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 MANUALSMERCURY1991COUGAR LS, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ANALOGTESTINGINDICATOR WARNING LIGHTSLOW FUEL INDICATOR
1991 Mercury Cougar LS, 3.8 4
Low Fuel Indicator
1991 Mercury Cougar LS, 3.8 4SECTION Low Fuel Indicator
- When ignition is turned on, ISO fuel pump indicator should come on if fuel level is less than 1/4 tank. Otherwise indicator should remain off. If indicator light comes on with more than 1/4 tank of fuel, turn ignition off.
- Disconnect fuel sending unit connection at tank. Install a 56-ohm resistor between harness connector Yellow/White wire terminal and ground. Turn ignition to RUN position and wait 2 minutes. Fuel gauge should read about 1/4 tank. Check indicator light.
- If indicator light is off, replace anti-slosh module mounted to rear of instrument cluster. If light is on, turn ignition off. Replace 56-ohm resistor with a 33-ohm resistor. Turn ignition to RUN position and wait 2 minutes. Fuel gauge should read about 1/8 - 1/4 tank. Check indicator light.
- If indicator light is off, replace anti-slosh module mounted to rear of instrument cluster. If indicator is on and fuel gauge reads approximately 1/8-1/4 tank, fuel gauge and anti-slosh module are okay. Check fuel tank sending unit for intermittent fault.
- If indicator is on and fuel gauge indicates more than 1/4 tank, check operation of fuel gauge. See FUEL GAUGE INOPERATIVE under GAUGES.
NOTE:
Magnetic-type gauges DO NOT
require an Instrument Voltage Regulator (IVR). There is no adjustment, calibration or maintenance required for these gauges. If gauge replacement is required, replace complete gauge unit.
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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.