help the noob with a code please

hey all need some help my ecu is throwing code 43 at me i know its a fuel supply system code but my question is where should i start to look on fixing this code im getting the lamest gas mileage you guys have ever seen
250kms to a tank maybe 300kms if i take it slow
oh running a D15b vtec completely stock please
250kms to a tank maybe 300kms if i take it slow
oh running a D15b vtec completely stock please