T e c h n o l o g y , L L CDIESEL PRO ® 245TECHNICAL MANUAL FOR DTNA8www.davco.com800-328-2611Saline, MI 48176P. O. Box 487DAVCO Technology, LLCF1353 REV BVISUAL DIAGNOSTICS WITH CLEAR COVERFuel level is not at the top of the fuel filter.ÎNormal - Do not change the filter.Fuel level is at the top of the filter and appears to be full of wax.ÎChange the filter - Run the engine for a minimum of 25 minutes at idle. Do not run at full RPM.Bubbles are seen flowing in with the fuel.ÎCheck all fittings and lines from the fuel tank to the Fuel Processor. Check lower and upper collaro-rings.Fuel drains back to the fuel tank when changing the fuel filter or draining separator.ÎRemove the check valve assembly. Clean or replace and retest. Check air leaks in the fuel system.Fuel level is at the top of the filter. Low power.ÎChange the filter at the first available opportunity.There is a power complaint and the fuel level is below the collar.ÎCheck for a missing grommet at the lower end of the filter or missing/broken spring at top of filter.Water is noticed in the cover.ÎDrain the water.