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Generac Propane Hard Start+ Backfire Bob 3-8-03  
Have a Generac LP66 propane powered generator. It has been very hard to start since it was installed. You must crank it for long periods and use the primer even in warm weather. While cranking it backfires through the carb and if it will start it continues to backfire for 2-3 minutes and then will smooth out and run. Have had it back to the installer 3 times. Each time they say its fixed, but the next time we try to use it, back to the same problem. This is in a emergency response vehicle and has become a big problem.Our own support shop has excellent machanics, but they told us they have little experience with propane and don't want to just throw parts at it without some idea of what to look for. Any info would be of great help.
Thanks Bob
Re: Generac Propane Hard Start+ Backfire Joe 3-8-03  
I have heard of many complaints like yours with the cold start on propane. I don't think there is one fix for all on this one. I would find another shop that works on propane engines. I have never thought this setup was a real hit.
Re: Generac Propane Hard Start+ Backfire Ralph 3-8-03  
Where are you located?
i work on lp products and more info would help. check plug gap should be no more than.030" what kind of lp kit is on it vapor or liquid get me all eng info and i will try to walk you thru set up or in you are in ct. area let me know
Re: Generac Propane Hard Start+ Backfire Paul 7-23-08  
Regap the plugs to.014-.016 and it should run like a champ.
Re: Generac Propane Hard Start+ Backfire Bob 3-9-03  
The generator is a Generac PrimPact 66LP. It has a 2 cyl vertical shaft OHV engine I belive to be a B&S. It is a low pressure system using vapor. There is a pimary regulator on the tanks and a Garretson regulator for the engine with fuel flow going through an Asco electric valve. All there is from the regulator to the engine is a rubber hose. No sort of ajustment valve or anything. The carb fitting is a straight tube that replaced the main jet. No defuser of any kind. Also there is no vacuum senseing tube like I have seen on other systems. The thing just dose not look right. Like the fuel hose fits tight on the regulator fitting but they had to mush it down with a hose clamp to fit the carb end. It seems like a fuel problem because with just the smallest shot of starting fluid it takes right off although it still backfires for a time.
Hope this is the information you need.
Thanks Bob
Re: Generac Propane Hard Start+ Backfire Mike 3-27-05  
Had same problem. Reduce the gap on the plugs to.025 and increase the LP pressure by 1" WCP. It starts OK now and no backfire.
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