Hello. I bought a used B7510 and it's now time to change the fuel filter. The manual says how to physically change the filer (loosen plastic bowl, replace element, reassemble). And then it says you need to bleed system. For bleeding the manual says to fill the fuel tank w/ diesel and then start the engine and run for 30 seconds. Does anybody know how this works. I've had other diesels and bleeding involves opening a valve and pumping. Any help would be great. Thanks in advance.