I added a bit of bad fuel to the tank and still the bike ran fine that day. The next day i went to start it up and it wouldn't start. I emptied out the gas, checked the fuel and air filters, and even added fuel treatment with a bit of new clean fuel and the bike still won't turn over. My spark plugs should be good since they were recently replaced. Any suggestions before i take it to a shop?
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Re: I added a bit of bad fuel in the tank
Hi and welcome to FixYa,
Initially, try to drain the carbs themselves. Each carb has a drain screw at the bottom specifically for this purpose. Just turning these drain screws a couple of turns counter-clockwise would allow the fuel inside the bowl to drain out through a hose. Normally, I do it with the tank's fuel valve open (PRI) so as to enable the gas to flow freely, the fresh gas to wash the inside of the bowl and prevent the float from sticking in the open position. In some instances that the the tank's fuel valve open is closed when doing this, the carb has a bad habit of overflowing. Of course care and safety should be in mind as raw fuel would tend to be draining out.
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fuel petcock screen may b clogged or u may have a soft fuel line n it's collapsing. drain tank n remove petcock n replace fuel lines it's a good idea to do every year with this crappy gas these days it eats everything.
You should have the injectors cleaned, As fuel gets old, the most burnable part of it evaporates This leaves a very liquid gunk behind, the gunk contains some very big bits of rubbish, (compared to clean fuel or injectors) it sounds as though you have blocked injectors. If you give them a good clean and fill the tank with new fuel you should fix the problem.
It sounds like one of two things. One, the jets in the carb may be clogged. The way you're describing it, it sounds like the main jet in the carb is clogged. You're running off the slow speed jet. When you open the choke (enricher) you're adding a bit more fuel and air improving the performance a bit. If it's te carb, it needs to be completely disassembled and soaked in a professional quality carb cleaner and thoroughly gone through to ensure all passageways are clear.
The next problem is the exhaust system. I've seen bikes do this before when changing a camshaft. Remove a stock cam and install a high performance cam and the bike will no longer run. The reason is that the baffles in the exhaust system were so restrictive that the engine could no longer "breathe" with them in there. Removed the baffles and the engine ran fine but was too loud for the owner's liking. We replaced the stock system with a free flowing high performance muffler system and the bike ran great.
You have two pumps,I guess you know that ,if you already did one. Did you check fuel pressure at the rail and check out the electronic pressure regulator? What codes are coming up and do they stay set?
DRAIN CARBS FROM PETCOCK AT BOTTOM OF EACH CARB MAKE SURE FUEL DRAINS COMPLETELY THEN TURN FUEL BACK ON, IF THIS IS AN INJECTED MODEL DRAIN TANK AND FLUSH THEN RUN IT HARD FOR 20 MILES OR SO, MAKE SURE YOUR OIL LEVEL IS OK
If it is an electrical Fuel Pump, you will hear the pump whirring as soon as you turn the key to "ON". If you can't hear it, the fuel pump is bad. If it is a mechanical fuel pump on the engine, remove the hose that goes into the carburator. And crank the engine. It should pump the gas out without a problem. If it does not, the fuel pump is bad. Also check the relay to the fuel pump and the shutoff valve. It is more likely that it is a relay problem since it hits a bump and goes off then it carries a current again. Probably a bad relay under the hood for the fuel system.
if you have an electric fuel pump that would explain the hum. unhook your incoming fuel line and blow the line clear, sounds like you've got some junk in your tank.it'll build up on the screen in the tank then fall off (at least partially) when your making turns or hitting bumps or holes. next time it's only got a gallon or so of fuel i'd drop the tank and check the pickup tube inside. sux but that's the only way to get to it. while you've got the tank off and out from under the jeep, might as well clean it out real good and replace anything inside (usually the screen) that doesn't look right, dirty etc. wouldn't hurt to run a bottle of fuel system cleaner in the next full tank of fuel either. preferably as soon as you put your tank back. good luck
What u are describing is typical of a faulty ignition system, but could also be a fuel problem. I check by removing the aircleaner and rotating the throttle. If u see a nice spray of fuel, thats probably not the problem. Check for a spark at the plugs. I can explain how if you need me to. If you cant see a good spark, U have an electrical problem. I had a crank position sensor go bad on me. Dont do what I did (replaced the battery, ignition, and regulator as part of my diagnosis procedure)