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Help Suzuki Across Fuel Pump Issues

Discussion in 'Suzuki 250cc In-line 4's' started by Aesirvanirjotna, Oct 22, 2019.

  1. Aesirvanirjotna

    Aesirvanirjotna Member

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    Hi all,

    I have an across that has been sitting in storage for a couple of years and am finally getting around to trying to get it running again.

    Shortly before going into storage I had a few issues getting it started which had made me think it was not getting fuel. I thought it might need the carbs overhauled but due to personal reasons it ended up getting put aside.

    Testing today I noticed that while the fuel pump was happy to pump into a bucket, it would only pump once or twice before cutting out when I connected the pipes back into the carbs and definitely not enough to prime them considering they’re bone dry from a couple of years sitting.

    Priming the carbs manually (putting some petrol in them to get them going) allowed the bike to start up but the pump still didn’t keep up with them so it died after using up the fuel I put in.

    Am I right in thinking that it probably needs a new pump and not necessarily a carb rebuild?
     
    Aesirvanirjotna, Oct 22, 2019
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  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Float needles are probably stuck from sitting. Had the same problem with a VTR250 at work.
     
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    Linkin, Oct 22, 2019
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  3. Aesirvanirjotna

    Aesirvanirjotna Member

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    Would that increase the pressure and make the pump stop priming them properly?

    Sorry if that’s a stupid question, I know very little about carburetors...
     
    Aesirvanirjotna, Oct 22, 2019
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  4. kiffsta

    kiffsta Senior Member

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    I’d drain the bowl and see if any fuel made it in there , if your across has sat for so long , you are going to have to strip and clean this carbs
     
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    kiffsta, Oct 22, 2019
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  5. Aesirvanirjotna

    Aesirvanirjotna Member

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    Aesirvanirjotna, Oct 22, 2019
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  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    The pump doesn't sound like it's working properly either.
    I would have thought it will keep pumping when it just has a hose coming off into a bucket.
    Normally they'll only stop when they reach preset pressure if it's like an FZR fuel pump.
     
    my67xr, Oct 22, 2019
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Oct 22, 2019
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  8. kiffsta

    kiffsta Senior Member

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    Same as a fizzer , if there is no back pressure the pump will keep going , once it reaches a certain pressure it stops

    if the bowls have fuel in them the pump will click then stop

    @Aesirvanirjotna the team ghetto write up is pretty good
     
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    kiffsta, Oct 22, 2019
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  9. Aesirvanirjotna

    Aesirvanirjotna Member

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    Yeah it does pump constantly when it’s pumping into a bucket but stops pretty much straight away when connected to the carbs even though they’re empty.

    So it’s likely not the pump then? Does that mean that the carbs are just too gummed up to allow the pump to get any fuel in and thereby providing enough back pressure for the pump to cut off?

    Also, if I grab both Kit A and Kit B from the link @GreyImport provided will that cover everything or should I replace more while I’m at it?

    I have a 20L ultrasound tank at home so I can run everything through that while cleaning if that’ll help.
     
    Aesirvanirjotna, Oct 22, 2019
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  10. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

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    Are you 100% sure the carbs aren't empty? The pump won't stop unless it's got back pressure.
     
    Cbuzz, Oct 23, 2019
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  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Ok, i must have read your first post wrong after looking at it again sorry.

    If the carby's are blocked with dried gum etc, so much that it won't let fuel past the needle and seat's, i reckon they need a full strip and clean out in your ultrasonic cleaner.
    You'll only really know what else you need once it's all stripped and clean (diaphram's are split if they use them), it'd pay you to replace the needle/seat's as the rubber tip's on the needle's will be rock hard and won't seal properly.
    Possibly need jet's if they're damaged/butchered, and possibly a set of screw's for the carby's, top cap's and fuel bowl's
     
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    my67xr, Oct 23, 2019
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  12. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    I would guess that the lines/passages are blocked with dried up fuel and any small filters/screens will be blocked too. Sorry to say a full strip and rebuild is required, and I would be replacing the fuel lines as well.
     
    Murdo, Oct 23, 2019
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  13. Aesirvanirjotna

    Aesirvanirjotna Member

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    Ok so I’ve ordered the Litetek kits aswell as their fuel tank seal which looks like it should fit the petcock/fuel tap. Also ordered a new battery since I seem to have lost the old one and it likely would have had it by now anyway.

    @my67xr are the needle seats/rubber tips included in one of the litetek kits, or is that something I need to get from somewhere else?

    I think I’ll clean out the tank and take out the carbs today to start cleaning.
     
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    Aesirvanirjotna, Oct 23, 2019
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  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  15. Aesirvanirjotna

    Aesirvanirjotna Member

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    Thanks for all the help and suggestions so far guys!

    Ok so I got the carbs off today and have started cleaning them up. Is it a good idea to throw the whole assembly into the ultrasound or will that damage the floats and sliders?

    Also the main jets seem pretty clear but I can’t see any light through the pilot jets at all, is the hole just too small to see through or should I be able to see light shining through them too?
     
    Aesirvanirjotna, Oct 23, 2019
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  16. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Should be able to see through the pilot jet's, some have small holes across them too, not sure about your's
    Pretty sure carby's should be stripped right down before ultrasonically cleaning them, but some one that's done it will reply soon.
     
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    my67xr, Oct 23, 2019
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  17. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Yes, take everything out of the carb bodies and put only the bodies and jets through the ultrasonic cleaner. Wash the rest in petrol.
    You should be able to see daylight through all the jets. If still not clean after that then buy a can of Threebond from auto parts shop and let them soak in it for a couple of hours.
     
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    Murdo, Oct 23, 2019
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