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I would double check that your fuel tank is sealed. Fuel fumes can be very bad for your health and can be very dangerous. Sounds as though the gas line may be leaking, or the fuel pump seal is leaking.
Good thing you passed before the engine light came on. You should mos def get the code from that engine light. If you smell gas you have a leak in the system. Same thing happened to me i had to drop the tank and change the seal around the lid of the fuel pump housing because the smell was coming from under the car and in the car. I also followed my fuel lines and saw some cracks forming so i replaced those and the gas cap for the heck of it. Only $20 for everything but make sure to pull the code first. It reslly makes things easier.
HI. Engine loping at idle in a stock RS camaro will likely be caused by bad fuel injectors. The throttle body on your car has two large injectors and usually the drivers side will short out leaving the passenger side over-working. You can see this occuring if you remove the air cleaner lid and use a very bright flashlight to look at the spray pattern for both injectors. They should look the same roughly. There could be a vacuum leak at the MAP sensor hose, there could also be stuck open EGR valve as well, commonly there is a problem with the Engine Coolant Temperature sensor and wiring connector that may be the cause of your problem. As far as the vapor leak in the fuel system, check the fuel hoses near the gas tank and the smog canister under the hood for cracks or broken places. I have had to replace many fuel pump o-ring seals on these cars though. The spot where the fuel pump hanger mounts into the fuel tank has a large diameter o-ring that cracks and splits very commonly, also if the fuel pump was replaced, sometimes people don't quite get the seal to stay in place just right.
Was fuel smell present before you had fuel pump replaced? If yes I would sugest you drop tank and see if fuel vent hose is plugged forcing fuel back pressure line to vent through cap. If fuel smell was not present before you replaced fuel pump and seal. I would suggest you drop tank back out and check all fittings and hose conections. also if you still have old sending unit you could check to make sure they are exactly the same. As Sometimes you have to pull relief valve from old sending unit and install it in the new one, as some sending units wont have one in it. and some will have one that is regulated at a different fuel pressure. hope this helps Vic
The humming noise is coming from the fuel pump. Its possible its getting ready to fail. These start making noise when they are going bad. The smell can be coming from bad gas cap not sealing up fuel tank properly and or a fuel pump/sending unit seal. You can pull the back seat bottom out easy enough by removing 2 5mm alan screws that secure it to the floor. Remove the seat bottom buy pulling out and remove black cover under seat bottom that has 3 philips screws. you may smell fuel more promanently here.
Hi there, just under the rear seats is where the fuel tank sender unit is and sometimes the seal will leak out strong smell of petrol, you need to remove the rear seats and the sender unit cap and check the seal, may need replacing, hope this helps.