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Have you checked for power to the pump from the fuel pump relay.After the key has been off for 10 seconds,turn it on and there should be a short 2 or 3 second pulse of power from the relay and you should also hear a click there.If there is no power pulse,is there power to the relay?Remember the relay only primes the fuel system and the oil pressure switch keeps power to the pump when it sees oil pressure.Is there power at all times to the oil pressure switch?On these vans the wire from front to the pump can go bad,quite a few have had a new wire run for the pump over the years.A great van.
Your post is lacking any detail. However, if you are stating that the engine starts after being cranked but dies out (wont stay running) there are 2 ways the fuel pump is activated. When the key is first turned on, there is a 5 second fuel pump run (the ECM energizes the fuel pump relay). After the engine starts, the fuel pump relay will only stay energized when the oil pressure switch closes keeping the fuel pump relay on (oil pressure is above 5-7 psi). If the oil pressure switch is faulty or there is no oil pressure, the engine will stall just after starting.
You should never try a pump without it being in fuel. It uses fuel for lubrication when it is running. If the vehicle doesn't start at all when you first crank it over it is not the oil pressure sender. If you just put the pump in you might want to turn the key off and on several times to cycle the pump then try to start it. If it doesn't start then check fuel filter or check fuel pressure at fuel rail in engine compartment. Is fuel pump cycling at all when the key is turned on? There is a problem with ignition switches on some of these blazers.
did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.
You'll have to take the oil pan off. First drain the oil though. Once the pan is off the oil pump and screen wlill be attatch with a couple of bolts. The the new pump wont come with a new pick up screen. Twist the shaft with your hand to get get it apart. Install it on the the new screen on the pump in the same direction as it come off or it wont set down into the pan. make sure you use a new gasket. Three hours and your done.
Test all the cables, never dismiss the fact that a new part could be faulty.
Make sure you put the HT leads back in the right order...
Make sure the oil pump is primed, some engines refuse to start if there is no oil pressure... find a way to fill the oil pump manually otherwise it may take ages to get oil pressure.
the oil pump is not electronic it is gear drivin . either the gear is bad or the installation was done incorrect. my advice is to start over and sure the rod is seated correctly . you should be able to put the rod in and not be able to spin it. if it spins that means either the gear is completely bad or the rod needs replacing or both. in order to replace the gear you have to remove the timing chain. in your vehicle if you have a distributor and not coil packs you have to remove the distributor and look at the bott of the shaft to see if it is worn out. hope this helps........please rate this.