Lisle offers their 35000 Fuel Filter Disconnect tool for GM Flex Fuel Systems. Applications include disconnecting the fuel line from the fuel filter on 5.3-liter Suburbans, Tahoes, Yukons, Avalanches and select Silverados and Sierras. The tool works by inserting the 2 semicircular disconnects into the coupling. The handle is then connected and depressed to separate the fuel line from the filter.