gas in oil.

nomar5 · 06-09-2013, 07:44 PM

I bought a 1996 Yamaha g16a gas golf cart last sept. I replace the gas filter, spark plug, changed the oil. I haven't got to use it very much at all till this weekend. Used it at the races for 2 days, noticed it was running rough. The 3rd day, when I turned the key on, it started, and tried to get it to go. It wanted to, but couldn't get it to go. I opened the seat, checked the oil. Fuel gushed out of the dipstick tube. Also when I removed the oil cap. So, I just pushed it in the trailer, looked at it today. One of the clamps on the air filter holder was off, when I removed the filter, there was fuel in the bottom of the holder. Am thinking I have a carburetor problem or a fuel pump problem. I am going to pull the drain plug for the oil first, get that changed. I am new at this, am open to any suggestions to what I should do next. Maybe rebuild the carburetor, and fuel pump..? Am glad to be aboard, from some of the post I have read, seem to be some very knowledgable people here.

1989Marathon · 06-09-2013, 07:49 PM

I think it's a good idea to look at the carb, but if that much fuel is in the motor, I would suspect a hole in the pump diaphram.

nomar5 · 06-09-2013, 08:29 PM

So, rebuild the carb is good, the diaphram is in the fuel pump, or is that an outside gasket. This my be a dumb question, where is the oil filter at..?

1989Marathon · 06-09-2013, 08:55 PM

No oil filter.
The diaphram is in the pump. An easy way to test it is to remove the pulse line that comes from the motor to the pump. Attach a longer fuel line to the pulse port on the pump. You should not be able to blow into it, or suck out of it. The diaphram only moves a little bit. If you can suck fuel out of it, the diaphram is shot.

DOOmsman · 06-10-2013, 12:59 PM

http://www.buggiesgonewild.com/gas-y...fuel-pump.html

nomar5 · 06-10-2013, 04:43 PM

I just unhooked the line that goes to the motor from the fuel pump. I was able to blow into it; Blowing into it wasn't easy, but the air seemed to be blowing in. My carb looks in pretty rough shape, the flapper where I took of the air filter case seems to be stuck open. Would I be better off just buying a new carb and a new fuel pump. Don't rebuild them..?

1989Marathon · 06-10-2013, 04:53 PM

You were blowing into the pump, correct?
When you say flapper, do you mean the choke plate? If so, pull out the choke lever and see if the flapper closes. I wouldn't buy a new carb until you know for sure you need one. I would buy a new pump. They are about $50.

nomar5 · 06-10-2013, 05:58 PM

Yes, that was the choke plate. And yes, I could blow back into the fuel pump. Am going to order a new fuel pump, see if that solves the problem. Also removed the carburetor, cleaned it up, looks much better.

1989Marathon · 06-10-2013, 06:00 PM

A new pump should take care of the issue. Good luck!

nomar5 · 06-10-2013, 06:01 PM

thx for your help.

06-09-2013, 07:44 PM	#1
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6	gas in oil. I bought a 1996 Yamaha g16a gas golf cart last sept. I replace the gas filter, spark plug, changed the oil. I haven't got to use it very much at all till this weekend. Used it at the races for 2 days, noticed it was running rough. The 3rd day, when I turned the key on, it started, and tried to get it to go. It wanted to, but couldn't get it to go. I opened the seat, checked the oil. Fuel gushed out of the dipstick tube. Also when I removed the oil cap. So, I just pushed it in the trailer, looked at it today. One of the clamps on the air filter holder was off, when I removed the filter, there was fuel in the bottom of the holder. Am thinking I have a carburetor problem or a fuel pump problem. I am going to pull the drain plug for the oil first, get that changed. I am new at this, am open to any suggestions to what I should do next. Maybe rebuild the carburetor, and fuel pump..? Am glad to be aboard, from some of the post I have read, seem to be some very knowledgable people here.
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6

06-09-2013, 07:49 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: gas in oil. I think it's a good idea to look at the carb, but if that much fuel is in the motor, I would suspect a hole in the pump diaphram.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-09-2013, 08:29 PM	#3
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6	Re: gas in oil. So, rebuild the carb is good, the diaphram is in the fuel pump, or is that an outside gasket. This my be a dumb question, where is the oil filter at..?
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6

06-09-2013, 08:55 PM	#4
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: gas in oil. No oil filter. The diaphram is in the pump. An easy way to test it is to remove the pulse line that comes from the motor to the pump. Attach a longer fuel line to the pulse port on the pump. You should not be able to blow into it, or suck out of it. The diaphram only moves a little bit. If you can suck fuel out of it, the diaphram is shot.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-10-2013, 12:59 PM	#5
DOOmsman Gone Wild Join Date: Jul 2008 Location: Reddick IL Posts: 11,220	Re: gas in oil. http://www.buggiesgonewild.com/gas-y...fuel-pump.html

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06-10-2013, 04:43 PM	#6
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6	Re: gas in oil. I just unhooked the line that goes to the motor from the fuel pump. I was able to blow into it; Blowing into it wasn't easy, but the air seemed to be blowing in. My carb looks in pretty rough shape, the flapper where I took of the air filter case seems to be stuck open. Would I be better off just buying a new carb and a new fuel pump. Don't rebuild them..?
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6

06-10-2013, 04:53 PM	#7
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: gas in oil. You were blowing into the pump, correct? When you say flapper, do you mean the choke plate? If so, pull out the choke lever and see if the flapper closes. I wouldn't buy a new carb until you know for sure you need one. I would buy a new pump. They are about $50.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-10-2013, 05:58 PM	#8
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6	Re: gas in oil. Yes, that was the choke plate. And yes, I could blow back into the fuel pump. Am going to order a new fuel pump, see if that solves the problem. Also removed the carburetor, cleaned it up, looks much better.
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6

06-10-2013, 06:00 PM	#9
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: gas in oil. A new pump should take care of the issue. Good luck!
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-10-2013, 06:01 PM	#10
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6	Re: gas in oil. thx for your help.
nomar5 Not Yet Wild Join Date: Jun 2013 Posts: 6