Specifications

Some engines use an electric fuel switch mounted on the fuel pump. You see it on the
right side of this photo. It has one wire connected to it.
The fuel valve is opened by applying 12 volts the top terminal. When powered it causes
a spring loaded plunger and stopper to open. When open, fuel flows normally to the fuel
pump. When closed due to the power being interrupted perhaps from a low oil pressure
sensor for example, it shuts off fuel supply and causes the engine stop running. The fuel
pump gets no fuel to pump to the fuel injector. Most failures are a result of debris in the
fuel or varnish build up that cause the plunger inside to stick and either not open fully or
stick. When this happens and the engine is running what you notice is black smoke and
erratic engine speeds. When it fails it may also cause your engine to shut off for no
apparent reason.
When this switch is sticking the result is often black smoke from the exhaust and erratic
engine speeds.
A quick cure for this problem is to simply unscrew this part and remove the spring and
plunger. Start engine again and see if it runs normally. Often you can just reassemble it
and it will work again. When the plunger is removed, you can only shut off the engine
buy releasing the run/stop lever. They key switch or remote will make no difference.
Note that poor fuel quality can damage the rubber fuel lines and this switch causing
components to stick.
Hooking Up To Your Home
A manual transfer switch is the key to safe and convenient operation of portable
generators for standby power. By isolating those circuits using generator power, a
transfer switch eliminates the risk of back feeding the electrical utility, which can cause
injury to workers and property damage. By installing a transfer switch at your breaker
box and connecting a portable generator to the transfer switch, you can run selected
circuits for appliances such as a furnace, well pump sump pump, refrigerator, television,
computer, printer or lighting circuit during a power outage, depending on the capacity of
your generator. Since many portable generators cannot handle all of these loads at the
same time, the transfer switch allows you to manually transfer each of these loads
separately whenever you need them.
Determining which circuits you will require during a power outage is the first step in
selecting the proper wattage generator and transfer switch. Since most home
appliances operate intermittently, a 3000 watt generator can provide adequate power to
circuits for the most common appliances, such as furnace, lights, refrigerator, freezer,
microwave oven, and TV. If your home has a deep well pump with up to 1 HP motor, a
5000 watt generator will be required to provide the starting capacity for the pump.
AGI6500DE & AGI6500SDE Operator / Owners Manual Version 11.4
Page 41