I would suggest using a Honda TRX500 Rancher (four wheeler) fuel pump.
I've used the Rancher fuel pump on two fuel injection conversion projects, my 2005 Kawasaki EX250 and my 1993 Suzuki GSF400 Bandit. The TRX pump is a great product and surprisingly cheap to buy from the major parts suppliers.
Here it is mounted in my Suzuki GSF400 during an early stage of the build: