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Re: 1990 toyota 4 runner smelling gas.
Thank you for allowing me to assist you with your problem.
My experience with this particular issue leads me to believe that you probably have a rusted fuel line or lines at the top of the fuel tank, assuming that the fuel lines are OK under the vehicle. This is a very common problem. There is a bracket there that holds the fuel pump inside the tank, and the fuel lines that are welded to the top of this device are wont to develop pin-holes over time and age. Very noticable when driving, most likely the line going to the engine is the culprit. Get under the vehicle and see if there is wetness at the top of the tank. If so, you will need to drop the fuel tank and replace the fuel pump bracket. I hope that this helps you solve your problem.
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If you cannot find a leak then it is probably running too rich if you are also having a rough start and or rough idle. You can find out if it has been running too rich by checking any one of your spark plugs...it will be coated with a lustrous black residue and/or smell like gas. At that point you will have to change them.
You can also try replacing your PCV, a clogged PCV can also allow that type of smell to escape past it's grommet into the engine bay instead of recirculating it back into the system.
Since you didnt notice any change in the performance of your engine, ill presume there's nothing wrong with your fuel injectors.
look for moisture around your gas tank cap, the hose and clamps going down the tank, around the fuel gauge sending unit of your tank. have your fuel line checked from the tank to your fuel injection pump, give particular importance around the connections of your fuel filter, fuel pump, and the return hose from your fuel injection going back to your tank.
Diesel do emit strong hazardous odors that may stick on carpets inside your car.