Why do I smell gasoline?

Could very possibly be plastic evap lines, charcoal canister, purge vent valve and fuel filler gasket are all more reasonable options. That is where your gas tank is so you may have a hole somewhere in the top and that's why you get the odor but no leak. If u fill it up to the top and drive it and then check it may show where the leak is. I don't recommend doing this because it will leak fuel. The next option is take down the tank and visually inspect it.

First, remember that any fuel leak is potentially dangerous.

Now, it could be a residual smell from the fuel that leaked, but there still could be a leak. What I suggest is to check fuel pump pressure, and then check to see how quickly the pressure drops off when the key is turned off. The system should maintain pressure. If it drops off qiuckly, then chances are you still have a leak.

Here is a how to for checking:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find. Also, if you need a pressure gauge, most parts stores will lend or rent them.

Joe

Fill the tank with gas, notice if the smell is worse with a full tank or an almost empty tank. If there is any difference in the smell then its probably a leaking gas tank. My 98 tahoe's tank leaked where the tank halves were welded by the filler hose. It was hard to find. Look around where the filler hose connects to the tank.

Ok, take the air cleaner off and look behind the throttle body where the fuel lines connect, there are two connections. Start the engine or jump out the fuel pump to pressurize the lines and see if fuel is leaking out from there. If so, very very very carefully take the fuel lines off, use a wrench to hold back the fitting that goes in the throttle body or you will kink the line and it may break. Spray some penetrating oil on these lines first--you'll see. Then, take the fittings out of the throttle and you will see two flat teflon washers. Replace these washers with ones from the dealer not after market--trust me here too.
I've also seen the fuel lines rust away where they go down behind the motor. If this is the case-- I would not disturb the fuel lines at the throttle body at all. I would buy some fuel injection hose and clamps (important to use hose and clamps designed for fuel injection because it's under high pressure) be sure it's the right size, and fix it that way. Be aware that fuel injection hose is more expensive than regular fuel line and a lot stronger. I've seen guys use regular fuel line to fix a fuel injected line and about a week later they were shopping for a new truck because the line blew up like a balloon and burst all over the distributer cap. BABOOM good luck be carefull! Let me know how you make out

I forgot, if the fuel connections in the back of the throttle body are the problem, replace the o-rings on the fuel lines also. Rember DO NOT KINK THOSE FUEL LINES they kink very easy.

Hello,

This actually has happened to before. In my case it was a fuel line going to my fuel filter that had a hose clamp back off on it. The fuel was leaking from the hose and was dripping on top of the fuel tank and running down the side and showing on the bottom of the fuel tank. Another possible cause could be the fuel filler neck. There is usually a gasket on the fuel tank where the neck goes into the tank at. Sometimes the gasket wears out and it leaks fuel from there. Check all lines and the around the filler neck for leaks. If not there follow the fuel line. The leak should be readily apparent and if it has been leaking for awhile, it will be "washed out" there. Get back to us with what you find out.

Thanks,
Alex
2CarPros

Hello again,

Yes. If the dripping is coming from the bottom than I would say that yes, the fuel tank is compromised. But to be absolutely sure, I have included instructions on removal and installation of the fuel tank, testing the fuel tank for leaks, and Technical Service Bulletin (TSB) from GM that you may or may not be interested in, down below in the diagrams. Please go through this information and get back to us with what you find out.

Thanks,
Alex
2CarPros