I'd check for leaks. Had the same problem with a 580 Carb. Sled, ended up that the water catch lines that run out the bottom of the Float Bowl had a crack in it and was leaking gas out of it.
Fuel milage
Any body with a zr580 efi i need help! My gas milage is horrible i drove abot 7 or 8 miles today and i used a guarter tank of gas. The one thing is that the bolt that pushes on the back of the motor to help align the clutches was gone, but a guy i know helped rig up a piece to get by on but it still sucks gas. So what is the normal mpg for this sled i knew it wasn't the greatest but not this bad.
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