The Fuel System Choices are yours
Things may have changed as far as fuel system design is concerned since I built my RV-6A but I doubt that they are vastly different. You are left to configure your fuel system from some basic sketches. Some time ago this website and the RVator had considerable discussion about gascolators and in-line fuel filters. Specific model numbers of auto fuel filters used were identified by builders. Laws making it illegal to dump fuel from preflight tests and the independence of filters for each tank are a couple of things that favor filters. I have a separate filter for each of my four individually selectable tanks and I do not reach a single point failure candidate until the main fuel valve is reached. There is no gascolator in my RV's fuel system. The detailed design and all of the component procurements for your RV fuel system are up to you. This is probably one of the areas of greatest variation between RVs and it is one of the most important. You probably noticed the hot thread about resistive and capacitive fuel quantity sensors. Auxilary fuel pump selection and mounting location, priming system, venting, tube routing, hose and tube options, hose and end fitting choices are part of the variables in anyone's "RV" fuel system. Contamination can be introduced at any time of course and you have to decide how to minimize the risk to a level you can live with.