I had a fuel odor in my cobalt and after lowering the fuel tank i found one of the fuel lines coming out of the tank was cracked, while removing the fuel pump both of them snapped right off. way too brittle but a new pump and sending unit (all one assembily) fixed it right up with minimal difficulty and only $250.00.
hope this helps
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If you have a strong gasoline smell, get that car into a mechanic ASAP. Forget fooling around trying to discover the problem yourself. Gas explodes, right? You already have a strong smell. That means that somewhere down the fuel system line there is an active leak and that is dangerous. The fact you have to post here means you don't know anything about a car, so stop messing around with a potential lethal problem. I am an old alley mechanic from wayyyyy back and am speaking from experience.
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
SMELL GAS YOU NEED CHECK ALL FUEL LINES UNDER THE HOOD IN THE ENGINE COMPARTMENT.IF GAS IS STRONG UNDER HOOD YOU DONT SEE LEAKING FUEL LINES.YOUR FUEL RAIL FUEL INJECTORS LEAKING OR FUEL PRESSURE REGULATOR O - RING OR DIAPHRAM LEAKING GAS.IF FIND NO LEAKS UNDER THE HOOD CHECK FUEL LINES UNDER CAR FROM ENGINE TO FUEL TANK FOR LEAKS.IF ALL IS GOOD YOUR EVAPORATIVE CANISTER SOAKED WITH GAS OR YOUR EMISSION EVAPORATIVE SYSTEM NOT WORKING. DEALERSHIP HAS TO CHECK AND FIX.
Look in the back of the car. The fuel pump lines like to break. You will not be able to see them, but you will smell and see that the fuel tank is wet. Call your local dealership, have you vin # and milage, ask them if it's covered by warrenty.
I had an old chevy truck that was carbureted with a mechanical fuel pump. I drove for months with the same fuel smell. It ended up being a small hole in the pump itself, on the side of the engine. It evaporated too quickly from the hot engine temperature to catch. hope maybe that might help if you have a mechanical pump.
You more than probably have a gas leak somewhere in the fuel system. If you can smell gasoline, it is leaking somewhere. The lines run along the frame to the engine. The leak might be hard to see or hidden (on top of the fuel tank).
The leak is robbing fuel pressure from the engine, causing it to idle rough, so is probably on the pressure side of the system.
(Most fuel systems, except for "returnless" systems with Pulse width modulated fuel pumps (not very common), have a pressure line and a return line to the tank.