If it's leaking vacuum it can and will affect the boost which would cause a
drop in mileage
Sent from my iPhone
> On Sep 12, 2017, at 10:06 AM, Larry Turner via Mercedes
> wrote:
>
> Had the fuel shut off valve replaced recently and over the past couple of
> months
Had the fuel shut off valve replaced recently and over the past couple
of months following the shut off valve failing (it was a slow process)
we had seen our fuel mileage go down with every fill up. Filled up
today and the mpg is back to 32 and change - where it used to be all the
time/ The