You mean like a shutoff valve?
IIRC, the Ford Escort Diesel had one fitted, the mark three versions. I thought there was a citroen with one fitted as well, but I don't recall which one.
My mistake, I believe what you are looking for is called an overrun valve, more likely to be fitted to a petrol, with early injection system on it.
Guess what? I can't find one either............
I give up, its not called an over run valve either, that's something entirely different.
I'm sure there was an electronic control valve in the fuel line on older diesel Escorts.
For all the use this my post is, I may as well delete it......
