It could be a bad fuel pressure regulator.
Car exhaust can smell like rotten eggs when the fuel has a lot of sulphur in it.
look for a leaky fuel line
because your engine is going to break down or when you start the car if the whether is cold, it makes it smell like gas
If a car begins to smell like rotten eggs and then starts acting like it has bad gas, it may have been filled with the wrong type of fuel. This smell is common when diesel fuel is burned.
Smelling a gasoline smell when the weather is cold could mean that the gas is set too rich. It would also be possible that the carburetor needs to be checked for a fuel leak.
Typically this is caused when the fuel is burned uncleanly and the sulfur in gas makes it smell
It has a fuel system leak, can be fuel line, etc.( liquid leak) or (fuses) faulty gas cap/fuel emission system leak.
If the fuel injectors are dry then the 1998 Honda Civic may have a gas leak. The car should be inspected, even a pin hole leak can lead to a fatal accident.
exhaust leak or fuel leak
Check your fuel cap or gas tank for leaks, or maybe the gas lines.
It has a fuel system leak, can be fuel line, etc.( liquid leak) or (fuses) faulty gas cap/fuel emission system leak.