Soldering or open barrel splice in the fuel tank?

Hi everyone!

Yet another one "sanity check" question. :)

I'm installing AEM fuel pump and I need to replace the stock wiring with AEM connector. I've seen dozens of youtube guides and everyone solders connectors to stock wires. I planned to make open barrel splices but now wondering if I'm wrong. If still splice, what prefer splice size should I use?

Another question is: should I keep the stock capacitor between the pump positive lead and ground? I prefer to skip it (less joints - more calmness), but maybe it is more important than I think.

Thanks!