[grumpyjenkins]

I have a TBI related question. My truck now will not start on its own, if you pour a little fuel down the throat it fires right up like it's not getting the initial prime shot. At first I figured fuel filter, or pump. changed the filter and had no change. the fuel pressure is 12lbs running and does not drop even when the vehicle starves of fuel then stalls. If you open the TPS up when it starts to stall, you see the injectors pattern get larger and the vehicle doen't stall right away,but you must keep increasing the amount the TPS is open and it wont stall untill the tps is eventually bottomed out (wot position) and the fuel just dribbles out. This led me to believe that it is a volume issue, but yet the pressure did not drop with the snap on tester inline. the box is currently off, and the fuel pump is easy to get to, so I changed it as well, with no change. all this led me to believe that there was an obstruction of some sort in the tbi unit, so I disassembled the tbi unit removed injectors and what not and there is no visible obstructions and all orifices were blown out with compressed air including feed line from tank. Both injectors seem to work fine, you increase the pulse rate and they open right up, but then the pressure drops at the injector nozzle and it just runs out of fuel at the injector, the line still has full pressure! I could see no wrong inside the tbi assembly but for some reason fuel is not keeping volume between the inlet fitting of the tbi and the injector. when I break the feed line loose after it runs the tbi out of fuel, it still has line pressure in it but yet fuel ran out at the injector. I am lost, it doesnt make any sense. please help as this was not a gradual thing, one day it ran, next day it didn't