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Re: air in fuel
A GEO PRIZM FIAT, is this an engine swap question?
or is it pure FIAT> if yes, its best to post to FIAT section for faster answers.
i promise !!!
to fix diesels, its best to have the FSM, it covers your system.
many (most) diesels have there own unique injection system.
and built in diagnostics. the FSM covers this Uniqueness and what to do. get one. and save a fortune now and later. in fact buy it with the car. id never own any car with no FSM.
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You don't. You just crank the engine until it starts. Modern vehicles work on a pressurised system with a return back to the tank. The fuel is pumped from the tank to the injectors and excess fuel is returned to the tank.
I don't know a lot about these trucks but I can tell you that somewhere between the spin-on fuel filter and the I.P. (injection pump) is a 1.5" dia X 4" long steel primer. Just under the top of it is a spring. You will need to loosen or open the "Fuel supply line", at the I.P. (going from the filter, to the pump) and manually pump the fuel primer. Continue pumping the fuel primer until diesel flow from the opening. Quickly close off the drain-port or fuel-line, pump the primer a few more times (to increase line pressure and try to start your vehicle. After it starts, check for leaks. Let me know if I can help anymore. Good luck.
First I would check to make sure you have the proper fuel pressure at the pump - you should have 2 pumps - one that delivers from the tank, and a high pressure pump for the injectors. Make sure that both are delivering properly - you may need to prime the pumps for quite some time if air got into the lines. Also make sure the cam / crank sensors wiring has no corrosion and is making proper contact. Between 0 to 300/400rpm the signal can be slightly erratic until the engine is started so I would not worry too much about that.
a diesel engine can only cutout when overheating, loss of diesel fuel and air leak in the fuel system. if you know how to bleed or ask somebody to bleed right after it stall, then start the car, if it starts immediately then it is sucking air.
Well, one problem is, if its an 8.1, its not a diesel. The 8.1, or Vortec 8100, is a gas engine. The DuraMax is a 6.6 engine. There is usually not a priming system on a gas engine, because the fuel pumps will usually get it through the smaller filters used quick enough you dont need them. However, if it is a DuraMax engine, then right on top of the fitting where you mount your diesel filter, there is a primer pump and an air bleed valve. What you do is, open up that air bleed valve ( its a little black plastic octagon shaped thing on the top of the filter mount) then you pump the primer (the silver button looking thing) until you get diesel squiting out the air vent without too many air bubbles or gurgles.