Very hard to start after its been running a few minutes, seems like it lacks fuel and at 1.5 psi that was my first guess. I haven't had it running more than 10 minutes at a time and only had it running a couple times. I don't believe its gotten to 180F ever, yesterday my infrared thermometer was showing 135 on the cyl head and steel radiator return tube. Long periods of cranking and only occasionally seemed like it would light-off but no joy. Let it sit awhile and started immediately, ran literally 1 minute and would not re-start. I did notice a slight leak at the float-bowl inlet fitting, just enough to dampen the area, more of a weep. 'Think I have that fixed now, noodling with the grille today. Pump should be here Wed. Do you have some brilliant idea that will make me change the name of it from "buyer's remorse"?