fuel problem when tank is half full

Another casualty of the repair work. Should not have used the trailing arm for a temporary jack stand position.
But the bent one was not difficult to replace, and cost about $ 50 for the part. Also finally got around to installing new lift struts for the trunk. The new ones are way better.

No a leaking gas tank is not considered normal, if liquid gas can escape than gas vapors can escape, both are mild fire hazards.

All hoses, fittings and connections to the fuel tank should be clamped sealed and hold pressure.
It sounds like fuel is leaking out one of the EVAP (Fuel vapor valves) seals or the sending unit seal on the top of the tank.

Looking at the picture of your tank:

Based on this picture it does not look to be the rear Evap or the dirt around it would be cleaned away by fuel.


In this picture it possibly looks like fuel has leaked or ran around the front evap and leaked down the front of the tank, did it come from the Evap seal or sending unit?

The check valve line does not connect directly to the tank it connect to one of the ports on the filler assembly.
If you put multiple WSM pages together you can decipher how the hoses are run and where they go.


1- Location of charcoal canister


2- Operation of check valve

So both fuel vapor valves connect together and pass through the check valve on the way to the charcoal canister, but both vapor valves connect to the fuel filler assembly.

2B - simplified view:


3- Fuel lines and tank hose routing:


3B - Same:

(Engineers should be forced to assemble and work on the crap they design, bet the system would have far less components and function the same if they where.)

So in this complicated and mildly hard to follow diagram we can see that the filler assembly has 5 fittings,
1 the main fill pipe
2 the pressure port (connects to the yellow elbow on the tank and sends air/fumes into the filler neck to keep fuel being pumped in from building pressure and shutting off the pump nozzle.
3 & 4 both fuel vapor valves
5 the check valve that runs back to the charcoal canister.

Based on images 2B and 3B the fuel vapor valves join together in the filler assembly piping and come out port A in image 3B.

I just received the new grommets and valve for EVAP system. They are clearly shown on the fuel tank also....but they only fit inside that larger opening. Is that larger opening just part of the fuel tank.....or is that another part that could be replaced ?