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Hey Autoshopteacher, I have one just like your photo (but no camo paint). Yes, I thought about mentioning pressure and I agree with you. Of course having a bit of dish soap to see bubbles helps and any small holes in the tank would not be spotted unless you remove the pickup tube and block...

No in tank fuel pump. It's suction. As far as running with a bad pump...probably not...since the fuel is put into the cylinder on the compression stroke (pressure), not on the intake stroke (vacuum). I keep my bet on a loose fitting or a small crack in the plastic line, probably very near a...

It is probably a very small leak that is less significant at higher rpm, since it is pumping more fuel. While letting the pump get a small amount of air with the fuel, it is not enough to break the vacuum. At idle, with less fuel flow, a small amount of air makes a big difference and once...

That gets my vote...cracked line or fitting loose.