Okay, I am going to change oil, oil filter, air filter and fuel filter in my 8KW diesel generator myself for the first time. I have crawled under the gen set and found the trap door to access the fuel and oil filters. I also noted that it will be easier to change oil filter with the fuel filter out of the way. My question is, how much fuel is going to leak out when I disconnect the fuel lines? I have a 2 gallon catch pan for the oil and was hoping that will be big enough to catch the fuel that leaks out also. Any help would be great.