Rigorous SAE/TMC Type II fuel economy testing by Auburn University showed a 3.5% improvement in fuel economy for a Class 8 tractor fitted with a new aftermarket closed crankcase ventilation (CCV) ...

Trouble ranging all the way from bad gas mileage to burned valves has been traced to faulty fuel I pumps. But faulty fuel delivery is often due to some bad condition entirely outside of the fuel pump ...