Originally Posted by JRems
It won't be too much an issue. Just make sure your inlet is not restricted. I use a lg 5 series pump, basically the same size as your march ( 1" inlet 1/2" outlet) and I don't have an issue. Just don't restrict it right at the inlet with a reducing bushing. I used a 1" to 3/4" elbow and then a 3/4 to 1/2" adapter with a camlock.
Do you remember where you got the 3/4" to 1" elbow? They are not stocked at the local hardware store, and i'm having trouble finding them online. *edit* in 1" male to 3/4'" female