Do i really need an anti siphon valve?

[HDJ81MAX]

I will be using an aux trasfer tank. I purchased a top siphon 2" plug that has a 90° elbow to 3/8 with siphon valve. Or should I just use the bottom plug or the tank and add a brass 3/8 fitting?

 

[Jeepadict]

I have 2 different aux/transfer tanks configured for use with my MEP genset. I made my adaptations from the bottom drain plug port. One tank I used iron pipe fittings due to the large drain size, the other I used steel hydraulic fittings and hose since the port was small. I have no valve in play other than the needle valve at the end where the aux hose connects.

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[Ray70]

The need for an anti-siphon valve probably depends on the vertical height difference between the generator and aux. tank.
I would think that if the height of the fuel in the tank is substantially lower than the generator, you may want a check valve to prevent the line from draining back into the lower tank and becoming air bound.
Note, the smaller the diameter the line, the less likely the fuel will be able to drain back, as long as there are no air leaks anywhere.

 

[HDJ81MAX]

The need for an anti-siphon valve probably depends on the vertical height difference between the generator and aux. tank.
I would think that if the height of the fuel in the tank is substantially lower than the generator, you may want a check valve to prevent the line from draining back into the lower tank and becoming air bound.
Note, the smaller the diameter the line, the less likely the fuel will be able to drain back, as long as there are no air leaks anywhere.