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check fuel pump fuse and relay also the fuel injection fuse and ecu fuse, if they are ok remove the back seat and you will see a cover remove the cover and check for voltage at the pump plug and ground, you hear the pump work if not need new pump
do you mean the truck won`t start and run or do you mean it won`t turn over with the key.if it won`t turn over with the key the you may have a starter problem.if you mean won`t start then it could be the fuel pump not working.with someone cranking the motor you should hear the fuel pump running with the gas cap off and listening at the filler neck.or hear it running listening under the truck at the gas tank.if you don`t hear it then you can hit the tack sharply with your hand or a rubber hammer,it hear the pump start to run then the fuel pump needs replacing.if not check the fuses under the dash and under the hood.if they are good then it may be the pump relay in the relay box under the hood and it should be marked on the box or lid.
the relays are quite dependable now a days,check the fuse for the fuel pump in the fuse panel under the dash if the fuse is good then the relays are under the hood in a large relay box.you can interchange the relay with another relay that is the same as long as the relay is not used to run anything to allow the car to start.this will eliminate the relay.if the fuse is good you can just go from there to have someone bang on the fuel tank near were the fuel pump would be(middle of the gas tank),while someone tries to start the car,if it starts then it is the fuel pump that needs replacing and you won`t have to bother with the relay in the second step mentioned above.also the fuel filter could be plugged but you should hear the fuel pump working first.also just because you hear the fuel pump working it doesn`t mean that it is pumping at the correct fuel pressure
If it cranks strong then it's probably not the battery/alternator/starter. Check the battery terminals to make sure they're clean. Cars need 3 things to start and run: fuel, spark, and compression. If it's just cranking it might be the fuel filter and/or pump. Could also be a fuel pump or PCM fuse or relay. Check your manual to find the locations of those in your fuse panel or in the fuse box under the hood. When you turn the key to on, before trying to start it, you should be able to hear the relays clicking. If you put a finger on it you should be able to feel it click (you'll need a friend for that). You should also hear the fuel pump pressurize when you turn the key to on before starting. It sounds like a humming sound that lasts about 3 seconds. If the relays don't click, that's probably you're problem. And if they do click and you can't hear the pump, then you'll probably need to replace the fuel pump and filter. If you hear the pump pressurize then you probably have electrical or spark problem. Hope that helps!
if it starts using ether, it suggests a clogged fuel filter. You need to know what the true psi value is across the fuel rail. you can rent kit from major auto parts stores. be it remembered that many cars nowfays have 2 fuel filters- one in tank and one on frame or firewall. a quick check is back pump air through your fuel line till you hear bubbling. recheck fuel pressure and note diffetence. if it goes up you probably icked up larger debris on the screen.
Did the engine just quit going down the road? or was it parked and then would not start? Did it have fuel before you replaced the filter? Did you check all the fuses in the fuse box. I think 2 of the fuses is marked ECM, check both Fuel pump relay? swap it with another relay in the fuse box. You should hear the pump come on for 2 seconds when you turn the key on, do you? If not as you are cranking the engine have someone rap on the bottom of the fuel tank with a mallet or block of wood, or hammer and see of the pump will run. If that gets it running, the pump is bad and will need replacement.
Is your security light flashing? If your Tahoe has the factory ant-theft system, if the security light is flashing while you are cranking your anti-theft system has been activated. It is common for the Tahoes to wear out the ignition lock assembly, lock cylinder and the ignition switch(electrical) which is attached to the lock assembly. I have replaced all three parts with great success and solved the no start problem on several GM trucks.
The most common problem with these vehicles is the fuel pump. The pump should run for a few seconds when you turn the key on before you crank the engine. If you don't hear the pump run, go to the fuse/relay box under the hood. Look at the diagram on the inside of the lid and locate the fuel pump fuse and relay. Check the fuse to see if it is blown put it back if OK or replace it. Unplug the fuel pump relay and use a paper clip to jumper across terminals #30 & #87 where the relay plugs in. If the fuel pump starts running, you should be able to hear it run at the back of the vehicle, where the tank is. If you don't hear the pump running, hit the center of the tank dead-center with a rubber or wooden mallet. If the pump still doesn't run, see if you can get to the wires going to the fuel pump and wiggle them. If you hear the pump run, try starting the engine. If it starts, replace the relay, if that was the problem or the fuel pump AND relay if the fuel pump was the problem. WARNING! WHEN YOU UNPLUG THE PAPER CLIP. IT MAY BE HOT!!!
The fuel pumps AND connector are big problems with GM trucks. If you replace the fuel pump(which is located in the fuel tank), use only the factory pump which you can buy at your GM dealer or an auto parts store that sells Delco parts. If the fuel pump used the small square four-pin electrical connector, replace it with the fuel pump. The latest GM/Delco fuel pumps will come with the new plug which you MUST change over as it is now a flat four-pin connector.