The fuel thermostat should not leak fuel if it is disconnected,but that may be why its disconnected.the little bit that it held when they bypassed it shouldnt have made much of a mess. That is right above the engine mount and fuel will deteriorate the mount if its all over the mount clean it off the best you can and check it after your next drive to be sure fuel is not leaking on it from somewhere else. Don

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Red Green "This is only temporary,Unless it works!"

97 E300D 157000 miles
87 300TD ?141k? miles