Where is the check Valve located?

There are a couple of options where some guys have used check valves. I use one on my vent line to provide more consistent fuel delivery and keep fuel from draining out the vent line when the model is nose down.

There have also been guys that have installed a check valve in the feed line from the tank. They say the same thing...Helps give more consistent fuel delivery. I have never done this and don't feel its needed.

I also know that some guys have installed a check valve in the feed line from the needle valve up to the injector. Again same idea. I have not found this to be an issue either.

The fuel system on this motor is identical to that of the 140DZ

Troy