If memory serves me correct it was something in the range of Outlet Pressure (Nominal).-1.5" w.c. Use the specs from the Impco information from thier site on that particular vaporizer/regulator, the specs are there.
Now if you want to verify the regulator pressure you can get an lp pressure guage and check it. Now from his description and based on what i have experienced with LP systems in the past, if it only wants to run when he REMOVES the main inlet hose from the mixer there can be only 2 problems happening here, it is either sending way to much LP to the mixer and flooding the engine out due to a faulty vaporizer/regulator, or the mixer itself has some type of issue and isnt allowing the gas through or once again may be leaking too much gas into the engine by misregulation of the gas due to a diaphram issue. If you find no visible apparent damage there you can reassemble it. Check the center button assy on it as this is what actually controls the opening and closing of the gas flow and make sure its clean and the seat inside the button assy seat in the mixer bowl is clean also. If it is dirty, carboned up you can clean it using carb cleaner. Check the diaphram for any abnormalties like holes tears or deterioration. Be careful when taking this apart because there is a gasket made on to the diaphram, try not to tear it up because this seals it, if you tear it you will be replacing it. Then remove the top of the mixer, there should be some adapter plates that cover up the diaphram assy which has several screws around the outside edges of it. If all checks ok with that test and you do get a fairly strong vapor out of it then you can move on to the mixer and check it.
If you get anything like liquid or get nothing out of it then there is a problem in the vaporizer. While the engine is cranking over you should get some vapor out of it, you should be able to hear when the vaporizer opens and starts blowing it and may even get an LP smell but it shouldnt be anything other than vapor. You can remove it from the mixer end if you like, then crank the engine over. Once you've verified that the VFF is working reconnect the line between the VFF and the vaporizer/regulator and reconnect the vac line to the mixer, then disconnect the out line between the vaporizer/regulator and the mixer.
Nissan enduro 50 forklift starter skin#
You dont want to fill the area with LP gas and especially dont want it to spray on you, it can freeze/burn your skin very fast.
You can remove the line or loosen it between the VFF lockoff and the vaporizer/regulator and then apply vacum to it briefly by disconnecting the vacum line from the mixer and apply vacum to it, you should get a strong shot of LP out of it, there will probably be liquid as well being it will be straight out of the tank so stay clear of it and ONLY hit it briefly. As for the mixer it is the correct type for this system as i have seen many of these on this size engine. The VFF30 is just a filter/lockoff valve and was commonly used on many LP systems and its only function is to filter fuel and turn the system on and off and is operated by vacum from the mixer assy. The TB45 engine can run with either vaporizer/regulator on it be it the Model J, a cobra or a Model L. We are dealing with an LP system that is compatible with the 6cyl engine he has, it has ran for 10yrs this way and imo we should concentrate on the problem he is having with it and what it would take to diagnose and repair it, not if its the correct one or not. To make a long story short weather or not this came factory installed or not is irrelevant. This is not uncommon and used to be a regular practice by dealerships years ago when customers wanted LPG powered trucks over gasoline and was not offered as an option from the factory, or the truck was just what they had in stock and they did the conversion on it locally due to either cost or availability of conversion kits from the factory. So there is a possibility that this truck may have been converted to an LPG system by the dealer when sold as a new unit. All my resources show this truck produced as a gasoline engine and no references to LPG parts at all. Well unless MEngr has a assembly line production sheet from nissan his assumption on what system that is supposed to be on this truck is just that.
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