I just purchased a 1970's vintage MF275 with a Perkins diesel. I had to replace the gasket on the top portion of the injector pump and on the side port. Now when I start the engine it runs for about 1 minute and shuts off. I found that if I open the top bleed screw the engine will continue to run as fuel escapes from the bleed screw. I close the top bleed screw and the engine shuts off. Any Ideas?