Newer electronic injection systems are much better in fuel management but, the temperature of the vaporizor regulator is still an extremely important factor when considering the gunk that clogs up systems. Vaporizor Regulators need to be between 160 to 170 degrees to operate properly and not further "crack down" liquified propane. If you run higher temperatures, most systems will require more maintenance in draining the gunk and more fuel system component rebuilds.
In the old days we use to install inline thermostats in the coolant lines going to the regulators. These thermostats were normally wide open. When the temperature increased above 170 degrees the thermostat shut down and the vaporizor regulator cooled. The normal impurities and by-products (DURING the expansion and temperature change in the vaporizor regulators) of the liquid fuel better stayed suspended in the vapor and was burned in combustion and not deposited in your fuel system. If your engine runs hotter or a customers application causes higher temperatures, you will get more gunk (drop out from further cracking down LP) in the fuel system. Bad LP can also contribute to the problem no doubt!