PeachParts Mercedes-Benz Forum - View Single Post - What is that device before the lift pump?

lrg · #3 01-29-2008, 02:44 AM

I agree, you're describing the fuel heater.

Yes it could be leaking but it's as likely to be leaking fuel out as air in. If you don't see some fuel leaks around the fuel heater then the air leak is likely elsewhere. There are a couple of rubber O-rings inside the heater that can be replaced but you'll probably need to get them from the dealer to be sure you get the right ones.