Yale GLC040 with a Aisin closed loop regulator. Truck had classic symptoms of a bad regulator. Regulator was replaced with new using Yale part number. New regulator had a different tag number and was slightly different with the addition of an adjustment screw on the top. Upon installation, the injector hose was found to be full of tar and the injector stuck open. Injector was cleaned with alcohol and seemed to close. Truck ran considerably better but had flooding issues when starting. A new injector was installed with the same problem. Coolant level is correct.

What does the adjustment screw on the new regulator do? I can find no technical manuals on the Aisin regulators. The screw was was 4.25 turns out from the factory, it was reduced to one turn out and seemed to make improvement but still floods to the point of smelling propane.

Current situation is the truck will start as it should when cold and runs well. With an immediate shutdown and restart it typically starts fine but if its left off for a minute two it is back to the flooding problem.