Quote:
Originally Posted by compu_85
Does fuel lubricity make that much of a difference on a MB? I know it does on a car with a VE pump, but I don't know how much of an inline pump is lubed by the fuel.
When I got my best economy ever in my TDI I was running B15 (56.8 MPG!)
-J
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In Inline Fuel Injection Pumps the Elements/Plungers and Barrels that create the high pressure for the Injectors are lubricated by the Fuel. All the other parts are lubricated by Oil supplied from the Engine or if your Fuel Injection Pump is old enouh you add the Oil to the Fuel Injection Pump yourself and you have to check it ounce in a while for contamination or to maintain the Oil level.
Rotary pumps like used on GM,VW, Volvo and so on are all lubricated completely by the Fuel. They also are sealed by way more O-rings and have seal/s on their drive shafts that some have claimed the new Diesel Fuel has done in.
The Fuel Injection Pum Drive shaft seal on My Volvo started leaking about 1-1/2 years ago. Was it the new diesel or old age?