Posted by Steve@Advance on August 22, 2016 at 21:04:15 from (107.203.134.67):
In Reply to: Kohler dieing! posted by John M on August 22, 2016 at 15:45:46:
The empty fuel filter sounds like an air leak in the line between the tank and filter. When it's running, the pump is pulling vacuum on the line, drawing in air. When it shuts off, the fuel slowly refills the filter because the vacuum has stopped. Any chance the change over valve is leaking vacuum? Do the tanks pull off the bottom or do they have dip tubes? If they have tubes, they may be loose or have anti siphon valves or air bleeds. Question is, why did it work before but not now? Could try dropping a fuel line directly into the top of the tank from the pump as a test.
Not sure how the plumbing is arranged, but pumps don't like to have the suction side restricted with filters. It may work better with the filter on the pressure side of the pump, if it's not already that way. Also fine mesh filters work better than paper filters with the impulse pumps. Have you looked into the pump for trash under the valves or restricting flow?
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