General Information

Water contamination in the fuel system may cause driveability conditions such as hesitation, stalling, no start, sporadic misfires as well as causing a misfire at a single cylinder caused by water pooling near a single injector, usually at the lowest point in the fuel rail in some fuel systems. Once enough water has collected in this area it is possible for the injector to receive a shot of water causing an intermittent misfire in that cylinder.

Alcohol concentrations more than 10 percent in fuel can be detrimental to fuel system components and may cause driveability problems such as hesitation, lack of power, stall, no start, etc.

The problems may be due to fuel system corrosion and subsequent fuel filter plugging, deterioration of rubber components, and/or air-fuel mixture leaning. Various types and concentrations of alcohol are used in commercial fuel. Some alcohol is more detrimental to fuel system components than others. If an excessive amount of alcohol in the fuel is suspected as the cause of a driveability condition.