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my car smells like i have a petrol leak when i turn it on but have no leak underneath the car
It is possible that a car can smell like gas when the heater is turned on for a few reasons. One possible reason that this happens could be a leak in the line.
There are a few reasons why your car might smell like fish. Fish could have been at one point stored in the car.
Cats spraying your car with urine.
Leaking heater core
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.
It probably has a leak, possibly from the heater core.
look for a leaky fuel line
Car exhaust can smell like rotten eggs when the fuel has a lot of sulphur in it.
Your car will not neccessarily smell like Antifreeze if your water pump is going, in my personal experience it sounds like your HEATER CORE is shot. That is what usually makes that smell, unless you spilled some on the engine. Also, if the water pump was going the car would run hot and/or overheat.
A car may smell like sweat due to gym clothes, or other workout clothes, being left in the car.
You might have an oil leak that gets on to the exhaust manifold. Check the gasket around the upper part of the engine.