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  #1  
Old 6th December 2017, 02:19 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Unhappy Bros 400 possible fuel pump issue

Hi lads, have myself a bros 400 here and it's recently started breaking down on the road. First I thought it was a battery problem but doubtful now as it starts to lose power and has started backfiring recently. It chugs to a stop and cuts out. She turns over fine but won't fire. End up having to get trailered home. In the shed now won't start at all. I'm thinking fuel starvation, possibly a fuel pump fecked? Any suggestions where to go from here? I'm fairly clueless when it comes to the whole mechanical side of things. Would it be best to bypass the pump to see if it's the pump itself? Any suggestions appreciated cheers
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  #2  
Old 6th December 2017, 02:36 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Or would it be the fuel pump relay?
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  #3  
Old 6th December 2017, 03:49 PM
yzfr1jon's Avatar
yzfr1jon yzfr1jon is offline
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Biker.ie Member No. 3977 from PortLaois/Derry etc...
818 posts since Nov 2006
Motorbike: SRX608,GileraRunner SP50,FZ750 in bits
Modifications: Cable ties, Duct tape+carbon.....
Default Re: Bros 400 possible fuel pump issue

Have you opened the filler cap to make sure the tank is not airlocked? You should hear pump prime. Otherwise get a short length of fuel hose and bypass the pump completly, bike will runn and you'll know that the pump is knackered
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  #4  
Old 6th December 2017, 04:05 PM
Pablo Diego Jose Francisco de Artist Pablo Diego Jose Francisco de Artist is offline
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Biker.ie Member No. 37756 from Red Lake, On.
88 posts since Oct 2017
Motorbike: BMW K75c, KTM 300xcw
Default Re: Bros 400 possible fuel pump issue

Check for spark too. Coils may sometimes fail intermittently, and then absolutely.
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  #5  
Old 6th December 2017, 05:42 PM
Error52 Error52 is offline
Clubman
 
Biker.ie Member No. 36619 from Westmeath filter champ
211 posts since Sep 2016
Default Re: Bros 400 possible fuel pump issue

Can you check the float bowls by opening the drain screw to see if it's empty?
And check the battery is good too

If it does turn out to be the fuel pump you should look up the SV640 vacuum pump mod for the bros.
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  #6  
Old 6th December 2017, 06:06 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Thanks for the help lads appreciate it, I bypassed the pump with a gravity feed and a short piece of pump and she ran not a bother! So does this defo mean the pump is knackered or could it still possibly be the relay? Should i bypass the relay directly to the battery to see does the pump work and then I'd know if it was the relay or does that make sense. New battery put in only a week ago error 52 sound
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  #7  
Old 6th December 2017, 06:06 PM
Brosbiker Brosbiker is offline
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Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Have spark all round also
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  #8  
Old 6th December 2017, 06:16 PM
Error52 Error52 is offline
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Biker.ie Member No. 36619 from Westmeath filter champ
211 posts since Sep 2016
Default Re: Bros 400 possible fuel pump issue

https://www.hawkgtforum.com/forum/ho...-install/page2

suzuki SV650 vacuum fuel pump mod if you go that way

https://www.google.ie/search?q=honda...TzpoQ1cfj9i_M:
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  #9  
Old 6th December 2017, 06:32 PM
Doomdom Doomdom is offline
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Biker.ie Member No. 31714 from near Duleek
227 posts since Jun 2013
Default Re: Bros 400 possible fuel pump issue

I can see that bros use same pump as Duville. Those pumps last 40-50k Km.
Open a back of the pump and there is a point switch inside. If points worn out, pump will stop working. You can replace them. Its easy job and new point switch is 20 on ebay.
http://www.ebay.co.uk/itm/Honda-XRV-...UAAMXQ01tRXXJ7

But before you buy anything check relay as well just to be sure.
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  #10  
Old 6th December 2017, 06:46 PM
DavyH DavyH is offline
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2,046 posts since Dec 2014
Motorbike: Cb,Vtr,Xrv,Nt
Modifications: A few bits and pieces!
Default Re: Bros 400 possible fuel pump issue

It could be the relay but they are quite reliable,the wiring can cause issues though...but my money would be on the pump. Usually the contacts fail and can stick,you can replace them but it's 50/50 on the pump being burnt out. You can run it on gravity feed but you won't get the last few litres from the tank so you'll need to keep it topped up, alternative is to get an sv 650 vaccum pump or you can get a tourmax genuine mitsubishi replacement that runs the correct flow rate. Some lads go with facet but I've had trouble with them in the past so I don't recommend them anymore
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  #11  
Old 6th December 2017, 07:01 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Excellent lads fair play, I'll go have another go at it and I'll give yous an update
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  #12  
Old 6th December 2017, 07:04 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Cheers Davy, that was my next question, regarding the flow rate. Came across a few different types, the one on it is a mitsubishi one so I'll go with the same again
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  #13  
Old 7th December 2017, 11:25 AM
ehonda ehonda is offline
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Biker.ie Member No. 28844 from Dublin
262 posts since May 2012
Motorbike: NC25, NC30,NC35 MC22,RC31
Default Re: Bros 400 possible fuel pump issue

One way to test the pump is to bypass the relay which should force the pump to start.

https://imgur.com/BcVzP98
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  #14  
Old 17th December 2017, 01:27 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Brought it to a garage that told me it was only the point switch on the front of the fuel pump so a new one was ordered and it was replaced. Still no joy. Can someone tell me the best place to bring it or know anyone on here that could take a quick look? Thanks lads
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  #15  
Old 17th December 2017, 01:44 PM
DavyH DavyH is offline
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Motorbike: Cb,Vtr,Xrv,Nt
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Default Re: Bros 400 possible fuel pump issue

Originally Posted by Brosbiker
Brought it to a garage that told me it was only the point switch on the front of the fuel pump so a new one was ordered and it was replaced. Still no joy. Can someone tell me the best place to bring it or know anyone on here that could take a quick look? Thanks lads
Where are you based,i have an old pump here you.can try
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  #16  
Old 17th December 2017, 07:58 PM
H1500 H1500 is offline
Clubman
 
Biker.ie Member No. 27876
129 posts since Dec 2011
Motorbike: K1200S H1 500 R1100S FLHR
Modifications: Expansion pipes
Default Re: Bros 400 possible fuel pump issue

Why do you believe it is the fuel pump?
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  #17  
Old 17th December 2017, 10:16 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Cheers Davy, based in blessington in Wicklow not far from Tallaght.
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  #18  
Old 17th December 2017, 10:17 PM
Brosbiker Brosbiker is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 37733
18 posts since Oct 2017
Motorbike: Honda bros 400
Default Re: Bros 400 possible fuel pump issue

Have you any other suggestions H1500? Be glad to take them on board, I'm just going by what others have told me
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  #19  
Old 19th December 2017, 06:58 PM
H1500 H1500 is offline
Clubman
 
Biker.ie Member No. 27876
129 posts since Dec 2011
Motorbike: K1200S H1 500 R1100S FLHR
Modifications: Expansion pipes
Default Re: Bros 400 possible fuel pump issue

Hi Brosbiker. For the engine to run it need fuel air and a spark in the right quantities at the right time. (before everyone jumps in I know that yes it needs compression and other stuff). To troubleshoot the problem there three things need to be checked.

1) Is the air intake and filter etc. all clear (I have seen air filters block/collapsed many times)
2) Are the airbox to engine connections all reasonably tight to make sure there is no large leakage.
3) Do you have spark?
4) If you have a spark is it occurring close to TDC?

Try checking those and let me know how you are getting on. I am near Naas and could help you out over Christmas sometime if you cannot get it going before then.
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  #20  
Old 19th December 2017, 09:24 PM
Blanka Blanka is offline
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Biker.ie Member No. 5983
1,161 posts since Jun 2007
Motorbike: fazer
Default Re: Bros 400 possible fuel pump issue

He said when he took the pump out and gravity fed it it ran fine so seems like he's already diagnosed it. The pump is bad and needs to be replaced

Last edited by Blanka; 19th December 2017 at 09:27 PM.
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