98 E300 Fuel leak at Shutoff valve

[MCallahan]

Hoping to get some ideas. A friend asked me to look at her 98 E300 after a local shop quoted her $1500 to replace the injector pump due to a fuel leak. I went over today and had a look. The leak is obviously coming from the shutoff valve. Appears the valve is leaking through the electrical connector. She said the shop just replaced the valve and O-ring. I am positive the fuel leak is somewhere on the valve, and knowing the leaky EHA symptoms on the gas burners with CIS, I am highly suspect of even a new shutoff valve. I also know it's really easy to nick or pinch an O-ring.

My plan for now is to order a new shutoff valve O-ring and all three plastic lines to the shutoff valve (like $35 worth of parts, so not a huge gamble). If the leak persists, then a new shutoff valve ($160).

Anybody else had to deal with this before I order parts?