mr henderson
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| posted on 24/3/09 at 05:33 PM |
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Blade carbs full of petrol!!!!!!!
I've been working on a 'blade engned se7en, and the time has come to start it up. The tank is fitted with an adapted Sierra pump/sender
unit, I assume it is from a fuel injected car as it has a return inlet as well as the outlet.
I managed to get the engine started, then stopped it to let the fumes clear, and after a while I notinced that 3 of the the inlet trumpets were half
full of petrol.
I noticed that there is no pressure regulator fitted (the engine and fuel system were not part of my brief), and I wonder if maybe the pump is forcing
fuel past the valves in the float chambers?
Any info welcome
John
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jake_truck
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| posted on 24/3/09 at 05:41 PM |
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I think you need to use the fuel pump from the bike as it self regulates the pressure. You may be able to use various different bike fuel pumps. I
am using a zx6r pump for zzr1100 carbs, soon to change to zx9r carbs. I don't think the type of engine ,ie car or bike makes a difference.
I used a bike pump with weber twin choke carb for sva, it worked perfectly, and drives very well.
regards
john
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Paul TigerB6
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| posted on 24/3/09 at 05:42 PM |
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I had a similar problem with a set of GSXR carbs where the float valves werent shutting off and it forced fuel up out of the pilot jet and air vents.
I found the floats and valves had been reassempled incorrectly - the metal tab on the floats wasnt able to touch the float valve correctly. Worth
dismatling and cleaning the parts anyway if a soak overnight (to swell a possibly dry o-ring) doesnt improve matters.
As above though - ideally the car needs a self regulating bike pump which only gives about 1.5psi pressure
[Edited on 24/3/09 by Paul TigerB6]
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DarrenW
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| posted on 24/3/09 at 06:06 PM |
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If pump is from injected car then defo too powerful and cause of too much fuel.
Using bike pump from similar cc (as the carbs) bike will cure it.
Ive even had similar when forcing fuel into a 38DGAS via a facet red top.
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DIY Si
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| posted on 24/3/09 at 06:27 PM |
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Sounds like the pump is running at too high a pressure and flooding it all. Even some of the carb specific pumps are too much for bike carbs, as they
seem to like not much more than 2 psi.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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Jon Ison
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| posted on 24/3/09 at 06:30 PM |
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Defo go for the bike pump, you may just get away with a regulator on the pump you have but 99% of the time this dont work either as you have to turn
the pressure down so much you get all but zero flow.
I bike pump gives serious flow at very low pressure.
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lotusmadandy
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| posted on 24/3/09 at 07:25 PM |
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You will need a bike pump as the car pump will supply about 7psi and the bike carbs only need about 1.5-2 psi.
I tried to use a regulator with a car pump on my zzr carbs but the pump overcame the regulator and flooded out the carbs.
Andy
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