Take the fuel hand primer off a John Deere 6622 combine and remove plunger?

SOURCE: gas tamk removal john deere 115

I had the same thing happen. I got the tank out, but it wasn't easy. Take out the bolts out that hold the rear end on. Take off the two springs that support the seat. Take out the battery and the battery tray. Take out the 6 bolts that hold the black cowling and the front of the green platform to the frame. This will allow you to lift the seat platform far enough off the rear end to allow the tank to be pulled out through the side. You also have to remove the metal bracket which holds the front of the tank and has caused the tank to leak in the first place. New tank is $56.00 not installed. I used a soldering gun and melted the plastic back together. I think it will hold quit a while. I know this is a little sketchy, but It worked for me.

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If you will look at the carburetor very close you should be able to find a brand name such as walbro or zama. most all weedeaters will have one of these two on it. find name of it out and take your bulb to a local small engine shop and they should have one in stock.this should not cost more than 2-3 dollars .

SOURCE: I have a John Deere hand held blower. I can't get

Your adjustments to the carburetor may make it worse.
Plus if the fuel mixture is over 30 old, I would replace it.
Manufacturers have told us this year any gas over 30 days old is considered bad gas and needs to be replaced. I would try some fresh gas(from the station) and some new 2 cycle oil at 40:1 Ratio(3.2 ozs 2 cycle oil to 1 gal of gas).
Good day.

SOURCE: John Deere 5420N. Fuel leaks out of top of fuel

You need to get a new primer pump and they can be replace with no tools,just unscrew the top off the pump by hand and replace it.

SOURCE: Trimmer won't start

The fuel line may not have a good seal to the fuel tank.