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Thread: Bandit 250 "runs out of fuel"

  1. #1
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    Bandit 250 "runs out of fuel"

    So i got a new bandit, (a 92) and sometimes at higher speeds circa 110 it "runs out of fuel" like it just loses all power and i have to pull over and start it again after 30 seconds or so of waiting. it seems to do it less when set to reserve and sometimes only runs if set to prime, also when you "floor" it (twist it?) instead of accelerating smoothly like it should it just gets noisy. any ideas?

  2. #2
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    It does sound like it's running out of fuel at sustained high revs. Basically the idea is to check it can piss out fuel as fast as it needs to. Check for:
    • Blocked tank breather
    • Blocked fuel tap, give it a good clean out, you can dismantle them easily enough
    • Blocked fuel line
    • Clean fuel rail/carb delivery system
    • That there's any crap at all in the tank or float bowls


    Had the same problem with a very shitty FZR400 that was lying around for ages. Rust in the tank was blocking things up.

  3. #3
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    i do wonder if its in the tap, because of it working better in reserve than in on. i opened it up today tho and didnt really know enough to do anything how would i go about cleaning it out? also there was air in the fuel filter, is that ok?

  4. #4
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    Quote Originally Posted by vindy500 View Post
    i do wonder if its in the tap, because of it working better in reserve than in on. i opened it up today tho and didnt really know enough to do anything how would i go about cleaning it out? also there was air in the fuel filter, is that ok?
    Reserve should be worse, if it's a blockage in the intake, because it draws from lower than main. Air in the filter just suggests what we know already....the fuel is feeding slower than it's being used. I'd suggest it is a problem with the vacuum hose/system that opens the fuel tap when engine is running. The 'running well on prime' is a big clue...because the prime position bypasses the vacuum section in the tap.
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  5. #5
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    If you shake the bike tank around when its hot does it hiss from out under the fuel cap? Does the fuel cap let a rush of air in when you open it?

    I had a bike do this and it was the tank vacuuming down. It did it mostly on sustained climbing or high speed, and particularly so in cold weather. We modified the filler so it vented slightly. Aparrently this is not a legal mod in the US. Lucky I aint in the US.

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  6. #6
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    yeah seems to run sweet in prime, in fact today the only way to get it to run alright was in prime, so vacuum, what should i do about it?

  7. #7
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    Quote Originally Posted by vindy500 View Post
    yeah seems to run sweet in prime, in fact today the only way to get it to run alright was in prime, so vacuum, what should i do about it?
    Fix it.
    I don't know how tho...
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

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    Quote Originally Posted by vindy500 View Post
    yeah seems to run sweet in prime, in fact today the only way to get it to run alright was in prime, so vacuum, what should i do about it?
    Feckin' useless fancy-arse vacuum fuel taps.

    Buy a bike with a proper fuel tap (i.e. On/Off or On/Off/Res) and don't be a dumbarse and forget to turn it off if your float valve leaks....

    I suppose check that the vacuum hose isn't leaking at all, that the wee diaphragm is sealing all right.

  9. #9
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    Quote Originally Posted by xwhatsit View Post

    I suppose check that the vacuum hose isn't leaking at all, that the wee diaphragm is sealing all right.

    How?

    char

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    I'd pull it to pieces and check it's whole and not perished but I'm not too bright about things like this

  11. #11
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    ok just to confirm, on the petcock theres 2 hoses coming off it, one going through a fuel filter the other one not. is that the vacuum hose? or is the vacuum hose the one coming out of the tank on the otherside which goes to a T junction and i havent bothered to follow it any further?

  12. #12
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    The vacuum hose is the smaller diameter hose coming off the fuel tap. It goes to the inlet side of one of the carb bodies.
    Do you realise how many holes there could be if people would just take the time to take the dirt out of them?

  13. #13
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    Quote Originally Posted by vindy500 View Post
    i havent bothered to follow it any further?
    So ummm do you want us to do it ?
    Tank off , tap out , check no rust coming out of tank ! Follow vac and check it has no holes or splits !
    A girlfriend once asked " Why is it you seem to prefer to race, than spend time with me ?"
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    Quote Originally Posted by vindy500 View Post
    ok just to confirm, on the petcock theres 2 hoses coming off it, one going through a fuel filter the other one not. is that the vacuum hose? or is the vacuum hose the one coming out of the tank on the otherside which goes to a T junction and i havent bothered to follow it any further?
    So take it down a dark alley and kick the shit out of it.

    Some people are only alive because it is illegal to shoot them.

  15. #15
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    Quote Originally Posted by MSTRS View Post
    The vacuum hose is the smaller diameter hose coming off the fuel tap. It goes to the inlet side of one of the carb bodies.
    thats what i wanted to know

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