I got a sprinter and it has starting problems and i just pulled the fuel tank off and saw there was like a blue valve or something that was just hanging there wondering if anyone has a clue of what it is im guessing its a one way valve but i checked it i can blow in and out which im sure it should not be doing so if anyone can help me i would really appreciate it also heres the part number if that would help its A 638-470-0593.

 

Welcome to DF
What year is your sprinter?

 

Its a 2003