Quote:

Re: [Country-Coach-Owners] Fuel Shutdown Solenoid on Power Technology 7.0K Generator


Your thinking is correct. One coil in the solenoid is high-current and
is used to initially 'pick' the solenoid and retract the plunger. The
second coil is to 'hold' the solenoid plunger retracted and continually
allow fuel to flow. That second coil takes much less current and is
usually controlled by a 'run' relay or control circuit - depending on
the setup. Low oil pressure, high water temp are some of the things that
can turn off the run relay. Had to replace mine on the Cummins a few
years back and your description of the problem is almost exactly what
mine was - except mine was that hold coil heated up and gradually lost
its ability to hold the solenoid retracted. This was a known problem and
Cummins had a heavier-duty solenoid as a replacement that also required
the mounting for it be changed out.

I'm not aware of these fuel solenoids working any other way.

Since you have the solenoid in your hand and can't get one of the coils
to keep the solenoid in, you're heading to the parts dealer.

Incidentally, holding the start on for extended periods of time can
overheat the coil and burn it out. There are generally safeguards
against this (thermistors, oil pressure interlock, etc.) - not sure if
they are employed on small diesel engines. However, if you have had hard
starting problems where the 'pick' coil was active for a long time,
that's probably what eventually caused the coil burnout.

Mike
'95 Magna 5266