Pay Attention to These Sure Signs of a Clogged Fuel Filter Mar 21, 2018Every vehicle has a fuel filter, whether it uses gasoline or diesel as fuel. As the name suggests, it is the fuel filter which cleans the fuel before it makes its way into the engine. At some time or the other, fuel filters show signs of wearing out. You need to be alert to understand the signs and quickly attend to it.Author: Bhakti Satalkar Symptoms of a Clogged Fuel Filter in a Diesel Car | It The symptoms of a clogged fuel filter in a diesel car show up in the way an automobile starts or runs during acceleration. The fuel filter is a fuel system component through which diesel fuel passes, cleaning debris from the fuel and trapping it inside or by the fuel filter.