Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Alcohol-In-Fuel Testing: Notes
TOOLS REQUIRED
- SA9213NE Saturn Service Fuel Test Kit
Certain driveability complaints such as hesitation, lack of power, stall, no start, etc. may be caused by an excessive amount of alcohol-in-fuel. The complaints may be due to fuel system corrosion and subsequent fuel filter plugging, deterioration of rubber components such as internal fuel pump module o-rings and/or air-fuel mixture leaning effects.
Various types and concentrations of alcohols are used in commercial gasoline. Some alcohols are more damaging to fuel system components than others. If an excessive amount of alcohol in the fuel is suspected as the cause of a driveability condition, the following procedure may be used to detect the presence of alcohol in the fuel. In this procedure, water is used to extract the alcohol from the fuel. However, the specific type of alcohol is not determined.
The fuel sample should be drawn from the bottom part of tank so that any water, if already present, can be detected. The sample should be bright and clear. If sample appears cloudy or contaminated with water as indicated by a water layer on the bottom part of sample, this procedure should not be used. The entire test should be repeated at least twice. The fuel system should then be cleaned. Refer to FUEL SYSTEM CLEANING .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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