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3 carbs in a row leaking bad

#1

P

Pigletrma

My mower has a Kohler sv600 engine. IT started leaking gas out the air filter even when key is off . So I bought a cheap replacement off amazon. Same thing. So I bought a genuine Kohler (Walbro?) . Same thing! Seems to me like float is not shutting off gas - but on all three??? Any advice greatly appreciated!


#2

Scrubcadet10

Scrubcadet10

I would suspect trash in the fuel lines, flows to the carb and hangs the needle and float open. I would replace the fuel line and make sure the tank is clean.


#3

P

Pigletrma

Scrubcadet10 said:
I would suspect trash in the fuel lines, flows to the carb and hangs the needle and float open. I would replace the fuel line and make sure the tank is clean.
Click to expand...
Thank you. When will I ever learn the importance of clean fuel!!??!!


#4

StarTech

StarTech

This where I pressure test a carburetor before installation. If passes the test an problems occur I too suspect fuel line contamination. I currently working on MTD mower where it sat a few years. I would never suspected saw dust to be clogging the fuel line.

And yes old fuel lines can cause problem too as rubber flakes off and jam the needle valve open.


#5

P

Pigletrma

StarTech said:
This where I pressure test a carburetor before installation. If passes the test an problems occur I too suspect fuel line contamination. I currently working on MTD mower where it sat a few years. I would never suspected saw dust to be clogging the fuel line.

And yes old fuel lines can cause problem too as rubber flakes off and jam the needle valve open.
Click to expand...
Thank you!


#6

P

Pigletrma

OK, following advice here, I drained my tank, and got it absolutely clean. I cahnged my fuel lines and put in a new filter. Dis-assembled the carb, float and needle. blew out and got all spotlessly cleaned. put it all back together. poured in clean gas, through a filter jsut to be sure. All started leaking again instantly! Im going out of my mind!!!


#7

S

slomo






#8

P

Pigletrma

Pigletrma said:
Thank you!
Click to expand...
StarTech said:
This where I pressure test a carburetor before installation. If passes the test an problems occur I too suspect fuel line contamination. I currently working on MTD mower where it sat a few years. I would never suspected saw dust to be clogging the fuel line.

And yes old fuel lines can cause problem too as rubber flakes off and jam the needle valve open.
Click to expand...
Well, changed fuel lines, cleaned tank and carb. installed a shut uff valve and filter. hooked it up. Still leaking like crazy :(


#9

P

Pigletrma

slomo said:



Click to expand...
Thank you for the links. Off the machine, with air, they hold pressure. Back on the machine with fuel, inlet needle leaks. If I rock the machine, it will sometimes get that float moving and it will stop leaking. Same for all three carbs?!?


#10

S

slomo

Pigletrma said:
Thank you for the links. Off the machine, with air, they hold pressure. Back on the machine with fuel, inlet needle leaks. If I rock the machine, it will sometimes get that float moving and it will stop leaking. Same for all three carbs?!?
Click to expand...
Which tells you what? You have a faulty needle and seat.

Also you need to test at 7psi for around 30 minutes with the needle WET. Shoot some PB Blaster on the needle while testing.

These work just like toilets do.


#11

Scrubcadet10

Scrubcadet10

Pigletrma said:
OK, following advice here, I drained my tank, and got it absolutely clean. I cahnged my fuel lines and put in a new filter. Dis-assembled the carb, float and needle. blew out and got all spotlessly cleaned. put it all back together. poured in clean gas, through a filter jsut to be sure. All started leaking again instantly! Im going out of my mind!!!
Click to expand...
Hmmmm


#12

Scrubcadet10

Scrubcadet10

do you think you could post a video of the fuel leaking out? upload to youtube,vimeo etc and paste the link here.


#13

B

bertsmobile1

With the carb off the mower & inverted the float weight alone should stop you from blowing into the fuel inlet
Usually it will take better than 5 psi
to shift the needle

The only other thing that could be wrong is the actual hook up


#14

S

slomo

Try swapping needles around as a temporary test. This is for lawn mower engines only, not heroine.

You can use water to leak test with. Just blow is all out when you are done. Again the needle needs to be wet.


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