Replace a leaking grommet on the gas tank ?

fuel line is available by the foot from a mower shop
most fuel leaks involving lines and tanks can be traced to the rubber grommet at the lines to tank entry
take it to a mower shop and discuss the fix

Some fuel tanks will have a black rubber grommet that have holes for the fuel lines to go into, if your holes are in the tank itself, then no, there's no grommet. And if that's the case ,your lines are not the correct outer diameter. There are multiple sizes of fuel lines. In my shop I have multiple sizes, if you don't have that kinda stock, you're better off either ordering the ones of a parts drawing of your model or simply take your unit and old lines to the closest small engine shop and have them match em up, u actually can just bring the tank with ya.

replace the grommet fuel line

Yes you should be able to replace the rubber tank seal that the fuel line goes through. Be sure to replace the fuel line(s) when you do.

Also, make sure that the vent for the fuel tank is working. the vent is either on the fuel cap itself or thru a device commonly known as a duck bill valve, so named because of the shape of the valve. All the vent does is allow a slight amount of air to enter the tank while the trimmer is running.

The tank is under the front wheel arch. The best way is to remove wheel and splash guards and you will be able to access the tank from the engine bay and the wheel arch. Check first that the leak is not from where the pipe connects to the screen wash pump or the grommet that holds the pump in place in the tank. these would seem more likely than a split tank. The pump justs twists out of the grommet - its tight but not impossible to remove and replace if the pump has a fault on its body or pipe cionnections.
Hope this helps. good luck.

Hopefully you can tighten it up. If it is a push through set up where the valve pushes through the grommet and that is all that seals it you will have to replace the grommet with a new one. Many small engine shops will have them or you may find one at an auto parts store. You will have to take the old one out and take it with you to match it up for size.

replace grommet. you may want to replace the fuel lines to you can use echo part number # 90098. its a fuel line kit and it come with all fuel lines, grommet, fuel filter, and vent. its plug and play.

I don't think there is any way to tighten or repair leak other then by replacing grommet. sorry I'm not much help but coleman powermate is no longer in business and I have had no sucess in finding a source for parts for you.Thank you and good luck.

You probably have a defective fuel-tank selector valve. Its located on the left frame rail, halfway down. While the vehicle is running, tank"A" is pumping fuel to the engine, while tank "B" is getting the unneeded fuel that is returning from the engine. Thats why it is overflowing.