Hi, new member... new to MB. I have found so much good info here, but having a problem with leaking EHA valve... Tried searching.

Noticed gas dripping from EHA valve, went to junk yard and pulled another. I understand these aren't usually problem parts. Well I installed the "new" valve, still leaking....

So I went and bought new O-rings, the little green ones and installed them. Still leaking. Except this time I can see its leaking from the eyelet between the 2 torx bolts that hold the valve on the fuel distributor.


Now, I somehow find it unlikely, though I know its possible, that both valves are crap, but is it possible I have a bad 02 sensor that is causing this leak?

I'm thinking maybe way too much pressure in the fuel system....?

With the old EHA valve installed I unplugged it while car was running, not much of a change except engine seemed starved for fuel after revving past 3000 rpms in park.

I understand if the 02 sensor is working correctly the car would most likely die upon disconnecting the EHA valve...

Can anyone help me, I absolutely must make some headway on this today.



BTW, it's 90 300E around 180,000 miles.

many thanks!!