The 'propane thingy' that has water hoses going to it, is an 'evaporator'. It provides heat to help make the liquid propane want to become vapor.
Take a soft bristle brush and scrub off the surfaces of the fuel system components. You'll find under there brand and model names, possibly model type serial numbers. You'll probably also find plenty of dirt over the breather vents and such. Take photos of the identification.
The original evaporator for that vintage could have been by several major manufacturers, Ensign was one of the most prolific then. Beam, Garretson, Zenith, Algas, Hoof, Rego, Impco... and probably a half dozen others I've missed.
Propane fuel system needs the following steps:
- Storage (tank)
- Withdrawl Wethod (liquid or vapor). Mobile equipment, using small tanks need to be vapor withdrawl, stationary systems with large tanks are usually fine with vapor
Fuel lockoff- a method of shutting off fuel supply in the event that the engine isn't running. Lockoff is different from 'cutoff', which is a function of the fuel metering system.
Evaporation - Vaporous systems don't need an evaporator, but liquid withdrawl does. MOST evaporators use engine heat to warm the liquid and improve evap, as unevaporated liquid going into low pressure devices is really, really bad.
First stage regulation- drops tank pressure from whatever it happens to be, to either 10psi, 5psi, or 2psi
Second stage regulation - drops first stage pressure from 10/5/ or 2 to 11" water column (around 0.4 psi)
Fuel supply hand valve - on stationary engines, always place a fuel supply hand valve just before the fuel controller.
Fuel controller, aka 'zero governor' aka 'demand regulator' aka 'negative pressure regulator'. The function of this device is to accept gaseous fuel at 11" water column, and 'meter' it to the engine based on engine DEMAND. it is a mechanically proportional device, that has two other extremely important functions: When the engine is stopped, it must be sensitive enough to totally CUT OFF fuel flow... and when the engine is CRANKING, it must be sensitive enough to respond and allow fuel into the airstream. They are henceforth, devices that must be treated with delicate care.
LOAD Block, aka 'power valve' is an adjustable orfice located between the fuel controller and the demand point (the mixer) which limits the maximum fuel flow possible under full load. The piping between the fuel controller to the load block needs to be as short as possible, and unrestrictive, so that the load block performs properly AND the engine is responsive to load.
The 'spud'... an orfice which is located at the 'demand point' of a venturi... it is located in the divergent edge of a venturi, and airflow through the venturi generates negative pressure which draws gaseous fuel from the fuel controller, through the metering block, into the intake airstream. As airstream velocity increases, spud pressure at that demand point falls lower, demanding more fuel from the fuel controller.
Mixer - The mixer is a gaseous equivalent of a 'carbeurator', but it isn't a 'carbeurator', because it is not accepting and metering a liquid, it is simply mixing gaseous fuel with incoming air. The mixer can be a part that stands alone, with a venturi and spud, or it can be a liquid carbeurator that has been fitted with an additional spud point to be added as an option. A mixer can also be a secondary venturi with a spud, that is placed either between a manifold and carb, or between the carb and air filter.
Hopefully this will make it easier for you to identify the components in your forklift.
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