For priming purposes only a diaphram style electric pump has more suction to self prime the fuel system versus most vane style pumps. A vane style pump back at the tank in series with the mechanical pump both primes and increase performance with the smaller fuel line. But after the car sits often you have to crank over the engine some for the mechanical to prime the electric pump in the back. It varies depending on where you locate the pump at the back of the tank. A Robbmc 550 with 3/8” lines is about a 450HP setup, for cars that are able to hook up off the line they don’t keep up really well, the 550 Robbmc even with 1/2” lines is really not overkill if your making much power.
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