no start

[Tom kite 3]

I have 520h  willnot fire off i check plugs i have spark  . plugs were a on the black side . I also put some gas in the and a little down the  Cylinder and will start. 

Any one have  Ideas what is . The only thing I didn't do a  Compression test do not have a tester . 

Edited December 16, 2020 by Tom kite
miss

[pfrederi 18,667]

not a 520 person but if it fires when you pour gas in sounds like your carb is blocked or fuel pump failure....

[oilwell1415 563]

^^^^Agreed.  But it's odd that the plugs are black if there's no fuel.

[peter lena 9,263]

those black plugs are from the last running , rich ,they will only change color or look with total heat up and proper fuel mixture, pete

[wallfish 18,087]

Maybe a little more detail on the symptoms

Is this when it sits for a while?

Has it ever started fine? Is this a recent issue or a new to you tractor?

How long since the carb was pulled off or cleaned?

Old gas? We can't get ethanol free gas at the pumps here in MA so if you want it, $$$ in the cans at the store. I've had bad gas that was bought less than 2 weeks prior.

A carb clean is probably in order and adjustment for the rich condition. Usually the dirty carb causes lean condition since it's typically restricting gas flow. Unless it's being used by adjusting the choke to keep it running smooth. That could cause the rich condition.

 

Like so many under the seat fuel tank tractors, weak check valves in the fuel pump allow the fuel to drop back down to the tank. The fuel pump can't pull fuel back up to the inlet easily and more so of a problem doing when worn and or air is present. Install a marine style primer bulb or an electric fuel pump to solve hard start after sitting long periods of time issue.

. 

[oilwell1415 563]

56 minutes ago, peter lena said:

those black plugs are from the last running , rich ,they will only change color or look with total heat up and proper fuel mixture, pete

Obviously, but the last running condition often gives a good clue for a no start.

[Tom kite 3]

57 minutes ago, wallfish said:

Maybe a little more detail on the symptoms

Is this when it sits for a while?

Has it ever started fine? Is this a recent issue or a new to you tractor?

How long since the carb was pulled off or cleaned?

Old gas? We can't get ethanol free gas at the pumps here in MA so if you want it, $$$ in the cans at the store. I've had bad gas that was bought less than 2 weeks prior.

A carb clean is probably in order and adjustment for the rich condition. Usually the dirty carb causes lean condition since it's typically restricting gas flow. Unless it's being used by adjusting the choke to keep it running smooth. That could cause the rich condition.

 

Like so many under the seat fuel tank tractors, weak check valves in the fuel pump allow the fuel to drop back down to the tank. The fuel pump can't pull fuel back up to the inlet easily and more so of a problem doing when worn and or air is present. Install a marine style primer bulb or an electric fuel pump to solve hard start after sitting long periods of time issue.

. 

I did have starter that was not working but I fix it. 3 mo. was the last it ran and store it with no gas. It has always started right up .

[Tom kite 3]

 

I did have starter that was not working but I fix it. 3 mo. was the last it ran and store it with no gas. It has always started right up

[wallfish 18,087]

Pressurize the tank if you can. That will push gas to the pump

Or Prime it a couple of times with a little fuel in the carb to see if it pulls the fuel up.

Since it runs with a prime it certainly seems a fuel delivery issue.

Water in the carb will also cause the no start but it will run with a prime of fuel

 

[Tom kite 3]

I spray carb clean in the carb and down the Cylinder and still no start . And should have fire of and did not.

[953 nut 59,928]

33 minutes ago, Tom kite said:

I spray carb clean in the carb and down the Cylinder and still no start . And should have fire of and did not.

You could be flooding the system with too much spray. From what you have told us I would suggest you remove the fuel line from the carburetor and route it to a small container. Crank the engine over for a couple of seconds and se if fuel is being delivered. If there is fuel being delivered then the carburetor should be rebuilt. If no fuel is being delivered then remove the fuel line that feeds the fuel pump and lower it into a container to prove that fuel is available to the pump. If there is fuel then the fuel pump is in need of replacement. If there is no fuel coming to the pump then the tank outlet valve could be clogged. I would suggest replacing the fuel valve and fuel line even if they are good. You can get the tank valve and seal from Lowell @wheelhorseman at Wheel Horse Parts and More, he sells lots of good stuff and is great to deal with.    

https://wheelhorsepartsandmore.com/gaskets.html#!/WHEEL-HORSE-INLINE-FUEL-SHUT-OFF-VALVE-120-253-&-1-FUEL-GROMMET-104047/p/195532368/category=23725662

[wallfish 18,087]

5 hours ago, Tom kite said:

I also put some gas in the and a little down the  Cylinder and will start

So does this mean the same thing? It will not start with fuel supplied directly into the carb or cylinder?

Or, it did before and now it won't?

[Pullstart 66,709]

I often have good luck by removing the air cleaner all together and covering the carb with my palm and cranking.  It’ll cough a minute and your hand will get wet with fuel if there is any passageway to the carb from the tank.