From: muratlanne@gmail.com   
      
   "Leon Fisk"  wrote in message news:104h2st$31mf7$1@dont-email.me...   
      
   Mine would stumble at times and catch again. Usually on HOT days and   
   after running the gas tank maybe to half or less (filled before   
   mowing). It has a Kohler Command 25hp 2-cyl on it with a Crankcase   
   Pulse Fuel Pump. Just put up with it for awhile but it kinda bugged me.   
   I ordered a cheap replacement pump and a new air filter on a hunch. The   
   Air Filter looked okay but had oil from the rocker cover (vapor   
   recovery) contaminating it. Replacing the Air Filter got rid of the   
   stumble, didn't need the new pump. Has been a couple years now and   
   hasn't happened since. The vapor recovery is a direct shot into the   
   intake, bypasses the Air Filter. Think it was sucking so hard on the   
   vapor recovery that it was messing up the amount of "pulse" available   
   for the fuel pump...   
   Leon Fisk   
      
   -----------------------------------------   
   Maybe the cause was the pressure drop through the clogged filter. The quick   
   test would be running without it.   
      
   I picked up a couple of these second-hand to measure wood stove draft and   
   heatsink pressure drop, an indication of air flow rate. This would be a good   
   use for them.   
   https://www.dwyeromega.com/en-us/low-differential-pressure-gauge   
   no-power-needed-ip67/p/Series-2000-Magnehelic?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)