Staffsargeant 4 #1 Posted June 9, 2019 I have a 1996 WH 416. When the engine is running it will surge. I have change the inline fuel filter. Does anybody know what causes this? Thank you 1996 416, The engine is surging when it is running. I have changed the fuel filter. Does anybody know what the problem is? Thank you 1996 416, The engine is surging when it is running. I have changed the fuel filter. Does anybody know what the problem is? Thank you Share this post Link to post Share on other sites
wallfish 18,131 #2 Posted June 9, 2019 9 out 10 times it's a dirty carb or extra air leaking in. If you can calm down the surging down by slowly closing the choke, the problem is air to fuel mixture in or around the carb. The common possibilities are a dirty carb or extra air leaking around the throttle shaft and or gasket or all of them. The choke closing is limiting the intake of of air and therefore matching the amount of air to the fuel. 4 1 Share this post Link to post Share on other sites
953 nut 60,074 #3 Posted June 9, 2019 First question, have you been using gas that has ethanol in it? If so then stop! Go to this site to find the real thing. https://www.pure-gas.org/ Use some spray carburetor cleaner and spray it around the throttle shaft to see if the surging stops. If it stops you need to add a bushing to the shaft. Buy some "Sea Foam" gas additive and add it to your fuel and add it to your ethanol free gas at double the recommended rate for a couple tank fulls. Let us know how you make out. 2 Share this post Link to post Share on other sites
Ed Kennell 42,044 #4 Posted June 9, 2019 4 hours ago, wallfish said: 9 out 10 times it's a dirty carb or extra air leaking in. If you can calm down the surging down by slowly closing the choke, the problem is air to fuel mixture in or around the carb. The common possibilities are a dirty carb or extra air leaking around the throttle shaft and or gasket or all of them. The choke closing is limiting the intake of of air and therefore matching the amount of air to the fuel. To locate the air leak, with the engine running, spray carb cleaner around the areas John mentioned above. If it sucks the cleaner in, the engine will speed up. 2 Share this post Link to post Share on other sites
Staffsargeant 4 #5 Posted July 12, 2019 On 6/9/2019 at 1:11 PM, wallfish said: Thank you for the info. I cleaned the carb and it run great for a while. Than it was back to surging. Does anybody have a detailed pic of where the air leaks could be?? Share this post Link to post Share on other sites
