Thought I'd pass along an observation made tonight while working on the Moosestang. Current progress tonight, included installing 4 new shocks (got 2 more to go), finalizing the cooling system, and finishing the fuel system. One of the "features" of this truck, is the Argve method of fuel filter relocation. I have built a "module" that bolts to the drivers side frame rail, and includes the Holley Red fuel pump, and 6.9 filter assembly (soon to be a 7.3 fuel filter assy, with intergal heater, thanks to Towcat). In the course of installing this, I let a ton of air into my fuel injection system. To bleed it so that I could start the beast, I loosened the fuel return line fitting at the injection pump, and ran the electric fuel pump until there was just fuel with no bubbles coming out. However, I knew there would still be hills an valleys in the rubber fuel lines that would cause trapped air to remain for some time. Once the truck was running smoothly, I hot wired a single headlight (lots of electrical work to do yet. 
) and proceeded to purge the air. I have a driveway that has a steep incline, and going up the hill and back down, and then up and down over and over again, would produce repeated bouts of "diesel bronchitis". A very nasty sounding coughing fit, due to air intrusion, that could easily be mistaken as one or more injection nozzles going very bad. However, the dead giveaway that it was not an injector problem, was that due to the complete lack of an exhaust system, I could hear the air "roll" from one side of the engine to the other, as various nozzles took there turn dealing with the air problem. It took about 6 trips up and down the driveway to purge all the air out. If you had a turbo, or regular Y pipe, I don't think it would be possible to accurately diagnose this problem as air in the same fashion as I was able with no exhaust. Hence, another potential validation for mufflerless dual exhaust, as a usefull aid in troubleshooting. ;p
) and proceeded to purge the air. I have a driveway that has a steep incline, and going up the hill and back down, and then up and down over and over again, would produce repeated bouts of "diesel bronchitis". A very nasty sounding coughing fit, due to air intrusion, that could easily be mistaken as one or more injection nozzles going very bad. However, the dead giveaway that it was not an injector problem, was that due to the complete lack of an exhaust system, I could hear the air "roll" from one side of the engine to the other, as various nozzles took there turn dealing with the air problem. It took about 6 trips up and down the driveway to purge all the air out. If you had a turbo, or regular Y pipe, I don't think it would be possible to accurately diagnose this problem as air in the same fashion as I was able with no exhaust. Hence, another potential validation for mufflerless dual exhaust, as a usefull aid in troubleshooting. ;p
:Axed 
