Installing new water separatar fuel filter

I'm installing a new water separator fuel filter kit on my boat and picking up the fittings today for it. Just wondering what size is standard, if there is a standard size, on the fuel line from the tank to the motor so I can pick up the fittings today without making any extra trips. Also, I have an added small plastic In-Line filter just before the fuel pump I'm taking out that started leaking and I need that hose size to get it spliced back ( that line I think is 1/4" or 5/16"). The motor is a '98 pro v 150. Any help would be appreciated.