Low Tank Makes Gun Act Weird

[Chris_PB]

Ok once my tank gets to around 1k it wont shoot all the time, the bolt will shoot forward..and then not go back,now i shot it last weekend and it had no trouble like this,i did do the mini reg mod and make my lpr 5psi higher,also when i shoot with paint it makes a hissing sound..this is also when it gets down to about 1k,but otherwise its fine!

Should i turn up the dwell cause i have it like the first 3-4 bars,or lube it or what, thanks

[alohn2000]

First, what kind of tank are you running?

[Chris_PB]

I am running an hp crossfire 47/3000..for now

[alohn2000]

I'm guessing its about 800-850psi output. And if thats the case, when it gets that low the reg. on your tank probley just isn't flowing well. My buddy is running the same tank and I know he wont let his get any lower than about 1500psi. And if the hissing sound is coming from the breech block, it sounds like your exhaust valve isn't sealing all the way, maybe from not enough pressure on the back side to seal completly. Try pulling it out and making sure the spring is centered. Then dry fire a drop or two of oil through the gun and see if this helps.