Okay someone please, please explain to me how the w124 fuel system works... I just apparently can't get this straight..

So everything was working great except for my fuel sender when I got the car, last month the hose from the tank to pumps started leaking, replaced that and the screen at the bottom of the tank as well as the vent valve. I put the two smaller hoses on the bottom of the tank backwards so I had gasoline shooting out from the engine bay.. Switched them back and put everything back with a vent valve and everything seemed okay. The last few days I noticed my sender was acting really funny, didn't think much of it because it didn't work right to begin with... Went to the junkyard today and pulled a sender off, paid for it and went to put it on to find out it failed completely because the tank collapsed in on itself, the sender isn't in the right position and I need a new tank. Tank I can get..

But I want to know WTF caused this to happen, it seems I cannot get rid of a gas smell to save my life on this car and I've had nothing but problems with this fuel system! Thinking about getting the tank tomorrow I just don't want to put it in then low and behold it does this again... please help...

__________________
2007 BMW 328XI

Tank vent?

__________________

Gone to the dark side

- Jeff

Thanks to a forum member for sending me fuel system diagrams I figured the "vent valve" I had put on under the tank was for the engine bay, I had no idea there was two of them and I didn't have an example of the correct one under the tank cause mine was missing...

I'm guessing it just built up pressure until it collapsed, I'm going today for another tank and the fun task of pulling and replacing... Even with the correct vent valve under the tank I'm a little hesitant to replace it in fear of it doing this again... I just want to be done with my fuel system...I hate gasoline.

__________________
2007 BMW 328XI