99 Taurus wont start unless primed. Fuel pump is working
I let this car sit for 2 months went to start it and it wont start. The car has the Duratech V-6 motor in it. When I spray gas directly into the intake the car will start and run as long as I keep spraying the gas directly into the intake. I hear the fuel pump run when I turn the ignition on, and the fuel rail gets plenty of gas and even seems to have enough fuel pressure, but the car will not start or run without gas being manually sprayed directly into the intake. Is the fuel pump weak? Is the fuel pressure regulator bad? The car never started totally properly. Even when it started a few months ago I had to feather the gas pedal to get it to start if the car sat for a week or more. Now it wont start at all on its own.
Check/Change Fuel Filter(s), PVC Valve & Emission Hoses
Gas that sits too long won't fire easily that's why we have to add winterize to our lawn mowers!
Try filling the tank with some high grade fuel cleaner additive. This stuff is like rocket fuel (about $10).
Also add a can of dry gas as you may have a lot of water and water vapor in your system!
Get a couple more cans of starter fluid too. (I always needed at least two to get my diesel running for summer)
Keep spraying and starting (It always took me at least a full can sometimes 2)
When it starts keep the gas pedal down and rev high for a good 5-10 minutes then see if it will idle.
If it still stumbles and falls consider adding another can of fuel system cleaner and/or dry gas.
Don't drain the tank as this usually just makes it worse by letting the bottom sludge stir up.
Never let your gas tank get too low as this will foul up your fuel system and always add fuel cleaner after every oil change (a must for fuel injection and cat. converter care)
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by primed are you supplying a fuel source if so then the car is not getting fuel to burn. this indicates your fuel pump is bad and needs replacing and change the fuel filter also. the reason the pump won`t work sitting overnight is that the pump can`t build up enough pressure possibly because the fuel pressure is not being held, but after the first start up the system can maintain enough pressure to start through out the day. you can have the fuel pressure and volume checked with a gage when the problem occours to verify.
There is a separate circuit and relay that primes the fuel system when you start the vehicle. If you sit in a silent location and turn the key to the ON position (without cranking), you should hear the fuel pump run for about 5-6 seconds. This is to bring the fuel pressure up in order to let the vehicle start. Then the normal pump circuit takes over. Sounds like your priming circuit is not working. I would try the relay first.
it doesnt hold pressure the pump primes it straight away but on teh end of the fuel rail is a vacumn operated valve that allows the build up of pressure required and if the vacumn pipe or the diaphgram is perished then thats your problem
More likely the fuel pump.........check for power to the pump on the gray wire at the fuel pump connector at the tank.(wires from the tank)You should see a prime cycle voltage as you turn the key on...if the key has been off 15 seconds. If you see a test light, light.......change the fuel pump. Tip....a lot of relays are the same in the relay center....switch the fuel pump relay for one of the (same) others to test it if needed.
Before you do this....sit in the car and turn on the key to run.....not start.......do you hear the pump do it's prime cycle? Total silence means.......in 99% of cases...a new fuel pump is needed. If you hear it.......no pump should be needed....look elsewhere first.
t's the fuel pump...unfortunately it's in the tank so you have to drop the whole tank to get to it... I don't know where you live but if it's in phoenix AZ i know of an awesome place to get parts cheap. new let me know