1997 jimmy. car shut off while driving. replaced fuel pump and filter. also replaced fuel pressure regulator. will start sometimes with gas poured in throttlebody and continue to run till engine gets warmed up,then it quits and will not re start. ran battery down trying to restart.
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sounds like the injectors are not getting a signal to squirt or no fuel . Have a pressure test done on the fuel manifold to check pump, pressure regulator pressure and filters.. check injector connection to ECM
check the fuel pump, it sounds like as it sits its losing pressure, when you first turn the key to the on ( not start) do you hear the fuel pump running then shut off? your fuel pump should keep pressure on the line at all times, so if you do hear the pump start it should be a very brief spurt and thats it, you can have the pressure checked at many repair shops for free or low charge,
If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.
This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.
The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.
A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.
If the car fired after pouring gas into the engine, then you should check your fuel pump, listen when you turn on the key, if you hear the fuel pump start and stop, then check your fuel pressure, all fuel injected vehicles have fuel pressure regulators, if your fuel pump isnt pushing enough pressure to the regulator the car will not start, and if it does start it wont operate properly, and may even leave you stranded.. If your fuel pressure is low, check the fuel filter, dirty filters restrict pressure, and are ALOT cheeper to replace than a fuel pump!
The first thing I would recommend is that you change your fuel filter and recheck your fuel pressure once you do that. If is persists I would check your fuel pressure regulator as well. A fuel pressure regulator for a 1997 GMC K2500 ran about $45.00 and a fuel filter runs about $7-10.00. That's a lot cheaper to go that route first than to have to spend $350.00 for a new (Lifetime Warrenty) fuel pump that comes with a new sock and sending unit.