I work as a maintenance technician/mechanic for an airline catering company... our dominant catering truck is a Ford F700 with 429ci PROPANE powered engine.
Its not all as easy as your thinking.
There is a propane regulator consisting of a dozen or so diaphragms, there is a propane lock-off which is electronically controlled and told when to open (essentially operates like a throttle body), then there is the carburetor... basically sits on top of a 4 bbl carb + a stacker, it too consists of about 6 diaphragms and is a very tall piece to give the right amount of venturi effect.
In winter, the regulators freeze and the vehicle is uselss for hours... we run HD block heaters to prevent this, but below 15*F, they will still freeze up if not ridiculously maintained.
There really is no troubleshooting... you have a fuel problem.... you spend 2 hours and rebuilt the lock-off and regulator assembly because of ONE microscopic tear in one of the dozen or so diaphragms has caused a leak.
also, you must have a rated tank, and an emergency lock-off valve in the fuel line as well as a high press. emergency relief valve on the tank.
Unless you're a mechanic, with a minor in engineering, I would just leave the whole idea alone... its ugly.
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John
'09 Saturn Aura 2.4L
'94 Chevy Camaro Z28 (5.7L 6sp)
'96 Chevy C1500 (5.0L 5sp)
'08 Kawasaki Vulcan 900 Custom
'01 KTM Duke 2
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