start issue cold

My 2000 Dakota just started having this problem last week. When it sits for 6-8 hours it won't start. Turns over great spits a few times but won't fire
up. I remove the air cover and put some gas in the throttle body butterfly and it starts right up and runs great, you then can drive it shut it off and it starts right backup until it sits for 6-8 hours. I thought for sure it was the fuel pump and filter so I changed the unit and it started right up sat all day and the next day I got the same thing. I show no check engine light. Any help would be great. Thanks Greg
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I'd check fuel filter or fuel reglator.. It is acting like my old carb truck.. (yes your's is FI) it would leak all the fuel back and do the same.. I suggest you turn your key forward in the morning til you hear the pump stop, then turn the key off and wait 1 min then do it again and try starting.. If it starts it is a fuel issue.. If it does the same, try pumping the gas epedal once while it is turning over.. May be TPS sensor.. I have seen em fail and not throw a code. Please don't bash me.. just simple things I try before calling the garage..

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It sounds like you might have a problem with the injectors. Your symptoms sound fuel related and after replacing the pump, the injectors are the really the only thing left. If it were the cam or crank position sensor, then you would have no spark either so pouring fuel into the throttle body would have no effect. It sounds lile the injectors are sticking when they get cold and not delivering fuel to the engine. It could be that the fast pulses to the injectors when the engine is running on the fuel that you dumped into the throttle body frees them up and gets them working again while the slow pulses to the injectors during cranking just can't do it. When you changed the fuel pump, did you get rid of the old fuel? If not, you probably should have. If you did I would put a good fuel injector cleaner in your tank, fill it to the recomended amount and run it through to see if it helps.
--
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On Tue, 22 Jan 2008 16:55:59 -0500, Greg and Candy wrote:

I would start by putting a fuel pressure gauge on it, see what pressure it builds when you just turn the key to the "run" position, see what pressure does when cranking, then once its running what fuel pressure/ volume is like. after all that shut it off and watch what the pressure does over the next 6 to 8 hours of sitting. you may have a fuel leak somewhere allowing the fuel to bleed out of the lines. Most common place for this is the fuel pump housing. its possible the check valve on your new pump Assembly is faulty, its also possible that your injectors or something else is leaking fuel, and its also possible that it's something else entirely.
But this is where I would start.
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Chris

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wrote:

============= =============
If you're trying to figure it out yourself.........then...........
I agree with.........
Chevy...............you should try the key on..key off..key on thing to see if the fuel pressure builds up and starts the truck running first.
T-Bone.........you should focus on the injectors on the pres. regulator at this point. Both of which could be hidden, or overcome, by the simple proceedure Chevy gave you. (not gauranteed)
Chris..........it could be possibly........anything! (srry......cuddn't help meself)
:)
anywhoooooo........
what Chevy and T-Bone said, ditto.
~:~ MarshMonster ~takes a toke.....advises you he's NOT a drivability tech~ ~:~
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On Fri, 25 Jan 2008 07:57:43 -0800, Marsh Monster wrote:

LOL
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Chris

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