Nippon Denso fuel shutoff solenoid

[Bradley Tiller]

6BTA 250s, engine starts but will not continue to run because the solenoid will not remain in the “hold” position. Starboard engine only.

This started after thoroughly cleaning engines; ignition alarms for both engines stopped working right after that (but gauges on dash came on) and engines ran. Then the solenoid issue arose the next time I tried to run them several days later. I assumed moisture intruded to harness connections as well as connections to the solenoid. I checked and cleaned those. Now alarm sounds when ignition is switched on but no go w/ the solenoid?

Any Ideas? Thanks!

Topic

[Rob Schepis]

Thanks for the posting the resolution. Did you take any pics? If so, post them please. They would be helpful to others.

[Bradley Tiller]

Resolved

Removed the solenoid and disassembled, thoroughly cleaned. Lots of black stuff (carbon?) in the cylinder. Replaced and now it holds. Thanks for the input.

[Jerome Billett]

I had a similar issue. FWIW after much ado it was the Sea Fire (Fireboy) module failing. If you have one of those extinguishers, try bypassing it and see if the problem remains.

[glenn111]

Might try swapping the solenoid between engines. Should be relatively easy and will put you “in the ball-park” of where the problem is located. If the problem moves to the other engine, perhaps then solenoid or connector at fault. Otherwise, could be much more difficult to isolate. Good luck.

[Bradley Tiller]

Will do, thanks.

[Tony Athens]

Start with looking up the wiring diagram(s) for your engine on this web site.. Study them, and go from there.. The circuitry for this system is simple.

Tony

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