How to get EC2 instance to access internet facing Network Loadbalancer.

I have a EC2 on a subnet with a NAT interface. I need it to access out internet facing load balancer within the same VPC. I have added the EIP assigned to the NAT Gateway to the SG assigned to the EC2's behind the ELB.
When I make a wget request I get connected but then receive 'HTTP request sent, awaiting response... No data received.'

How can I get this to work?