Checking fuel pressure? Fuel gauge not reading right.

After a few phone calls, adjusting my tune over and over. I have this hesitation and stalling that keeps coming back. Yesterday I noticed my fuel gauge isn’t reading right anymore full tank shows just over half tank on gauge and half a tank of fuel show empty on gauge. .

I’m beginning to think the in tank fuel pump and float are taking a crap on me. Before I take my 3 month old quad in for warranty work and claim its my fuel pump, I wanna check my fuel pressure. Can I do this without removing the fuel line and injectors? Is there a port I can hook to?

I’m wondering if dirt, sand or water is getting into my tank through the cap. I read that on here somewhere that a few guy s had this problem. But my cap seals. There’s alot of suction when I remove my cap.