no fuel to carb on craftsman tractor

[longear]

it has a fuel pump on the front of the carb. I put new springs and diaphrams in still no fuel.

tractor runs if you dump fuel in carb.

I blew thru the line is clear

what am I missing?

Thanks in advance.

 

[scott47429]

is it a electric or vac. operated pump if its a van operated then check and see if you have vac. at the pump

 

[chance123]

Some of these fuel pumps are activated by crank case pressure. Try removing the fuel line from the carb and crank the engine over to see if any fuel is pumping out. Often times there will be air in the pump, and this type of pump will not move air, so you have to purge the air out of it, or prime it to get fuel in the inside of the pump so it will draw fuel from the fuel tank.

 

[longear]

do you mean remove the line leaving the carb?

It is a vac type pump.

 

[scott47429]

remove the line going from the pump to the carb and crank the engine see if its pumping fuel

 

[chance123]

do you mean remove the line leaving the carb?

It is a vac type pump.

No. Remove the fuel line "at" the carb. This will be the fuel line that comes "from" the fuel pump feeding the carb.

 

[longear]

sorry I meant leaving the pump.

 

[longear]

Thanks for the replies. I finally got back to it.

I removed the line from the pump--- no fuel when cranking.

Do I need to prime the pump?

How do I prime the pump?

Thanks again guys.

 

[chance123]

To prime the pump I usually remove the fuel line from the fuel tank and take a small tank from whatever is around and raise it "above" the fuel pump and crank the engine until you see the fuel pulsing at the output end of the fuel pump. By having the fuel supply "above" the fuel pump, gravity will prime it.

 

[cmj3169]

Have you tried removing the fuel shut off valve on the bottom of the carb sometimes they get stuck.Just spray a little carb cleaner and work the switch till it gets free.Has happened on a couple riders that I've worked on.Hope this helps since you have already cleaned the carb.