If it is a proper Ford (up to 1991) and has the Dover engine, try running it with the rocker cover off and check the fuel injector leak off pipes. These run between the injectors. The pipe cold be cracked or broken. Sometimes the union that screws into the cylinder head can crack if it is over tightened. The leak will be worse if the fuel is returned to the fuel filter and not to the fuel tank. I hope this is of some help!
Will Southgate, July 2015
