Amazon.com Inc. said Wednesday that it will add a 5% fuel and inflation surcharge on sellers using its fulfillment and delivery services, the first time in the company's history it has imposed a fuel levy. In a memo to sellers, the Seattle-based e-tailer (NASDAQ: AMZN) said the surcharge, which goes into effect April 28, will be levied on top of the per-unit rates charged under its Fulfillment by Amazon service.