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.
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HOMESERVICE MANUALSCHEVROLET1994C 2500 SUBURBAN 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSALCOHOL/CONTAMINANTS-IN-FUEL TESTING PROCEDURE
1994 Chevrolet C 2500 Suburban 2WD V8-350 5.7L
Alcohol/Contaminants-In-Fuel Testing Procedure
1994 Chevrolet C 2500 Suburban 2WD V8-350 5.7LSECTION Alcohol/Contaminants-In-Fuel Testing Procedure
DESCRIPTION
Certain driveability complaints such as hesitation, lack of power, stall, no start, etc. may be caused by an excessive amount of alcohol in the fuel. The complaints may be due to fuel system corrosion and subsequent fuel filter plugging, deterioration of rubber components such as the O-Rings.
Various types and concentrations of alcohols are used in commercial gasoline. Some alcohols are 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, 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 (ethanol or methanol) will not be determined by this procedure.
The fuel sample should be drawn from the bottom of the tank so that any water, if already present, can be detected. The sample should be bright and clear. If the sample appears cloudy or contaminated with water as indicated by a water layer in the bottom of the sample, this procedure should not be used. The fuel system should then be cleaned.
TESTING PROCEDURE:
- Using a 100 ml cylinder with 1 ml graduation marks, fill with fuel to the 90 ml mark.
- Add 10 ml of water to bring the total fluid volume to 100 ml and install a stopper.
- Shake vigorously for 10 to 15 seconds.
- Carefully loosen the stopper and release the pressure.
- Close the stopper and shake vigorously again for 10 to 15 seconds.
- Carefully loosen the stopper to release the pressure.
- Put the graduated cylinder on a level surface for approximately 5 minutes to allow time for adequate liquid separation.
Certain driveability complaints such as hesitation, lack of power, stall, no start, etc. may be caused by an excessive amount of alcohol in the fuel. The complaints may be due to fuel system corrosion and subsequent fuel filter plugging, deterioration of rubber components such as the O-Rings.
Various types and concentrations of alcohols are used in commercial gasoline. Some alcohols are 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, 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 (ethanol or methanol) will not be determined by this procedure.
The fuel sample should be drawn from the bottom of the tank so that any water, if already present, can be detected. The sample should be bright and clear. If the sample appears cloudy or contaminated with water as indicated by a water layer in the bottom of the sample, this procedure should not be used. The fuel system should then be cleaned.
TESTING PROCEDURE:
- Using a 100 ml cylinder with 1 ml graduation marks, fill with fuel to the 90 ml mark.
- Add 10 ml of water to bring the total fluid volume to 100 ml and install a stopper.
- Shake vigorously for 10 to 15 seconds.
- Carefully loosen the stopper and release the pressure.
- Close the stopper and shake vigorously again for 10 to 15 seconds.
- Carefully loosen the stopper to release the pressure.
- Put the graduated cylinder on a level surface for approximately 5 minutes to allow time for adequate liquid separation.
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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.