Air filter
My isl 425 in my Newmar is not getting enough air, the air gauge back nx to engine almost closes up after driving 100 miles with a new air filter in it an I'm just getting 6.2 mpg I'm thinking about d...
Forum Discussion
The OP doesn't say which air filter he replaced the old one with. Substandard, read cheap, filters give substandard results. Start with the easy stuff, make sure the filter is the correct one for your engine. Next, see if you can step up one level and still make it fit. IMO, your engine will tell you if it needs something else. I use the gauge to confirm what mine's telling me.....Dennis
