Pete Karasz V65 Fuel Pump Relay Schematic

Posted on April 13, 2014 by Art
This is a schematic of the fuel pump relay for a V65 Honda. Pete Karasz carefully removed the potting material from a defunct fuel pump relay and made this drawing.

This is a schematic of the fuel pump relay for a V65 Honda. Pete Karasz carefully removed the potting material from a defunct fuel pump relay and made this drawing.

Hi Art,

That drawing was preliminary and is incorrect. As I recall I sent copies to you, the Pelican and some others for comment. Part of the error was an incorrect interpretation of connector pins due to the error in the V65 wiring schematic.

The final correct analysis was provided by Tom Bowers who used an oscilloscope on the fuel cut relay of his V45 Magna while the bike was running. Using those readouts and the photos of the fuel cut relay circuit board that I provided he recreated the wiring schematic for the relay’s circuit. See and download from here:

http://www.mediafire.com/?9zztvvi2vcgyh90

All the best

Pete

Or here. I saved a copy for myself: Tom Bowers’ V4 Magna FUEL CUT-OUT

About Art

55 years old. By training, ability and experience I am a master toolmaker. My most recent projects include designing and building a process to grind a G rotor pump shaft with four diameters and holding all four diameters within plus or minus 4 microns of nominal. This was an automated process using two centerless grinders refitted to my specifications using automatic load and unload machines plus automatic feedback gauging. I also designed and built an inspection machine to check for the presence and size of a straight knurl on a hinge pin using a vision system for non-contact gauging.
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