I have a 1974 minne winnie. Brought it home the other week with everything running just fine. Went to start it up two days ago and the battery was dead (not that big of a deal, just charged it up). After charging the battery when I go to start it, it will crank pretty good just wont turn all the way over. When I put the keys in it shows my oil level is low or does that not show accurate until the engine is running? That is a possible problem. Was also thinking maybe its the fuel filter? Got under the RV but didn't see where the fuel filter is, anyone know, and is it very hard to change? Any info would help, thanks for your time!