Troy Bilt Pressure Washer Model 01902 Leaking Gas from Air Filter

Bad pump

There is no need to prime. But you do need to use the black spray nozzle to get soap to siphon out.
if that doesn't solve the problem let me know

the pump possibly, a blocked intaked is more likely

Could also be crack/leak in HP pump. If it were left in cold weather without antifreeze, I'd check there first. Part + labor might warrant new washer if more than a couple years old.
Sorry.

Your washer was sitting for a while I suspect. Check the carb and make sure it is tight to the engine. If it is then you will need to take the carb off, careful not to tear any gaskets. Then remove the fuel bowl and clean out all ports. Make sure to clean out the jet as well as I suspect the fuel is clogged in the carb and overfilling. Your needle valve is stuck open and then flooding your carb and spilling out the side of your engine. Make sure your needle valve and float can move freely before reassembling. Good luck

I have found t vinegar has many uses. Mix the water with vinegar

Call us when you can be at the washer so we can trouble shoot it with you over the phone.
http://www.ppe-pressure-washer-parts.com/troy-bilt-020416-1-pressure-washer-parts

I'm not sure what you are expressing. Give us a call when you can be at the washer so we can diagnose it over the phone.
http://www.ppe-pressure-washer-parts.com/troy-bilt-020416-1-pressure-washer-parts

I need a gas tank for a 020245 Troy- bilt pressure washer 2200.

usually you can get a seal kit for your pump. I would need the model number to direct you to the parts you need.