201 190D 2.5 - 1986 to 1991 300D 300TD 300SDL 350SD 350SDL - 1990 to 1993 300D 2.5
This is the new Bosch plastic upgrade to replace the old metal style fuel stop solenoid or shutoff valve. This is located on the top rear section of the injection pump (right under the intake manifold). Sorry, no instructions included but it is a straight forward replacement.
Later 60x Aluminum Head Diesel Injection Pump Shutoff Valve
$52.75
SKU:
DSL-COM60XFSV 
Product Details
If your engine is slow to or will not shutoff with your key, then there is a good chance this valve has gone bad. To test for proper operation, attach a vacuum hand pump tester to the valve inlet nipple. If the valve will not hold steady vacuum pressure it will need to be replaced.