It is well known that the OEM LC8 fuel pump is a weak point in the design of an otherwise high quality piece of machinery. It uses mechanical contacts to provide "interrupt activation" of the Mitsubishi diaphragm pump. It is located in an area (under the front of the engine) that receives the worst that the environment has to offer and are
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subject to corrosion, pitting, and wear like all point activated electrical breakers. There are several fixes in the works by Forum members at this time. Take a look at what others have done and copy, improve, or come up with your own design to share:
Carter electronic cylindrical type: Louge's photo documented install.
Facet 40105 cube type solid state: Pyndon provides a photo essay of his workmanship.
Facet 40171 fuel pump installation: cpmodem's photo how-to for installing this "latest" improved part.
Mikuni Vacuum Fuel Pump Upgrade: Hammer does it "his way" without 'lectrics.
Mitsubishi (OEM 950) solid state conversion: rideswestKTM describes the latest version of his kit to convert the OEM's problematic fuel pump points.