Problems with R-19 Diesel Mod.95

Hello, sorry boys I have a problem with my R-19/RN/Diesel-Model 1995. A few days it started to go out. The theme is so starts but after 1 minute you start to strengthen and go out or go down the turns it makes rum rum rum as an old Bedford and stops, if I give the purge bomb I go crazy, I put the expert because the entrance hose was blowing to the pump and the diesel turned, now it does not do it, I also change the filter.

Most likely, you have an air intake, or you fail the valve that regulates the pressure inside the injection pump that is located at the exit of the excess of said pump, some pumps instead of valve take a calibrated step. Be lucky.

THANKS MY FRIEND!!! I thought I could check it guided by your advice but apparently I will have to go from a firefighter, thank you very much !!!