Good day All I have a technical question about the SU carbs of my 1966 Triumph Spitfire MK 2. I recently replaced the fuel pump (New) and since then there is petrol pouring out of the carbs. I've done the following already but to no avail: 1. Replaced the needle and seat 2. Set the floats in accordance to spec 3. Replaced old fuel hoses with new once Please can you advise me on what else I can do to fix this problem thanks David
The little plastic /rubber bit has come off the shut off valve ,although you have no doubt found this out by now .
SOURCE: Rear Carb leaks fuel out of the overflow tube 1995 Suzuki VS 1400 Intruder
Hole in the float. It fills with gas, sinks and fails to stop the fuel flow
SOURCE: honda shadow vt600 dumping fuel into the carbs
Hello ddsaul2...If it's only been a day since the shop adjusted the carbs. you need to return it to them and make them do it right.
Sounds like a float valve is stuck and not closeing.They may have cracked a seat... There could be a pin hole in one of the floats causeing it to fill up with gas and sink. You can check and make sure all the vacuum lines are connected and possibly GENTLY tap on the carb fuel bowls to see if the float might be stuck alll the way down. Personally...if i paid for a carb tune i'd make them fix it. Surely they gurantee their work.
Good luck...i hope this helps
SOURCE: I bought a 1985 GS 550 LF. It had been sitting
Gas pouring out of the carbs means the float pin are not sealing in thus the over flow.
Go a little down thn .77in , best would be to bench set them.
Take a pipe say from the tank to the feed pipe of the carbs (best would be to remove the tank and place it higher on your work bench to get the gravity flow to the feed pipe of the carbs)
Allow the flow to the carbs and monitor the over flow, see which carbs over flow, remove the float bowl and reset the float and let it go a little less thn .77in, refit the bowl and retry the feed in and recheck..you will come to a point where gas wont over flow, open the bowl and see the level of the gas , it should be covering the jets, but remember that since you will have the float bowl out the gas will show low as when its submersed, the jet stem in the float bowl pushes the gas level up so dont get mixed up when you see the level low , i am sure you will be able to judge it for yourself.
I had the same problem in myYamaha(seca) XJ750R !981and finally managed to win over the problem going over it the way I explained.
Hope this helps! Good luck.
SOURCE: Fuel leaking from carb vent tube on newly cleaned carburetor
that would be either the float set to high or the needle and seat is missing an o-ring while you had it apart. Should look at getting a carb kit there only approx. 23 bucks and it would save you a lot of grief in the long run.
SOURCE: Air box and crank case fuel flooding problem
Well there only one way the fuel can get into the crankcase and that's from the fuel tank. The petcock must be draining and the float needles are not stopping the fuel flow. Do you have a prime position on the petcock? If so do not run the bike in the position. Try topping the tank off with gas and letting it sit for a while and see is the gas has gone down and then check the crankcase and see if there's fuel in it again. i still say its got to be your petcock.
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