1984 280 SEL M110 Fuel Injection
 

I need some help identifying a disconnected hose assembly. I found a hose/assembly not connected on the fuel injection unit for my M110 twin cam engine. The hose is connected to the supply or return line (not sure which line is supply or return) with a banjo fitting then a short hose to an electronic injector (it has a wire and plug connection attached) after the injector is another hose with an 1/8 line to another banjo connector. I can't find any place to connect the banjo fitting. The car seems to run fine (after I replace the water pump) but I would like to know where the line should be connected and what it is for. I am afraid if I leave it hanging not connected it could potentially leak gas and start a fire.
Thanks

Sounds like the type of frequency valve added to the control pressure circuit for lambda control on a grey market conversion.

Most of the ones I see are just going along for the ride (the electrical is disconnected). Not sure how one end coud be disconnected but I suppose the injector would plug it from the return. I'd get rid of it.