Repairs what should the fuel pump vacuum be for a kawaski v-twin on a johndeere 345

I have a johndeere 345 with a Kawasaki v-twin with a mechanical fuel pump. This mower acts like at times it's running out of fuel. I found the fuel line between the pump and fuel filter mostly collapsed and replaced it, not it, then noticed the fuel filter was not full and it looked like the fuel was siphoning into and though the filter. This is what brings me to the question how many inces of vacuum should the fuel pump pull, at present this one pulls about 13 is this enough ?

Repairs what should the fuel pump vacuum be for a kawaski v-twin on a johndeere 345