I have taken car to dealer and they do not see any leaks. I don’t think they check the top of the gas tank but all gas lines and seals are OK. The smell is raw gas and not unburned fuel from the exhaust. Problem seem worse after car is filled, but just happen again when the car was at 3/4 full.
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2008 Buick Lucerne Question: Strong fuel vapor smell after car is turned off and stored inside garage
SOUNDS LIKE THE SENDING UNIT OR FILLER NECK IS LEAKING. YOU NEED TO HAVE BOTH CK'D VERY SOON THIS IS DANGEROUS
Replyfishy1413, March 08, 2012, 13:32Rookie
Filler neck has been checked but not sure about sending unit and there are no visible leaks under the car. It’s got to be coming from somewhere on top of the tank but not sure what or where. The gas tank has not been removed yet.
Replyglobalhelper, March 09, 2012, 05:43Master
the sender is on top and vapor will smell bad if its leaking and more so full
Answer #2javelin11 May 05, 2013, 13:15Rookie
I HAD A STRONG RAW FUEL SMELL, THE TECHNICIAN INSPECTED THE GAS LINES AND FOUND THE GAS LINE AND THE PRESSURE LINE BOTH ROTTEN AND LEAKING AT THE FIRE WALL BEND AT THE REAR OF THE ENGINE. I CONSIDER THIS A REAL DANGEROUS SAFETY HAZARD AND COULD RESULT IN A CASUALTY. THE DEALER POOED-POOED THE MATTER AND SAID IT WAS PROBALLY CAUSED BY BEING NEAR THE SALT WATER, MY CAR HAS NEVER BEEN CLOSER THAN A MILE FROM SALT. THE GAS LINES WERE ONLY CORRODED WHERE THEY MAKE THE BEND UP AT THE FIRE WLL, THE REST OT THE LINES ARE FINE.I HAD THE SERVICE TECHNICIAN (NOT BUICK) CUT OUT THE ROTTEN AND CORRODED SECTION TO THE TUNE OF $420.00. HE STATEDTHAT HE HAD NEVER SEEN SO MUCH RUST AND COROSSION BEFORE ON ANY RECENTLY NEW CAR. THE CAR WAS JUST RECENTLY OUT 0F WARRANTY AND HAS ONLY 17000 MILES ON IT. WHAT DO YOU THINK OF A RECALL? ANY ONE ELSE OUT THERE WITH A SIMILIAR PROBLEM WITH THEIR 2008 LUCERNE ? BETTER CHECK IT OUT BEFORE A FIRE ERUPTS. JAVELIN 11
Answer #3willybilly June 12, 2013, 19:47Rookie
Open the trunk, pull back the trunk floor mat from the rear of the trunk on the right side. You will see an access plate with 5 small hex head screws holding it on. Remove the access plate and you will see the top of the fuel pump assembly which is sealed inside the gas tank. Examine the top of the fuel pump assembly for any sign of gas seepage.
Note that the access plate is made of very lightweight aluminum and can be easily caved in by heavy luggage or weight resting on it. This puts pressure on the plastic gas line insert to the top of the fuel pump and can cause a stress fracture which will in time get worse and cause a very large fuel leak. This happened to my 2008 Buick Lucerne. The procedure for replacing the fuel pump assembly is fairly simple. I paid $300 for the AC/Delco pump assembly and transferred the fuel level sending unit from the old unit to the new one. Instructions require a J-tool to remove the locking ring which holds the pump in the tank. I used a small chisel and hammer to tap the ring loose. Just hit it alternately on both sides to loosen it. When taking the pump out of the tank, pull out the fuel level float which is attached via a rod to the sending unit. No fun fishing that out of the tank if it drops in. The fuel line comes off with just a squeeze and pull from the top of the pump assembly. Saved $400 and cost of a tow instead of a dealer or garage fix.