Question about 1997 Ford Taurus

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Replaced pump won't run unless you prime throttle

I replaced fuel pump and fuel filter also pressure regulator but won't run you prime throttle could injectors be stopped up or is there something else that could be wrong

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I assume that you mean that that you have to keep your foot on the gas pedal to keep it running if this is the case I would replace the idle air control solenoid or IAC as it mostly called it is a ez fix it is located on top of the engine in plain site with two 8mm bolts it will take about 10 minutes start to finish, again I am saying this with the above guess if this is not true I will need more info.
Jim

Posted on Oct 04, 2008

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I have a 1992 camaro RS 305 with 5 speed. It will turn over but won't start, if you pour gas in throttle body it will fire right up and run like it should. I put in new fuel pump, new ECU, new TPS, still...


If you turn the key to the on position and you hear the fuel pump run, does it run for longer then 5 seconds? If so then you are going to need to look at your fuel filter, if it stays running then you are going to need to look at your fuel regulator. You can also go to Auto Zone and buy a fuel pressure test kit or rent one, and check your fuel pressure on the fuel rails. Check for spark also, if you are low on spark then you are not going to fire, unless you dump more fuel then you need to into the throttle body.

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Sounds like the fuel pressure regulator is allowing the fuel pressure to bleed down. While sitting (key off) it should hold about 30 psi of fuel pressure to keep the system primed. When it bleeds down it causes an extended start, you sometimes have to cycle the key a couple of time before it will start. If this is the case then replace fuel pressure regulator. FYI pumping the accelerator on a fuel injected vehicle does not prime the system.

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There is a check valve in the fuel pump that sounds like it may have gone bad. Check the fuel pressure at the shredder valve, there should be 60 to 65psi during the prime and will drop 5 psi when the engine is running. Once the fuel line is primed, check to see how fast you lose your prime. Since you replaced your injection system, we can eliminate the fuel pressure regulator leaking which was common on the injection system your truck run's on. If the fuel pressure drops fast then it's going to be a bad check valve at the fuel pump and it may be time to replace the fuel pump it self. Good luck and hope this helps. Note: do not try to start the engine with putting gas through the throttle body, it's been know for small fires to start and burn the spider injectors. 

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Have you Replaced the Fuel Filter Yet???? How long does it run when Primed? Does it just Burn what is in the Bowl and Die?

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