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Odd problem with 4010 LP .
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Jon Hagen
Posted 5/21/2010 01:46 (#1208079 - in reply to #1208071)
Subject: Re: Odd problem with 4010 LP .



Hagen Brothers farms,Goodrich ND
plowboy - 5/22/2010 00:18

What is the purpose of the vapor valve? 

 

I have considerable experience with other LP engines, but have never run one which has a vapor valve.  Nothing I've been around will run worth a darn on vapor....can't get enough fuel to the engine to let you open the throttle without it leaning out.  

 

I drove to work every morning for several years on LP.  Never did anything but start the truck and drive out the driveway.  Only three times did I ever had an issue with freezing up, and two of those were because of low coolant.  The third was sub zero weather and it never quit running, just acted like I was running out of fuel for about a quarter mile.     LP wasn't perfect, but it sure beat the heck out of a quadrajet. 




I suspect the purpose of the vapor valve was to allow the engine coolant temp to rise a bit and warm the vaporizer before
putting liquid propane in it.
I agree that fooling with vapor to start is more trouble than it is worth. Vaporizer freeze up has only been a problem at -20 or colder, and then only if you rev it up immediately.

My old 80 GMC is hard to start cold when the tank is below 5% and supplying only vapor. It takes a lot more cranking time and likely will lean out and spit when it does start.



Edited by Jon Hagen 5/21/2010 01:48
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