Fuel Overflow 2001 FI Model?

sexyh

Hi, i own a 2001 Fuel Injection model and do smell fuel when i switch off my engine. I wonder whether the FI model have overflow valves like some carb bikes do. Use to own some previous carb. bikes and they do have overflow problem when they are not properly maintained.

Bought this BB 2 months ago and found that it only clocked 210 km/l till the reserve blinks comes on. Sent it for a check and found that the air filter (all clogged) filthy. Took out the Throttle chamber and found clogged up fuel residues and black dirt. Eventually did a syncronisation of the fuel injectors, clean up both the air filter (K & N) and washed the throttle chamber up with clean petrol. Now the bike gives me about 250-260 km/l (a little better).

Still i feels that the mileage is average, so could there be fuel overflow problem when my bike is switch off and i might not have realise it cos that is when i am not around my bike, or could the problem be something else?

Anyone care to help me in this? I really have no idea for a solution?

shovelstrokeed

No float chambers on EFI bikes so no overflow tubes. I would look for a leak. The system pressure is somewhere around 3 bar, 42.5 PSI, and, if everything is not just right, you could be leaking. Suspects would be the banjo bolt where the fuel line goes from the tank to the fuel rail, any of the O-rings sealing the injectors to the rail, the fuel pressure regulator on the right end of the rail and finally the return line from the regulator to the tank.

Also, your fuel consumption figures make no sense. The low fuel light illuminates on my bike when I have burned about 5 gallons of gas. That occurs at 180 miles, give or take a bit at 83 mph GPS running speed. That would equate to 36 miles per gallon. That would be about 290 kilometers per tank, not per liter. I think most folks who use metric measurements use liters/100 km. Doing that conversion would give 6.53 l/100km

sexyh

Thanks for spotting my mistake. Actual present consumption is 250-260km from full tank till 1st reserve blinks. At that point i usually tops up about 17.5 litres of petrol. Think it works out to about 14.2km to 15km per litre. How is that figure, good or bad?

I saw from that Service Manual about the fuel pressure regulator. Does that piece of equipment gives problem. Is there a way to test the this item out and is it difficult to check it for faults. When should one replace such item, etc.

Thanks shovelstrokeed, will check the banjo bolt and other fuel fittings.

shovelstrokeed

Download the service manual and parts fiche available at the Resource Center portion of this forum. A wealth of information in there, including how to test the fuel pressure regulator. Yes, there have been some problems with it but usually they are associated with rotting diaphragms due to alcohol in the fuel here.

rodantking

Had that problem the other day. Turned out it was just me.

Frank851

Take note that if you do not use fuel stabilizer and the bike is stored for any length of time the gasoline will degrade. When you run bad fuel (old gasoline without fuel stabilizer) through your injectors it may cause them to fail open (instead of cycling open and closed). This usually occurs in one or more cyclinders and gasoline may actually run through the motor and out of the exhaust pipe when this happens. If you have old fuel in your tank do not run it through the injectors as this can cause the injectors to fail open and damage your motor, usually the head, as the cyclinder being overfueled will lock up hydraulically and may cause a bent valve. Removing all the gunk from the gas tank, fuel pump, fuel injectors, the fuel rail, and inspecting the valves after a leak down test is expensive. The fuel filter will not stop this from occuring when bad fuel is burned. For those of you buying a used bike with really low miles I would recommend changing the fuel immediately if the previous owner did not use stablizer. Low miles on a bike that is several years old with no use of stabilizer means that the conditions are good for this type of failure to occur. Deposits from burning bad fuel also accumulate as a hard crusty material on top of the valves - not the best thing for optimum flow. I always use a stabilizer additive in my tank before parking it if I know I'm not going to burn a tank of fuel within a 1 month time frame or less.
Frank851

bullet

....only tank fuel overflow tube under tank...check also the fuel return tube from the injector manifold to the tank

sexyh

OK, will do that. By the way to all, i have since changed the fuel regulator to a new one. The fuel consumption is still on the high side.