Hey my new to me lovely wagon 300td has a leaking fuel injector pump; but it seems that the fuel is leaking where the screws are and they were a bit loose. But after driving it for about 5090 miles it started loosing power and after about 10 miles it just stopped restarting. First thing "I thought was clogged filters because I had just started using a 50/50 blend of biodiesel. The biodiesel is of high quality and filtered down to one micron. I changed the filters even tho they didn't seem to need it and no change, no start. What could it be? I'm not ready to pay over a thousand dollars to see if its the pump without testing it myself first. I need some tests to perform and ideas of what tocheck. I love this car!