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Its as simple as pulling the old one off and pushing the new one on. When the engine is off there won't be much if any fuel in them, and there's no pressure. Its just a return/leftover fuel line. They do not affect starting/running. You could run the car without them and it'd run fine, you'd just lose a lot of fuel on the ground....they are just where the leftover fuel travels back to the tank.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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