You're running a front mounted tank,(right), also is the line feeding the pump at least a #10, also is the pump mounted below or level with the bottom of the tank. I had a friend who had the pump mounted too high, and on one run he forgot to refil the tank between rounds, luckly the other guy redlite, and my friend ran 4 ths slow, pulled plugs checked everything, not popping or anything. Then he slapped himself in the head, filled the tank and went right nack to the previous #'s. He's since remounted the pump below the bottom of the tank.
Just a thought
Zip.