Hi Lamly
I am not running biodiesel in an Isuzu yet but I plan on it. I am running biodiesel in a 1981 Peugeot 505s Turbo Diesel. Yes, biodiesel cleans out the diesel sediment from the tank and it winds-up in the filter. It is no big thing. The recomendation at http://biodiesel.infopop.cc where I found this forum linked, is simply have a few new filters ready to go when you start running biodiesel. Rubber does not last long with any oil and biodiesel is oil. I figure that my hoses will need to be replaced when I see them get spongy and soft, maybe six months to a year from now. Newer engines use Vitron for fuel lines and seals. I don't know about the fuel injector pump, I have an old car and I plan to run it until something goes wrong, then look and see if there is rubber in there.
That said, tell me about the Isuzu diesel in the Jeep. This is why I am here. I want to find a diesel engine for my wife 's 1989 Isuzu Pup. I want to see about converting it from gas to diesel. I have done a similar swap ten years ago with a Mercedes 240d to Chevy 4.3 V6, but now that I am making my own biodiesel and the Pup threw a rod I hope I can do it again.
Brian Rodgers