Question about 2000 Ford Mustang

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Installed a new fuel pump on the car. turned the key on and the pump ran for about a half a second and shuts off. does not have any fuel pressure.

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Check pump fuse and relay
then check for power at pump

Posted on Apr 01, 2011

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Modern fuel injected vehicles will only run the pump for a couple of seconds to pressurize the fuel system at stat-up. The pump won't run after that until the engine is running or you are actively engaging the starter. The fuel pump and relay are doing exactly what they are supposed to do. Now, that doesn't mean the pump is building pressure like it should but the pump running for a second then shutting off after you first turn on the key is normal operation. You may have entered it, but I can see no information about what vehicle you are working on other than it is a truck. More information about the vehicle would help. In the mean time, I feel a compression check is an order and you should take a look at the oil to make sure there isn't any water mixed in. Some history would help as well, like if you have done any type of service in the last month, when the basic maintainence was done, how many miles are on it, etc.

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Replace the fuel filter first. When you turn the key on, the fuel pump should run for a few moments, then turn off. If it keeps running, then replace the pump as well. Suggest having the fuel system pressure checked at the engine itself. Hope this helps!

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My 2005 Trailblazer ran out of gas, now it won't start. It cranks and catches, but shuts right back off. Is there a fuel shut off valve? If so, where?


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I have a 95 Maxima I changed the fuel injectors and now the car wont start.  so i put the old injectors back and it still wont turn over,  It stay on for about 2 sec can anyone help me


I assume you bled off fuel pressure before you installed the injectors. Try this to pressurize the fuel system. Turn the key to "on" position and wait 5 seconds. AT same time, listen carefully for a buzz sound that means the fuel pump is running to pressurize the system. It will shut off after 5 seconds. Then, turn off the key and wait 30 seconds for the computer power relay to shut off. Then, turn the key to "on" again. Thsi will run the fuel pump for another 5 seconds. Repeat 5 times. Fuel system should be pressurized now.
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