Only one of these is available. This unit was only mounted on a diesel engine for about 3000 miles. If your diesel engine is starting to shut off very slowly, or not at all, it may be time to replace the vacuum fuel shutoff valve at the rear of the injection pump. You can check its operation with a hand vacuum pump, or you can pull the rubber hose off the back for visual inspection. If you see black oil in the hose, it's time to replace the valve (the diaphragm has started to leak). It is a tight squeeze to remove it but not a difficult job for the do-it-yourselfer. You will be amazed at how nice it is to have the engine shut right off again right after turning the key off.
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PLEASE NOTE: If your engine will not shut off, the problem may not necessarily be this shutoff valve. You could have a bad vacuum pump or leaks elsewhere in the system. I have two resources to help you troubleshoot this problem properly BEFORE you start purchasing parts.
Related Products:
Diesel 616 617 Vacuum Source Troubleshooting and Repair - by Kent Bergsma
Applies to 240D 300D 300CD 300TD 300SD Diesel This guide is written specifically for owners of 123 and 126 diesels from 1977 up to 1984. There are some sections that apply to the 115 and 116 chassis but it is not specific to those models.
Service: Vacuum Hand Pump Testing Kit w/ Extras