I have encountered numerous situations where once spark plugs get fuel-soaked, they just refuse to let the engine start, even after sandblasting the plugs. No idea why, but just putting in a new set of plugs would make the thing start. The plugs would even get a healthy spark when removed from the engine and fired out in the open air, but not under compression for some reason. Once you're sure the flooding situation is fixed, try another set of plugs that haven't been fuel-soaked.
Jerry
Edit: Pump a little gas out into a container, pour it on the ground, and see if it lights with a match. I've seen gas go stale to the point it wouldn't match-light in a fairly short time. If you're using fresh gas, disregard!
Jerry
Last edited by Hotrod Lincoln; 07/02/2008 3:47 PM.