Andy, I won't say it can't happen. But remember. There is a filter sreeen on the fuel tank side of the pump. Think about it, how would anything large enough to stop up the fuel system get thru the screen. Bosch says it, filters a about 60 microns on the newer ones. When I took my screen off and was looking for any thing in the tank, I found the glue off clear cover that they put on the pumps in one corner of the tank and water. Both together was about 1/4 cup. Being that the water and glue were both bunched up together, they wouldn't go thru the small holes of the baffel, much less the screen. Just something to think about before you go thru the long process of cleaning hoses. John Hervey www.specialTauto.com