if your going to use a cleaner on the injector i would use the mass air meter cleaner

I have installed a thermostat in the coolant line feeding the vaporizer & it has helped a great deal in the life of the regulator, but the injectors still get hot & the wax in the fuel turns to hard tar & clogs them. I'm unfamiliar with what's inside the fuel side of the injectors, so I'm hesitant to just use brake or carb cleaner- I don't want to ruin the injector if there's a chance it can be cleaned.

As far as the plugs- I am aware that a hotter heat range was the norm on older lifts, unfamiliar if that's still the case. I'm not sure though how the heat range of the plug would affect the tar build-up in the injector.

Those of you that are experiencing issues with LP fouling out injectors. You may do some research on the spark plugs that are being used.

I am almost certain that Hyster/Yale do not call out for 2 different spark plugs between gas and LP. GM is going to install plugs for gasoline application and LP needs to be one heat range hotter.

When I went to an Impco school many years ago, I had a discussion with the instructor on LP conversions from gas. As I was about to get multiple trucks from a customer that wanted to convert from gas to LP. He said that the plugs were important to change to a hotter heat range for thorough combustion.

I just dont know for sure if this stands true still for computer controlled systems, but I'm pretty sure it does.

the only solution is the temperatuur from the cooling system reducet to the regulator, so that the deposition is not longer formd.

Thanks swoop- I know gas & diesel injectors get cleaned, I just thought there may be a lpg cleaning I wasn't aware of. You are aboslutely correct about the grade of fuel being a factor- this customer refuses to change propane vendors, even after I show them the gunk in the regulator after only 6 months of service. Between the excess tar & the temps these lifts operate at, it's a wonder the propane system lasts as long as it does

there is no service that cleans these that i know of,
most guys i know just use a mild solvent or some type of fast evaporating cleaning spray.

In most cases the cleaning will buy you some more time but in the end the injector winds up being replaced anyway.

This discussion has been made on this forum several times about quality of LP gas and the oil content that is in different brands of LP Gas. I believe it has been established that the oil content in the gas builds up and can cause damage to diaphragm, seals and in this case internal injector components.
You might want to try changing LP Gas suppliers and see if the problem goes away. ;o)

AND ultimately the problem might just be the injector itself just going bad. They are designed to last a predetermined "life cycle" span and it could just be they are wearing out after that amount of time. You would think they would last indefinitely but since the technology is still somewhat new in this industry with these type systems the lifespan is still somewhat sketchy. I'm sure in time they will design a better component that is more consistent in its durability.

Does anyone get the lpg fule injectors cleaned or do you just keep replacing them? I have a customer who's injectors clog about every 1.5 years. Any suggestions?