Scottro,
It is only a dumb question if you are too stupid to realize that there is something you don't know and maybe you should know it.
I can't answer this because I never used alcohol in the fuel of any of my diesels or anybody else's for that matter.
The actual fact is that you are better off letting the water separating filter do it's job. They are good at what they do. Most are set up to be easily drained of the water that they have collected.
I can tell you that you should collect the numbers of the filters on the engine and order spares now. They will not be cheap, but not having them in the coach's kit will be an expensive mistake.
It seems that you do not have much service history on this coach. That be the case, change out all the filters now. Less that will cost money. If you wanted to save money, you should not have purchase an RV at all. A recliner and a bid screen TV would have been a lot less expensive.
After you get up off the floor when you are told the price of the complete filter set, and managed to carry them home, go on the web and find out where to get a better deal. You need to buy the first set locally so you know for an absolute fact where that they can be gotten on short notice.
You need to know how to replace all of them and how to bleed the fuel system to restart the main engine. This should all be in the engine manual. If you travel in a diesel anything, there is the chance that you will pick up a load of bad fuel.
What does this guy know?? Well I am a licensed ship's engineer (Chief stream or motor) and have been taking care of very expensive engines for a very long time. I have also owned five diesel road vehicles over that time. I have seen a lot of damage done by lack of attention.
Matt
