My GPX30 starts and runs for a short time then stalls. It will run for 20-40 seconds at a slow idle before it dies. It'srunning really lean- if I press on the accelerator it dies right away. If I try starting it again right away it will catch for a few seconds or not at all, but if I let it sit for a few minutes it will run longer. The longer I wait the longer it runs, up to about 40 seconds. I'm not really familiar with propane systems, but it seems like it isn't getting enough fuel. It seems like some component slowly fills up like a reservoir and allows the system to run, but then there isn't enough flow to keep it going. It has an Impco 100 with a vacuum regulator. There is coolant going from the vaporizer to the regulator, and there is a strong vacuum at the hose going to the valve cover breather. I pulled the back side of the regulator and the diaphragm looked good. I played with the timing and checked the rotor and cap-they aren't perfect, but it doesn't misfire so I don't think that's a problem.

For the record, I had just fixed another problem (fwd/rev not working, directional fuse blown) and I had the instrument panel off and the directional switch disassembled, and when I put everything back together the stalling problem started. I can't see how the two are related because I don't think the Impco system has any electrical connections, but it was running fine before that (other than overheating from low coolant), so the timing is a little suspicious...