Please Help!

[pat q]

My 86 560 Sl just had the EHA valve changed because it was liking gas. Now it won't start at all. I had been having problems starting it for a while. I took it to the mechanic, it ran well after the valve change, I took it on a short trip but, on the way back it started to loose power and hesitate. I got home, tried to start it this morning and later around with no luck. Any ideas what's wrong???
Pat

[maheath]

You would have to test for sure, but it sure sounds like one of your fuel pumps has gone.

But I'd change the fuel filter first, just in case.