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You have a 1998 gmc jimmy and when you start my car it smells like gas really bad?

Here are some possible reasons why your 1998 GMC Jimmy smells like gas when you start it:

1. Fuel injector leak: A faulty fuel injector can cause excess fuel to leak into the engine, leading to a strong gasoline smell.

2. Faulty fuel pressure regulator: A malfunctioning fuel pressure regulator can cause the fuel pressure to be too high, leading to fuel leaks and a gas smell.

3. Loose or damaged fuel lines: Loose or damaged fuel lines can allow fuel to leak, causing a noticeable gasoline odor.

4. Leaking fuel tank: A leak in the fuel tank or its components, such as the fuel filler neck or sending unit, can lead to fuel fumes escaping into the air.

5. Clogged fuel filter: A clogged fuel filter can restrict fuel flow, causing the engine to run rich and producing a strong fuel smell.

6. Malfunctioning evaporative emissions control system: The evaporative emissions control system prevents fuel vapors from escaping into the atmosphere. A malfunction in this system, such as a faulty purge valve or canister, can cause a gas smell.

7. Catalytic converter issues: A damaged or clogged catalytic converter can cause incomplete combustion of fuel, leading to a strong exhaust smell that may include a gasoline odor.

8. Engine misfires: Misfires can occur when the spark plugs, ignition coils, or fuel injectors malfunction, causing unburned fuel to enter the exhaust system and create a gas smell.

9. Leaking exhaust system: A hole or leak in the exhaust system can allow exhaust fumes, including gasoline vapors, to escape into the passenger cabin.

10. Other engine issues: Other mechanical problems, such as a faulty oxygen sensor or a bad head gasket, can also cause a gas smell in the vehicle.

If you notice a strong gasoline smell in your vehicle, it's important to have it diagnosed and repaired by a qualified mechanic to prevent potential safety risks and further damage to your vehicle.