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Sounds like you have oil in the gas galleries of the carb. Fill it with gas turn gas valve on and try starting it a few times with starting fluid to help rince/thin them out so gas can flow through them again. It may smoke more than usual for a while. Dont keep it running on the starting fluid though as it has no lubrication for the cylinder/rings and could scar the cylinder walls. If that doesnt work you can remove it and try to do it manually with a can of carb cleaner or get a new carb. They're on ebay for about $20 or a small engine supllier near you will have one for about the same or a little higher.
hi remove the bowl again and get the centre jet out and lok very closely use a jewlers eye piece you wll find a passage that is plugged on the side of the jet look around it you ll see some sign of a hole that is not clear through its pretty small use a welders torch cleanng tool with various size rods use very thin one dont make the hole bigger
This truck is fuel injected, the problem sounds like a weak fuelpump, it runs when you pour gas into it until that gas runs out, the first thing is to test the fuel preasure, if the pump is weak it may run with gas poured into it but wont idle, also a common problem is the coolant temp sensor and the ground wires to thermostat housing bolt but i wont bet its the pump inside the fuel tank, if you put a fuel gauge on it there should be at least 55-61 psi if its a few pounds lower it can cause problems, you have everything else and it runs with gas poured so its a fuel problem check the preasure, theres a valve up top on the fuel line to connect a fuel gauge to it, start there hope this is helpful.
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.
Wait... fuel is pouring out of the crankcase breather? Are you sure it's not the carb overflow tube? The crankcase breather should be going back into your airbox or through some kind of filter.
If gas is coming out of there DO NOT START YOUR BIKE. It means that gas has gone from the tank through the carbs into the cylinder and is now in your oil. Thinned out oil is the devil for bikes.
Sounds like you'll need to clean the carbs and set the float bowl height and maybe rebuild the petcock. Check to see if any fuel is coming out when the petcock is turned off. If it only has on pri and reserve then check for gas in the vaccum tube.,,