Sudden misfire and its not due to rain

[CRH]

no mate!!....inlet manifold vacuum will sort that out!! as you crank it will suck it through!!

[Bracechenko]

no mate!!....inlet manifold vacuum will sort that out!! as you crank it will suck it through!!

:thumbup

[red98]

[quote author=CRH link=topic=4131.msg34546#msg34546 date=1344805610]
no mate!!....inlet manifold vacuum will sort that out!! as you crank it will suck it through!!

:thumbup
[/quote]




back in the good old days of my youth,with bikes that are now called "japanees classics"you would`nt have a pump just gravity, tank on top of carbs and as crh has already said the vacuum generated from induction should be enough,not saying run it like that just a test to see if pump is faulty  [size=78%] [/size]

[Bracechenko]

Ok an update....

The tank is off and i've removed the in and out fuel hoses from the fuel pump. Now, am i right in thinking that if i turn on the ignition with the bike as it is, the fuel pump should try to pump fuel yeah?

I ask because that's exactly what i did and it didnt do anything at all. The next step is to bypass the pump and see if the bike runs i know but if my understanding is correct, hasnt this already proved that the pump is faulty?

[Dead Eye]

Could this be a separate issue that has surfaced? If the fuel pump was knackered you wouldn't get one cylinder firing let alone 3, right?

[richfzs]

Could this be a separate issue that has surfaced? If the fuel pump was knackered you wouldn't get one cylinder firing let alone 3, right?

See

Oh yeah, forgot to mention that it doesnt run at all now! I'll check the filter but shouldnt i always hear the fuel pump click when turning on the ignition if its been left for a day or so?

[Bracechenko]

As Rich has pointed out, no cylinders fire at all. So, am i right in my thinking that the pump should spin if it wasnt faulty?

[CRH]

the fuel pump could still be ok?.....you also have a fuel pump relay"....that could have gone down??...thats located under side panel on my foxeye!...thats l/hand sitting on bike!!...should be same on yours ide think?.....

[Bracechenko]

How do I check if it's the relay or do I just Gabe to replace to know. I don't have a multimeter :-(

[richfzs]

Yes I think so - unless it's already got back pressure from the carbs, so that it thinks the float bowls are full (in the way that it doesn't click away when you turn the ignition straight back on after switching off).

But having just read your post again properly  :rolleyes :rolleyes :rolleyes :rolleyes :rolleyes I see you've taken pipes of both sides - so yes, I would have thought it should be clicking like a clicky thing.

There's a 2nd hand pump on fleabay for 40 notes, which seems like a lot, but they're asking 80 for new ones  :eek :eek :eek

[CRH]

How do I check if it's the relay or do I just Gabe to replace to know. I don't have a multimeter :-(

............right!!....firstly find the relay"..then unplug it and make sure all the contacts are clean..spray wd or whatever you got handy on it?....then plug it back on!!....then switch ignition on and you should here it energise ie click"....if it dont its sus??....if it does then bk to fuel pump???......

[richfzs]

If you can't hear the relay energising, it's worth keeping a finger tip on it - you might feel it moving, if not hear it.

[Bracechenko]

Ok so i can hear the relay energise so guess the pump is duff. I did bypass the pump in the end and the bike fired up first time so at least we know there's no wider issues.

Thanks for helping me with this peeps, having my commuter bike off the road is annoying. Seems like the pump is at fault so gonna get a replacement pronto 

[CRH]

ask on here brace"...someone might just have one they will part with?

[Bracechenko]

ask on here brace"...someone might just have one they will part with?

Too late, bought a used pump from fleabay now for £30, guaranteed at least :\

[red98]

yes thats right...with both pipes removed it should click like crazy it will only stop when the float bowls are full and fuel pressure increaces,as you have disconected both pipes theres no pressure build up so pump will continue ticking.....to test the pump without the relay ,disconect the pump from the loom and run 2 fresh cables straight to the battery this will tell you if the pumps a good un or not.......hope that makes sense 

[CRH]

good price that!! ........

[red98]

oooops...sorry took me a while to write that...sounds like you`ve solved the problem.....let us know how you get on 

[Bracechenko]

oooops...sorry took me a while to write that...sounds like you`ve solved the problem.....let us know how you get on 

Cheers anyway Red 

[Bracechenko]

Final update then....

The replacement pump arrived today and looked very clean and in good condition so pleased with that. Fitted it to the bike and it's all now working as it should do so problem solved 

I've even topped up the oil and set the tyre pressures as i want, cant wait to get the old girl back out on the road!!