal for use on the street.
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave