LEYLAND 270 INJECTION PUMP PROBLEM. Just replaced main clutch release bearing & ready to start up when i saw diesel dripping from bottom of injection pump. It's a plunger on the bottom of pump.When I try to start it squirts fuel out. When I tighten the nut which has a plunger coming out of it it leaks more. When I loosen it it slows or stops. Can't find info on how to put pump back in .Any information would be appreciated .Tks Jon