help troubleshooting carbed 2008 IQ

[knee deep in it]

I just installed a Union Bay 727 into my 2008 RMK. If I put a cap full of gas down the spark plug hole, it will run for 3-4 seconds and then die. Spark and compression are good so it must be fuel.

Is there a troubleshooting order? Visible inspection is good. It has some gas in tank. Plugs are wet after I pull 20 times.

How do I check fuel pump operation?

Before I get too involved,I sure would appreciate some help.

 

[BB454]

727

I would clean the carbs. Odds are the idle jets are plugged. If it fired then you have spark and it the plugs were wet then the pump is working.

 

[knee deep in it]

well, it gets more interesting. I pull the rope a few times and raw gas comes flowing out between the y pipe and the pipe. About a cup. Whole house stinks. I tried it again tonight and same thing.

 

[Mentzel]

Make sure to ventilate your house man, safety first! I've caught my garage on fire before and it was very scary!

Why so much fuel?

 

[sled_guy]

Sounds like needle/seats are not shutting fuel flow off... could be adjusted wrong, bad floats, or bad needle/seat. When you put the 727 in you didn't have to change carb angles at all did you?

I'm assuming its carbed and not injected... maybe bad assumption.

sled_guy

 

[knee deep in it]

I have a theory - I think the gas is actually coming from the pipe. I may have filled the pipe with gas when I was first trying to start it. When it runs, there is some banging that sounds like fuel igniting in the pipe.

I am going to drain the pipe and then try again with a cap full of gas in each cylinder. I pulled the sled out to the back yard last night but it was too dark to do anything. Hopefully it works out tonight.

 

[knee deep in it]

so i get home early to look at it in daylight. 2 pulls on the rope and gas comes pouring out between the y pipe and the pipe. About 1/8 cup in only 2 pulls.

I put a cap of gas in each cylinder and it runs for a minute. Go to start it again and the frickin pull cord snaps in my hands.


AAAAAAAAAAAAAARRRRRRRRRRRRRRRGGGGGGGGGGGGGGHHHHHHHHHHH

 

[knee deep in it]

well, sleds never cease to surprise me. The issue was the fuel pump. I had the impulse line and the fuel out line reversed. I have no idea how it could run on one cylinder but it did.