Regular fpr on the left, mechanical pump driver fpr on the right
The mechanical fuel pumps work on vacuum so they will suck the fuel out of the tank whilst cranking the engine, puts a demand on the battery but I'm using a 16volt battery, as I'm not bothering with an alternator.
Iv seen a few drag cars wire an electrical fuel pump up with the starter motor so that the engine gets fuel pressure faster and as soon as it starts the mechanical pumps take over.
Mechanical pumps are so much better in my opinion as there's no electrical load and wiring to worry about and you should never run out of fuel supply
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