FLtractor 170 #1 Posted June 2 (edited) Evening, Went to start 856 today after new battery.. old then brand new non ethanol fuel.. brand new fuel lines.. filter.. electric fuel pump.. new aftermarket carb.. newly wired and brand new ignition.. has spark.. but tractor wouldn’t even attempt to run other than just turning over from key.. issue most likely the carb needing fuel and air screws adjusted keeping it from running? Also noticed fuel leaking from the brass fuel pump fittings (ideas to stop this fuel pump leak? Never had fuel or even been hooked up and ran from battery before- first time ever) and from newly replaced under tank fuel valve.. and noticed a liquid (fuel?) every so often dripping from the muffler, just a drip every now and then when turning key attempting to get started with engine turning over but no combustion happening. Why would it be dripping from there? Edited June 2 by FLtractor Share this post Link to post Share on other sites
Ed Kennell 46,227 #2 Posted June 2 Does it have compression? Exhaust valve not closing? 1 Share this post Link to post Share on other sites
953 nut 66,628 #3 Posted June 2 (edited) If you have fuel dripping from the muffler it is also leaking into the crankcase diluting your oil. time to rebuild the carburetor and do an oil change. Edited June 2 by 953 nut 1 1 Share this post Link to post Share on other sites
pfrederi 20,675 #4 Posted June 2 What pressure fuel pump did you use. It may have over powered the float valve in the carb. How did you verify spark? Was the plug wet after you cranked it for a while. May be really badly flooded. 1 1 Share this post Link to post Share on other sites
peter lena 9,901 #5 Posted June 2 @FLtractor been using carbole electric pumps for years 2- 3.5 PSI no issues at all , pete Share this post Link to post Share on other sites
FLtractor 170 #6 Posted June 3 16 hours ago, Ed Kennell said: Does it have compression? Exhaust valve not closing? Yes engine has compression Share this post Link to post Share on other sites
FLtractor 170 #7 Posted June 3 16 hours ago, 953 nut said: If you have fuel dripping from the muffler it is also leaking into the crankcase diluting your oil. time to rebuild the carburetor and do an oil change. Even with it being a brand new carburetor first time ever ran or filled with fuel? Share this post Link to post Share on other sites
FLtractor 170 #8 Posted June 3 21 hours ago, pfrederi said: What pressure fuel pump did you use. It may have over powered the float valve in the carb. How did you verify spark? Was the plug wet after you cranked it for a while. May be really badly flooded. 4-1.5 psi. I believe the same one you recommended to me which you mentioned never having a Problem. With the 2 straight fittings. used spark plug light bulb tester to Verify spark. didnt pull spark plug after. Was getting dark and went in for evening. Share this post Link to post Share on other sites
adsm08 4,562 #9 Posted June 3 22 hours ago, 953 nut said: If you have fuel dripping from the muffler it is also leaking into the crankcase diluting your oil. time to rebuild the carburetor and do an oil change. Don't forget that a failure of the fuel pump diaphragm will put the whole contents of the tank into the crank case real quick. 1 Share this post Link to post Share on other sites
pfrederi 20,675 #10 Posted June 3 2 hours ago, FLtractor said: 4-1.5 psi. I believe the same one you recommended to me which you mentioned never having a Problem. With the 2 straight fittings. used spark plug light bulb tester to Verify spark. didnt pull spark plug after. Was getting dark and went in for evening. The neon bulb spark testers can show flash but not sufficient to fire the plug. Is this a new spark plug? You might swap out another plug (especially if the plug in there is a Champion they will sometimes fail to fire under compression) Share this post Link to post Share on other sites
FLtractor 170 #11 Posted June 3 3 hours ago, adsm08 said: Don't forget that a failure of the fuel pump diaphragm will put the whole contents of the tank into the crank case real quick. What are the chances of a brand new never ever ran before aviation grade fuel pump diaphragm failing and that happening? Share this post Link to post Share on other sites
FLtractor 170 #12 Posted June 3 (edited) 1 hour ago, pfrederi said: The neon bulb spark testers can show flash but not sufficient to fire the plug. Is this a new spark plug? You might swap out another plug (especially if the plug in there is a Champion they will sometimes fail to fire under compression) Brand new never used before plug. It be best to throw it away since it most likely got flooded and wet? Any other brand or # you’d recommend instead of champion that won’t fail as often? Edited June 3 by FLtractor Share this post Link to post Share on other sites
pfrederi 20,675 #13 Posted June 3 57 minutes ago, FLtractor said: Brand new never used before plug. It be best to throw it away since it most likely got flooded and wet? Any other brand or # you’d recommend instead of champion that won’t fail as often? Do you have the original plug try it. Share this post Link to post Share on other sites
adsm08 4,562 #14 Posted June 4 11 hours ago, FLtractor said: What are the chances of a brand new never ever ran before aviation grade fuel pump diaphragm failing and that happening? I was talking about the mechanical pump that the electric one presumably replaced. Share this post Link to post Share on other sites
FLtractor 170 #15 Posted June 4 (edited) 2 hours ago, adsm08 said: I was talking about the mechanical pump that the electric one presumably replaced. The old mechanical was leaking.. I left it in place and put the new electrical fuel pump on under the fuel tank pan. Edited June 4 by FLtractor Share this post Link to post Share on other sites
adsm08 4,562 #16 Posted June 5 20 hours ago, FLtractor said: The old mechanical was leaking.. I left it in place and put the new electrical fuel pump on under the fuel tank pan. OK. I missed that part. Share this post Link to post Share on other sites
