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
Cummins will pull 40 inches of vacuum and it wont hurt them. I'd pull off the filter gauge and throw it away. I ran my Peterbilt 400,000 miles and changed the dual aircleaners 1 time IAW the MP Ga. on the panel. Get an accurate MP Ga and put it on with a cash mount readout. 6.2 MPG isn't bad.
