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runs for 10 seconds and dies

#1

R

rob50

Mower would not start. Ethenol gas destroyed the carb. I've tried 2 new carbs and it runs for 10 seconds and dies. I have no idea why.

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#2

I

ILENGINE

Need to check fuel flow into the carb. Remove the fuel line from the carb and observe the flow of fuel coming out of the fuel line. If not a full stream then there is an obstruction preventing fuel flow. and could cause the issue that you have because it is burning fuel faster than it can refill the carb.

also keep in mind that MTD likes to hide a screen in the inlet fuel pipe that cannot be directly accessed and depending on material lodged in the screen cannot be blown out with compressed are. So may need to look hard down into the fuel inlet with a magnefying glass and check for debris, and may need both compressed air and carb cleaner to get the stuff out of the screen. That screen plugging will also cause your issues.


#3

R

rob50

I have large supply of gas coming out of hose to tank


#4

S

slomo

rob50 said:
I have large supply of gas coming out of hose to tank
Click to expand...
AT the carb right?


#5

S

slomo

You need 4 things for that little guy to run. Air, fuel, spark at the correct time and compression. See which you are lacking.


#6

R

rob50

slomo said:
AT the carb right?
Click to expand...
yes


#7

R

rob50

slomo said:
You need 4 things for that little guy to run. Air, fuel, spark at the correct time and compression. See which you are lacking.
Click to expand...
all are there.


#8

S

slomo

What have you done to fix it exactly?

Fill the tank completely. Drain into a glass jar. See if the tank empties fully with a purpose.

How did you check spark?

rob50 said:
I've tried 2 new carbs and it runs for 10 seconds and dies. I have no idea why.
Click to expand...
So it runs for 10 seconds and dies. You have the proper recipe for THAT 10 seconds. After that you are missing something. What do you think it might be?


#9

R

rob50

slomo said:
AT the carb right?
Click to expand...
yes


#10

R

rob50

slomo said:
What have you done to fix it exactly?

Fill the tank completely. Drain into a glass jar. See if the tank empties fully with a purpose.

How did you check spark?


So it runs for 10 seconds and dies. You have the proper recipe for THAT 10 seconds. After that you are missing something. What do you think it might be?
Click to expand...
I am at a loss as to what to do. If it was timing, it wouldn't run as it runs smooth for 10 sec. Plenty of gas flow and good spark


#11

S

slomo

rob50 said:
I am at a loss as to what to do. If it was timing, it wouldn't run as it runs smooth for 10 sec. Plenty of gas flow and good spark
Click to expand...
You can't have plenty of gas and spark and it not run proper. Unless you have low compression or no air. Pull the air filter for testing only and see how she runs.


#12

B

bertsmobile1

As you have several carbs , if they all came with solenoids , snip one off and see if that makes a difference .
IF yes then sip a volt meter on the plug and see if it supplies battery voltage after 10 seconds
Als check the ground connection for a good ground while the engine is running .


#13

R

rob50

slomo said:
You can't have plenty of gas and spark and it not run proper. Unless you have low compression or no air. Pull the air filter for testing only and see how she runs.
Click to expand...
I haven't been using the air filter whiie working on it


#14

R

rob50

bertsmobile1 said:
As you have several carbs , if they all came with solenoids , snip one off and see if that makes a difference .
IF yes then sip a volt meter on the plug and see if it supplies battery voltage after 10 seconds
Als check the ground connection for a good ground while the engine is running .
Click to expand...
There are no solenoids on this engine


#15

StarTech

StarTech

Note: This mower has the 2P70M0C engine.

If running 10 secs it does sounds like an issue with fuel delivery. Have you checked the fuel tank filter and sure the fuel line is good as if the liner is collapsing as it flow good until the tank develops a slight vacuum?


#16

H

Honest Abe

ILENGINE said:
Need to check fuel flow into the carb. Remove the fuel line from the carb and observe the flow of fuel coming out of the fuel line. If not a full stream then there is an obstruction preventing fuel flow. and could cause the issue that you have because it is burning fuel faster than it can refill the carb.

also keep in mind that MTD likes to hide a screen in the inlet fuel pipe that cannot be directly accessed and depending on material lodged in the screen cannot be blown out with compressed are. So may need to look hard down into the fuel inlet with a magnefying glass and check for debris, and may need both compressed air and carb cleaner to get the stuff out of the screen. That screen plugging will also cause your issues.
Click to expand...
have you pull the fuel tank cap off and cleaned any dirt/debris that may be restricting air/fuel flow


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