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Also what no one is mentioning is to make sure you have oil pressure, or that the oil pressure sensor is working, alot of newer vehicles run the fuel pumps off of them oil pressure sensor so if your vehicle stops pumping oil and lubricating, it shuts the fuel pump off to protect itself from damage or further damage
sounds as if there is sticky gum in the carb that is keeping the float from seating unless it is hot enough to unstick. Take the carb bowl off and examine it for gum (real old gasoline will do that.
The fuel pump should turn on for about 3-5 seconds when you turn the ignition switch to on. If the engine starts the pump should still continue to run, if you do not start the vehicle the pump will shut off. It sounds like your fuel pump relay is stuck. Sometimes they will stick on even with the key off. The relay should be located in the relay box, under the hood on the drivers side on the inner fender well. You can try tapping on the relays with a end of a screwdriver, etc. See if that does anything for you. If that doesn;t help I will have to look up some info. Been a while since I had issues with that .
it's designed to only run until it builds a specific pressure. once the pressure is reached it turns off. if the car isn't running and you suspect the fuel pump drop the tank take the fuel pump out. use two pieces of wire and hook it straight to the battery and see if it continues to run. if it run continuously thats is not your problem as it will continue to run trying to build up pressure but it won't be able to considering it's not in an air tight system
Well, the other possible item is a load leveling pump. You need to get the car on a safe lift and explore. If the fuel pump is the source, replace it as failure will be coming soon.
When you turn the key to "ON', or "START" the fuel pump should run just enough to pressurize the system, and shut off. When engine is actually started, the pump will run continuously. Sounds like the pump relay is not getting the signal to run the pump from the key being turned to "on" or "start". Also, some vehicles can sense fuel pressure so there may be an issue with that sensor as well. In other words it thinks there is proper pressure or maybe too much pressure and wont let the pump run. I am curious to know what you find.
Sounds like a pump. You should have 43 lbs of pressure after system is primed by turning key to ON. Pump will run for 5 seconds and shut off if engine is not running. It should hold pressure for 30 minutes with just a few lbs drop. If not, it is the check valve, internal to the pump or the fuel pressure regualtor on the fuel rail. Hardly ever the latter
On some chevys the oil pressure sending unit closes the circuit to continue the fuel pump to run after start. In the event of a wreck ,the car stops running thus no oil pressure thus turns off power to the fuel pump .A safety to help prevent fires. When you first start the car, the computer turns on the fuel pump for about 20 seconds just enough time to start and allow the oil pressure sending unit to close the circuit to allow it to continue running. when the car car has NO oil pressure or the sending unit fails ,it will start then shut down..as many times as you try to start. replace the oil pressure sending unit and secure a good conection. Dan
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