85 LT 125 fuel pump issue - Suzuki ATV Forum
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post #1 of 4 Old 04-13-2010, 10:22 AM Thread Starter
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85 LT 125 fuel pump issue

Hey everyone...I seem to be having a fuel pump issue and looking for some recommendations. I recently bought this machine cause it wasn't running right.

Before I start, let me say I know this is a fuel pump issue cause I can use another tank that's gravity fed and the thing runs fine, so I know it's not a jet or float issue.

I can use the prime bulb to get fuel to the carb, but it will only idle. It will bog/kill the motor if I give it gas. I can take compressed air and a rag and prime the system through the gas cap opening and it will run fine for about 10 seconds, then only idle. I know the vacuum line is sucking from the intake and have taken the fuel pump apart, cleaned, and everything appears to be fine. The only thing I am uncertain is a ball bearing and spring unit in the pump. I would think this is some type of check valve.

I'm uncertain if this pump has been taken apart before, so I ordered a clymer manual hoping it has a break down of the pump so I can reassure it was pieced together properly. I'm thinking it looks line cause if the ends were reversed, the fuel lines would be ran a little funky.

Has anyone ran into any related issues like this?

Thanks in advance!
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post #2 of 4 Old 04-27-2010, 03:31 AM
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^ man spam.... anyway. better to replace the whole assemble to so that you would have a piece of mind. yes it is expensive but worth it.
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post #3 of 4 Old 11-26-2010, 05:56 PM
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how does this vacuum operated fuel pump work? from what I can tell all the vacuum does is allow fuel to pass through which would basically be more like a flow control valve. I took a vacuum pump to mine and fuel started flowing through it. take the vacuum off and fuel flow stops. so why do they call it a pump? I think it's more of a safety valve in which it keeps fuel from flowing unless the engine is running which isn't a bad thing, I just don't think they should be calling it a pump if it's not. and that also go to show why the gravity fed tank worked fine when WFOWS6 hooked it up. basically the tank with the so called fuel pump is actually gravity fed also. just bypass the pump that isn't a pump and just make sure to use your petcock to control the fuel flow. and if I'm wrong about that so called fuel pump I would like someone to explain how it pumps.
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post #4 of 4 Old 11-26-2010, 06:47 PM
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It uses the pulsing of the engine through vacuum to feed the engine with fuel, as does the fuel petcock. It uses both the pump and the petcock system to keep the fuel flowing when the engine is running and it is also a safety system so in case someone forgets to turn the petcock off after they get done riding to keep the engine from getting flooded with fuel.


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