Help with annoying Sniper sound

[Oregon LC]

Can anyone help me pinpoint this sound? It's definitely not mechanical as it doesn't make any noise when the vehicle is off and the throttle is operated. I believe it has more to do with vacuum, it's more pronounced under a load, when going up the hill etc. The fuel lines are all SS bent by me.

Usually the sound is just a quik chirp when shifting between gears. For the video, I tried really hard to make the sound more pronounced just to hear it better.

 

[zerotreedelta]

I did an inline regulator and hard-capped the outlet vs using the one in the Sniper...but I wonder if it's something in that built in fuel regulator/bypass. Somewhat sounds like a valve chattering when it's riding right at the threshold.

Edit: the chirp between gears does somewhat seem like vacuum though, if it relates to manifold vacuum spiking when the throttle goes closed...

The stainless lines are spiffy, though.

 

[steffan]

complements on the plumbing - very nice

 

[Oregon LC]

@zerotreedelta I've never considered the fuel regulator/bypass on the Sniper body. Yes it sounds like a valve chattering sound for sure. Unfortunately it only does that when driving so I can't just stick my head underneath the hood to diagnose. Thanks for the tip, it gives me another clue to check out.