sugar in fuel..what r the signs ??

Sugar in the fuel tank will eventually cause the engine to stop running completely. You may or may not see evidence of the sugar if you remove and drain the fuel filter. Sugar does not dissolve in the gas so you should see something that looks a bit like sugar. If removing the fuel filter does not help you may need to remove the fuel tank and have a look inside. You may also find evidence of sugar around the fuel filler neck and gas cap.

this is a bad problem. you have a somebody that do'nt like you. you need to take engine out and have it rebuild. simple as that. suger will guck up the ejector and wear up fuil pump,jam up your cat convertor. good luck