Mechanical fuel pump comparison/opinions/feedback.....?

One of kits said you have to leave the electric pump and it's on pressure switch at 12psi. Do you really have to run a pusher pump with the belt drive?
 
It would be nice to have a pusher for initial prime but my gusher runs off my dual cp3 and has no problem with prime unless u change filters than it can be a ***** some times to prime
 
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