Do I have a Warm up Regulator?

[thorsen]

Does my 1980 280SE have a WUR? If I do, I can't seem to find it. I believe the item circled in red in the frequency valve, but do I have a WUR?

[79Mercy]

yes you do. it is bolted to the left side of the engine block under the intake.

[thorsen]

Right by the oil filter. I see it now - thanks!

[thorsen]

Oops, it looks like I'm missing the vacuum hose, and I'm guessing it's been off for a while. Do you agree there should be a hose there?

[thorsen]

According to the operation diagram in 14-050 there is no hose there. There are two hoses on the side (which I do have).

This is rather confusing. Which is correct?

[Gurunutkins]

I have a 78 with WUR and on that there are the fuel in and fuel out hoses and an open port that looks like it should have a vacuum line but is actually just an open port to allow for barometric pressure equalization. the WUR uses external pressure versus vacuum and temperature to adjust the pressure of the fuel during warm up
cheers
Barri