Does the small fuel pump under the tank push out a constant flow or intermitant , bike been stood for 18mth got good electrics but cant to get a contstant flow to the carb

Is the petcock "on"? No, I'm not being sarcastic. The filter in the tank (fuel pump) may be clogged. Because you said you have no clogs in the tank, you may have a clog in the fuel line itself. If you take the line off the carbs, does gas flow? If yes, your carbs may be dirty, and the gas is not able to run through the jets properly.

Take the seat off of the bike ,then take the tank loose and gently lift up on the tank ,turn the pet cocktail valve to the off position turning off the gas flow then remove the gas line from the tank and remove the 2 small vent hoses from the tank and set the tank off on the ground.directly under the tank is your fuel pump the line going fro,m the pump to the throttle bodies has a clear capsule shaped filter in it pack a rag under it too catch the gas loosen the clamps and remove the lines from the filter and put the new filter in the same way you removed the old one and reassemble the bike hooking the vent hoses back to the tank and the fuel line turn the gas valve back to the on position and bolt the tank and seat back down and your filter is changed

HI Bridgette,

Due to the different shapes of fuel tank filler necks in cars & trucks, it may be necessary to vary one or more things to allow fuel to flow uninterrupted until the tank is really full.

The main problem can come from the new "vapor recovery" gasoline pumps. These pumps and hoses actually recover gasoline fumes from your tank as the liquid gasoline displaces the air / fumes in the tank is it is being filled. If gasoline flow is started at full blast, it can splash back slightly, causing liquid to be pulled back by the pump - so it shuts off. So, start with a slow rate of filling and gradually increase flow rate to maximum over 5 to 10 seconds. If it still shuts off, try some of the suggestions below.

First, don't fill at maximum flow rate from the pump - that is, don't set the nozzle for wide open. Select one of the other "latches" on the handle instead of the fastest flow and let the tank fill entirely at this rate.

Second, you should experiment a bit with the length of nozzle that you push into the tank's filler neck. If you push it in too far or too little, the pump nozzle can do what you're describing.

Third, try twisting the nozzle slightly so that it doesn't hang straight downward - a little to the left or right may provide a solution.

Lastly, try a different gas station. Their pumps may not be so picky with your tank's filler neck.

Good luck!

the pumps on these are like an old mini electric, the points pitt on them you can buy new points easy to fit, pump under back of tank on frame sod to get to, also there is an inline filter in the fuel pipe it gets blocked and restricts the flow so carbs fill slower than the pump can fill them

Ride the bike until it starts "holding back" or whatever it does. If you think it's fuel level related. Disconnect the fuel line at either the carb or the tank. Turn the fuel on, or if you have one of those vacuum operated petcocks, apply vacuum with a hand operated vacuum pump to open the petcock and test the fuel flow. See if you have a full stream of fuel coming out of the hose. Then fill the tank, and retest. Notice the difference in the flow.

Now, if there is a noticable difference, what is causing it. It could be the petcock screen. I've seen the screens have a "too high" standing pipe for the main fuel supply. The screen has a "pipe" made into it that is usually about an inch above the petcock. Fuel flows down this pipe when the petcock in the "ON" position. When the fuel level in the tank falls below the height of this pipe, the engine sputters and sometimes stalls indicating that you need fuel. But, when you switch the petcock to "RES", another hole in the petcock, which does not have the standing pipe, will open up and allow you to use the remaining fuel in the tank. On a Sporty, this is usually somewhere around a gallon of fuel or about 40 miles or so.

One other thing that could be effecting this the level of the bike. If they has been lowered this could have altered the "level" of the bike. On a Sporty with it's small capacity tank and the shape of the tank, if the has been lower by as little as 1" in the rear, it will cause a problem such as this.

I notice that the bike is a 2010 model. If it's still under warranty, take it back to the dealer and let them figure it out. That's what a warranty is for. But, just in case, keep this things I've mentioned in mind.

Good Luck
Steve

For 1996 Pontiac Truck Trans Sport 3.4L SFI 6cyl check this procedure for Fuel Pump... there are two different electric fuel pumps used:
- A medium pressure twin turbine pump for vehicles equipped with Throttle Body Injection (TBI). - A high pressure roller vane pump for vehicles equipped with Sequential Fuel Injection (SFI).
(see Figure 1)





Fig. 1: View of the fuel pump assembly and related components
The fuel pump is mounted to the fuel sender assembly inside the fuel tank. The fuel is pumped to the engine at a specified flow and pressure by the fuel pump. Excess fuel is returned to the fuel tank by the return pipe. The fuel pump delivers a constant flow of fuel to the engine even during low fuel conditions and aggressive vehicle maneuvers.

CAUTION When working on or near the fuel tank, be sure to observe the information molded on the bottom of the tank.
Removal & Installation

1. Disconnect the negative battery cable.
2. Properly relieve the fuel system pressure.
   

(see Figure 2)




Fig. 2: Exploded view of the fuel pump-to-tank mounting components

1. Drain and remove the fuel tank.
2. Remove the fuel sender assembly.
3. Disassemble the fuel pump strainer and the fuel pump: Note the position of the strainer in relation to the pump.
   

(see Figure 3)





Fig. 3: Remove the fuel tank locking ring with a non-sparking (brass) punch.

1. Support the fuel pump in one hand, and grab the strainer in the other hand.
   1. Rotate strainer in one direction and pull off pump. Discard strainer.
      

(see Figure 4)





Fig. 4: Exploded view of the fuel pump components

1. Remove deflector.
   

1. Disconnect the fuel pump electrical connector.
2. Loosen the two connecting clamps, if equipped.
3. Place the fuel sender assembly upside down on the work bench.
   1. Pull the fuel pump downward to remove it from the mounting bracket, then tilt the pump outward and remove it from the connecting hose or the fuel pulse dampener.
      
4. It is recommended to replace the hose and clamps, if equipped.
   

CAUTION Do not run the pump unless submerged in fuel
To install:

1. Push the fuel pump assembly into the attaching hose. Attach the pump electrical wires and fasten the hose clamps to the attaching hose and around the pump body, where equipped.
2. Place the fuel tank sender and pump assembly into the fuel tank. Use a new O-ring seal during assembly.

Hope this help (remember rated this).

could be a blockage in the tank their is a strainer in most bikes fuel tap look at the tap and see if their is a small bowl shaped cup under the tap if so unscrew it and clean the filter if not try running the fuel from the tank it should flow at a constant rate if it slows then the internal filter may be blocked youll have to take the tam\nk off and remove the tap and clean out the crud

trace the line from the tank all the way up you will run into the pump most likely on the frame

i had same problem turned out to be electrical issue check all your wiring connections under the seat and under your fuel tank and if there all fine try checking that your fuel pump motor is running mine wasnt because of damp on my wiring connectors. when you turn on the ignition the bike should click a few times and your fuel pump should come on look under your tank looks like this with 2 tubes running from your fuel tank http://cgi.ebay.co.uk/yamaha-fzs-600-fazer-00-fuel-pump_W0QQitemZ250559832283QQcmdZViewItem?rvr_id=&rvr_id=&cguid=6d2769071260a0e2048322d3fffcee00
this needs to be running or you will be riding the bike on gravity fed fuel and as soon as you open the bike up you will not get enough to the engine and will cut out hope this helps

yes, it is either the ignition relay which also runs the fuel pump or the feul pump itself is either locked up or just has gone bad. you should charge your battary then try it again and that does not work you can try hitting the feul pump with a small hammer after you have removed it from the tank, this sometimes will get it going again. i've had brand new bikes just out of the crate need a shock to the fuel pump to get it going. it's a contact problem between the brushes and the commutator of the starter motor. something else to look at before toy take the pump assembly out of the tank is to varifey voltage at connector body of the fuel pump under the tank. find an electrical diagram to find out which wires send the voltage to the pump, if you have voltage there at key on then you will have to pull the pump out. hit it with a small hammer on the body of the pump motor and plug the assembly back into the bike and hold the pump upright over a small container to catch gas that may come and turn the key again. if it does not run you will have to buy a new pump.