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All the posts shown are good. You might want to check this one.
On my car 1983 240T, it was (twice) the fuel filler pipe itself. The opening gets out of round and the filler cap will leak (vent) gas back into the car.
I replaced just about everything.
1. Bung nut and rubber gasket(the dealer does not call this part a bung nut). They thought I was crazy until I showed them a picture of it. I believe it is called a locking ring.
2. Fuel return line.
3. Fuel lines (two) from in-tank pump
4. Fuel line from main pump to fuel filter including fittings.
5. Fuel cap
6. In-Tank pre-pump including new rubber line connected to pump and filter sock.
7. Fuel Filter and finally,
8. Fuel Filler pipe and new rubber seals. (no more smell).
I created all new curse words.
Check your filler pipe. See if it is out of round. Take the rubber gasket off your fuel cap and see if it covers the filler pipe opening exactly. If not, there it is. I actually dropped the tank (not hard) and removed the filler pipe. Put the fuel cap on and blew (while blocking the fuel vent line opening from the bottom. Air was escaping from the fuel cap. When I replaced the filler pipe and did this again. I got not air escaping at all.
I should have thought of this first.
Have fun.
Lawren
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