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Junior Mint
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 Post subject: GY6 not getting fuel from Mikuni pump [SOLVED-pg.4!]
PostPosted: Sun Jul 16, 2017 11:09 am 
I have a 150cc GY6 swapped ruckus w/ mikuni vacuum pump that is not pumping. I have checked all vacuum and fuel lines for cracks, replaced a few and still nothing. I also checked gaskets on my intake manifold, everything looks good. I opened up the pump and it looks fine, no debris or clogs. I would think it wouldn't be the pump since the sending and receiving lines are clear, and it has a new vacuum hose. I could be wrong though. Pump is only a year old with MAYBE 500mi on it. I also thought it might be a clogged filter but I bypassed it and still nothing. Not sure what else to check, any help is much appreciated.

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Last edited by Rixer on Sat Jul 29, 2017 3:14 pm, edited 1 time in total.

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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:15 am 
do you have an inline check valve just after the pump?
that may be a BIG reason your not getting fuel to the pump, as fuel drains back and is not able to get all the way to the carb.....
Its an oft overlooked problem with a simple fix!


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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:19 am 
Horsy wrote:
do you have an inline check valve just after the pump?
that may be a BIG reason your not getting fuel to the pump, as fuel drains back and is not able to get all the way to the carb.....
Its an oft overlooked problem with a simple fix!


I don't, the fuel line goes straight from the pump to the carb. A few weeks ago it would get about half way up the line, but no farther, but now it's not even coming out of the pump.

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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:20 am 
yeah. horsey is right. If your don't ride it for a period of time you'll lose all the fuel and the vacuum.

Take the air filter off and hit it with some starting fluid to get get it going. It might take two or three tries.

When you do that, hold on. Hold on tight.

-=l

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Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

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Last edited by lilpinny on Sun Jul 16, 2017 11:25 am, edited 1 time in total.

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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:24 am 
lilpinny wrote:
yeah. horsey is right. If your don't ride it for a period of time you'll lose all the fuel and the vacuum.

Take the air filter off and hit it with some starting fluid to get get it going. It might take two or three tries.

-=l


I have tried that, as well as pouring a little fuel in the float to prime it. It will fire up briefly but die within 2 seconds.

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Last edited by Rixer on Sun Jul 16, 2017 11:27 am, edited 1 time in total.

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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:27 am 
then it's your jets or you have an air leak. You have an air leak.

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Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

Tanuki wrote:
I didn't say that, yet


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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:29 am 
lilpinny wrote:
then it's your jets or you have an air leak. You have an air leak.


Kinda what I figured, but what else can I check beside vacuum lines and intake gaskets & manifold? Everything looked fine when I inspected it.

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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:31 am 
its sucking too much air in. This is in our intake, and GY6's are notorious for this.

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Build thread: Backtop Thunder

Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

Tanuki wrote:
I didn't say that, yet


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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:35 am 
if you can get it to start, spray it down with some starting fluid. Don't spray in the air intake. See if it revs up.

Make sure that wheel is off the ground. it'll fire up and you don't want to deal with that.

But look at the (GY6) intake manifold, and clocking flange. Use permatex RTV ultrablack.

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Build thread: Backtop Thunder

Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

Tanuki wrote:
I didn't say that, yet


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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:40 am 
lilpinny wrote:
if you can get it to start, spray it down with some starting fluid. Don't spray in the air intake. See if it revs up.

Make sure that wheel is off the ground. it'll fire up and you don't want to deal with that.

But look at the (GY6) intake manifold, and clocking flange. Use permatex RTV ultrablack.


Can't get it to start though, except for it firing for a few seconds with starting fluid. I'll try that permatex too, not a bad thing to have sitting around the garage either. I'll probably replacing all my vacuum hoses to have my bases covered too.

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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:45 am 
yeah. you got an air leak. it's sucking i too much air. find it and you'll fix it.

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Build thread: Backtop Thunder

Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

Tanuki wrote:
I didn't say that, yet


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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:46 am 
whens the last time you thoroughly cleaned the jets?
that can be a big problem as well

https://www.youtube.com/watch?v=Q718VjhzwEI

^^^a good video on how to do that^^^


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Shot Caller
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:49 am 
Horsy wrote:
whens the last time you thoroughly cleaned the jets?
that can be a big problem as well

https://www.youtube.com/watch?v=Q718VjhzwEI

^^^a good video on that^^^


Horsy is again right. Go through that intake and carb, clean all that shit and look where the manifold/clocking flange connects. You might have to file that a bit. It's in mu build thread.

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Build thread: Backtop Thunder

Papa Smurf says it's drafty in here and those damn kids still won't get off his lawn. :smile:

Tanuki wrote:
I didn't say that, yet


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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:54 am 
lilpinny wrote:
Horsy wrote:
whens the last time you thoroughly cleaned the jets?
that can be a big problem as well

https://www.youtube.com/watch?v=Q718VjhzwEI

^^^a good video on that^^^


Horsy is again right. Go through that intake and carb, clean all that shit and look where the manifold/clocking flange connects. You might have to file that a bit. It's in mu build thread.


I made sure the carb is spotless and jets are clear just a few weeks ago. I might give my pilot another look though. I'll check that out in your thread, thanks

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Junior Mint
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 Post subject: Re: GY6 not getting fuel from Mikuni pump
PostPosted: Sun Jul 16, 2017 11:58 am 
trust me buildup and clogging doesn't take long with the gas that's sold now days especially if its been sitting un-fired for a while

shit evaporates and leaves behind its dirty/nasty residue


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