My 300 SD took 30 or so revolutions to get fuel to leak from cracked nuts in the IP tubes to the nozzles. The OEM primer pump failed and I believe allowed air into the system as the engine died. I loosened the nuts roughly 1/3rd turn. Now I have a 'modern' prime pump ($16.00 & a 5 minute fix). So charge the battery, loosed the nuts and crank till you make a mess.