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Fuel injected gasoline engines have fuel pump in gas tank. Pump is supposed to "emulsify" (fancy word for "mix") fuel and water to help prevent a localized build up of water at bottom of tank. But ...water and gas don't mix and if you have too much water (caused from condensation ...especially in the winter ...and consistently keeping your fuel at low levels) things don't work so well. Dry Gas ...ancient stuff from carburetor days and frozen fuel lines ....get some, a couple or three bottles at least, and pour into your gas tank then fill up. Dry Gas is essentially (methyl?) alcohol that will break up the water and allow it to better mix with the gas.
will need to completely drain tank, either remove tank from car or if has an external electric fuel pump you can disconnect fuel line between pump and engine, connect 12v battery to power supply of pump and pump gas out. make sure to run line to bucket to collect gas/water mix, remember water is heavier that gas so water will be on bottom of tank and first to pump out
NEED TO ADD MORE NEW GAS POUR BOTTLES GAS TREATMENT IN FUEL TANK.IF TOO MUCH WATER IN FUEL TANK.BEST DRAIN OUT REMOVE MUCH GAS AS POSSIBLE OUT OF TANK ADD MORE NEW GAS ALSO REPLACE FUEL FILTER SEE WHAT HAPPENS.
the car won't run with water in the gasoline. water is neither compressible nor combustible. generally this comes from a tainted gas station underground tank, or a mischievous kid. you get it out by draining and flushing the gas tank and lines. if it is just a tiny amount you can get stuff at a parts store to remove moisture from your gas tank.
Try draining tank first if there is a drain plug. If no drain plug you will have to drop tank to empty it. Once tank is empty put in 2 gallons / 10 Litres of fuel and add a quart or 1 Litre of denatured alcohol or methyated spirits. The alcohol will mix with any water and consequently disperse through the fuel which will then be burnt normaly in the engine. When most of this mix is used up fill tank and add anothet pint of denatured alcohol to mix with any remaining water.
Sounds like you have bad gas. It can get strong mix of gas to give you the right idle, but when it has water mix, it will cause the car to fire like it should. This will then give you a low, rough, or just cutting off idle. Try mixing water remover in with the gas. You may have to drain the gas out or just drive it like it is until the tank is almost empty. Fill up with gas (from a different store) and you may want to change the plugs after the good gas is through the system. I'm not saying the plugs are bad, but there may be a lot of moisture beads from the water sitting causing rust.
The coolant can be found at most stores that sells automotive products. You will need a 50/50 mix of water and coolant. If you had drained you old coolant you can purchase premixed cooland were no water is added. I would purchase two gallons of cooland for you vehicle and change the thermostat as well
Sound to me like you have water in the bottom of your fuel tank. when you fill it the water is mixed with the gas until it settles. put some gas line antifreeze into the fuel tank, may take several bottles. but this should help. if not you will have to have tank taken off and drained.
Since it's not running right I'm assuming the lawn mower is a 2-stroke and the gas had pre-mix in it. It probably just got a strong mix of the pre-mix in the lines and just has to be cleared out. We run some of the old pre-mixed gas from our dirt bikes in our trucks to get rid of it. I put a gallon or so per tank refill of good gas. You may try and rev it up a bit when starting to keep it going long enough to flush it out with the new gas you put in, that or start it a few times till it's clean. An octane booster or fuel injector cleaner might help also. If the lawn mower gas wasn't pre-mix it may just be old and possibly have some water in it.