If you are going to use your car in competition with an electric pump then, according to CAMS, you will need to have some form of cut out so that in case of a crash the fuel pump stops if the engine isn't running. CAMS don't want fuel being pumped over hot exhausts of shorting electrics.
In my case the pump is hooked up via the oil pressure sender - no oil pressure no pump. Not strictly by the recomendations but it works. CAMS suggests using a cut off swith (impact sensor??) from a LPG vehicle to do this.
Then again, I have not been required to prove that I have complied yet..........
On the pump side, I am running a Facet pump under the boot floor to feed my twin aisans with no return line. Tried a Holley Red a long time ago and pissed it off as it kept starving for fuel. The car would just stop until I sucked fuel through the system. After this I went back to a Facet.