I'm new to this forum but have a 1999 773 when its cold out side it runs fine as it gets to normal running temp it will start to loose power whether under load or just sitting, I can use the primer bulb to make the RPMs come up to normal and it will run fine while doing this. So I've replaced all the fuel lines installed a new pickup pump, and tried running the machine off of a qt. bottle just in from of the primer bulb in case it had a vac. leak on the inlet side of the fuel system,I've changed the primer bulb just to be safe also. I l have also changed the fuel filter installed an inline filter along with the main fuel filter when it dies it will start back up but just has a rough idle due to lack of fuel, once the machine cools off it runs fine again until it warms up again. I'm not sure what to do now, I'm just not sure that the injector pump could go from working fine to not just by warming the engine up. Does anyone have any suggestions thanks James C