I had the same indications and after replacing the primay filter with the water drain I had the same problem. I replaced the seconda one in the engine compartment and that solved the problem. I would drain fuel from the one with the drain valve and see what yout get. I would also take off the secondary filter and poor the fuel into a clear container to see if it really needs changing. It would be worth trying to tighten them and you should be able get both hands on them which is usually enough to take them off or tighten. Park with the back of the MH up high so fuel does not run out while you are checking. Turn the key on for 30 seconds several times to prime the system before trying to start. Cleaner made from orange peals helps on getting the diesel smell off our hands and arms.:W