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drcjv 07-09-2017 08:48 AM

Problem no one can figure out
 
In have a 2072 that would not run after 15 20 seconds. After talking to lots of people, dealers still can't figure it out. I have replaced the fuel pump and rebuilt carb. finally got it running yesterday but, this is the third time overnight the oil has filled up with gas. After the first two times I was told it was the fuel pump ( I changed it) after the second time I was told it was the carb (changed it) still when I went out today the oil again was full of gas. I even took the carb off another running 2072 and this still happened.

Berwil 07-09-2017 09:13 AM

Isolate the 2 components. When you park it, disconnect the pump to carb fuel line and cap it. If it doesn't fill up with gas in a couple days, bypass the pump and connect fuel line directly to the carb (with a full tank of gas). Which ever way fills up the crankcase with is your problem.

Bill

CubDieselFan 07-09-2017 09:15 AM

I would put a electric fuel pump on. I do that on all my mags.

bugeye 07-09-2017 09:34 AM

Well the gas is coming from somewhere. Could it be the fuel line is shedding particles and now has caused the carburetor float valve to stay open? Has the fuel line and fuel filter been changed?
I had a similar oil problem. I pulled the fuel tank and cleaned, then changed all the hoses and fuel filter on my 1864.

ol'George 07-09-2017 10:09 AM

Quote:

Originally Posted by bugeye (Post 426962)
Well the gas is coming from somewhere. Could it be the fuel line is shedding particles and now has caused the carburetor float valve to stay open? Has the fuel line and fuel filter been changed?
I had a similar oil problem. I pulled the fuel tank and cleaned, then changed all the hoses and fuel filter on my 1864.

And it only takes a thin hair to hold the needle off it's seat and flood into the crankcase.
you need to do some detective work:bigthink:

J-Mech 07-09-2017 10:14 AM

:popcorn::popcorn::popcorn:

flatpickerray 07-09-2017 11:08 AM

Are you sure your neighbor isn't coming over at night and pouring gas in oil fill tube?:bigthink:

Shrewcub 07-09-2017 11:14 AM

Quote:

Originally Posted by flatpickerray (Post 426992)
Are you sure your neighbor isn't coming over at night and pouring gas in oil fill tube?:bigthink:

To add insult to injury, he's probably siphoning it from the mustang.:biggrin2:

clay1811/44c 07-09-2017 11:30 AM

1 Attachment(s)
Fire hazard waiting to happen! I'll come haul it off to save your family and other toys. NO CHARGE. If not try this. I have them on all 3 of my Cub's.

drcjv 07-09-2017 12:45 PM

Quote:

Originally Posted by flatpickerray (Post 426992)
Are you sure your neighbor isn't coming over at night and pouring gas in oil fill tube?:bigthink:


Ok I'll be setting up a camera tonight to see if my 87 year old neighbor is the culprit and I'll put a locking cap on the mustangs. If it is the carb it has happened with two different carbs the same is true for the fuel pump as I changed them out twice. I will clean the tank and replace the lines and filter this week.


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