460 gasser, need help

[csangster]

I brought my grandfathers 460 back from being yard art

Joe at Redrunrite has been helping me a lot.

Engine is tired but running.

Replaced the following:
Plugs
Points
Condenser
Sediment bowl

I cleaned and sealed the gas tank to the best of my ability, but there is still fine sediment in the bowl.

I rebuilt the carburetoe

Fuel seems to flow slowly out of the bowl, but I’m not sure what it’s supposed to look like

I fire it up and it runs great for 30-60 seconds then dies. Then I can fire it back up.

I am beyond perplexed.

Chris

 

[used red MN]

Hello Chris welcome to YT! What are you calling “the bowl” that the fuel is seemingly running slow out of? Best place to test is out of the carb bowl drain plug. Pull the plug and count to 5 before you start catching the fuel in a pint container. Timing that 2 minutes you should fill that pint. If the flow goes down to drips then of course that is your problem. Are you aware that the fitting that screws into the carb that the fuel line attaches to has a fine strainer screen that can plug? First thing to check out if your flow is slow. When you have the line off open the valve to verify good flow there from the sediment bowl under the tank. If not your sediment bowl under the tank may be plugged or the outlet in the tank in top of the sediment bowl may be plugging with crud that is in the tank.

 

[csangster]

Hello Chris welcome to YT! What are you calling “the bowl” that the fuel is seemingly running slow out of? Best place to test is out of the carb bowl drain plug. Pull the plug and count to 5 before you start catching the fuel in a pint container. Timing that 2 minutes you should fill that pint. If the flow goes down to drips then of course that is your problem. Are you aware that the fitting that screws into the carb that the fuel line attaches to has a fine strainer screen that can plug? First thing to check out if your flow is slow. When you have the line off open the valve to verify good flow there from the sediment bowl under the tank. If not your sediment bowl under the tank may be plugged or the outlet in the tank in top of the sediment bowl may be plugging with crud that is in the tank.

I forgot about the screen in the carb, I’ll check that next. Thank you!

 

[caterpillar guy]

It should flow a full line from the tank . If not then the sediment bowl and shut off valve are plugging. You say you still have fine sediment on the bowl so you are probably still getting rust from the tank in the fuel. You will need to clean the tank again several options are to fill with nuts and tie to another tractor wheel and drive around awhile do an acid bath then flush out well, Washout with gas or other solvent or even coat the inside of the tank and those require a clean tank to work well. Then once the tank is clean and sediment bowl and shut off are clean try again for a full flow at the line infront of the carb if good then check at carb drain.

 

[csangster]

It should flow a full line from the tank . If not then the sediment bowl and shut off valve are plugging. You say you still have fine sediment on the bowl so you are probably still getting rust from the tank in the fuel. You will need to clean the tank again several options are to fill with nuts and tie to another tractor wheel and drive around awhile do an acid bath then flush out well, Washout with gas or other solvent or even coat the inside of the tank and those require a clean tank to work well. Then once the tank is clean and sediment bowl and shut off are clean try again for a full flow at the line infront of the carb if good then check at carb drain.

I cleaned and sealed the tank, using a chain on the inside and rattling it around.

I like your idea of filling with nuts however I only have one tractor

What do you mean “it should flow a full line from the tank”?

Thank you
Chris

 

[wwoodrow]

I cleaned and sealed the tank, using a chain on the inside and rattling it around.

I like your idea of filling with nuts however I only have one tractor

What do you mean “it should flow a full line from the tank”?

Thank you
Chris

I have filled with nuts and such and white vinegar then shaken by hand or whatever method you can improvise. Works extremely well but must wash the vinegar out well afterward as it is corrosive .

 

[used red MN]

I cleaned and sealed the tank, using a chain on the inside and rattling it around.

I like your idea of filling with nuts however I only have one tractor

What do you mean “it should flow a full line from the tank”?

Thank you
Chris

By “full line” he means it should flow out essentially the diameter of the inside of the tube. The lines screw into the carbs horizontal on those, so if you have the gas valve wide open with the line off it should shoot straight out for a bit then start to drop. It should not just drop down right away like water falling off a rock ledge.

 

[csangster]

Update,

I realized that even after cleaning the heck out of the tank that scale and rust was still clogging the sediment bowl.

I decided to press a ‘stand pipe’ into the top of the sediment bowl housing. I took a piece of fuel line (~2” long) drilled out the top of the sediment bowl housing and pressed it in. She will always have 2” of gasoline in the bottom of the tank but now she runs like a champ without clogging the sediment bowl.

Chris

 

[used red MN]

You could lower it down to a 1/2” above top of the sediment bowl and it would still run fine.