To start type four suction fill, select your type four page and then start your type four pump.

The type four pump will spin a couple of times until it builds pressure in the line and then it will stop automatically.

Once you've turned on your type four pump and it has stopped on its own, you will connect your external source to the suction fill port.

Open the ball valve from your external source.

It is often a good idea to try to purge air from your suction hose.

Lock it all in and open this valve first. The pump should start on its own.

Opening this valve provides a direct path to the tank with no restrictions.

So the pressure in your circuit should drop.

The pump should start automatically and you should be moving fluid from the onboard tank back to the onboard tank.

At this point you throw your secondary suction fill valve from the normal position to its fill position.

Doing so switches your source from the onboard tank to the external tank, and with both valves open, you should be filling the truck with Type 4 fluid.

Once your fill operation is complete, switch your source back to your normal for your onboard tank.

The pump should continue to run until you switch the first valve closest to the pump back to its normal position.

And then pressure will build in the line and the pump will automatically stop.

At this point you can disconnect your supply hose and go about your de-icing operation.

So the most common issue you will have with type 4 suction filling is going to be air in the system.

So the first thing you will want to do is purge air from your supply hose.

Then purge air from the Type 4 Circuit.

The easiest way to purge air from your type 4 circuit would be to open your main nozzle out at your basket.

When you do that, you will get some fluid, but then you should get some hiss and a spurt of air.

Once you start getting a solid stream of fluid again, you can shut the nozzle at your basket off.

Then, make sure all your valves are in their fill position.

If all is done correctly, the suction fill should take off and fill your tank very quickly.