fuel pressure ?

[stlunatics2oo3]

okay I have 3.4 automatic and i checked the fuel pressure with engine off pump on and its 41-43 psi and after the pump primes it immediatly drops pressure to zero. But with the vehicle started and idling its at like 37psi.


my question is what does the pressure dropping so rapidly mean? If i remember right it means a leaking injector right or bad fuel pressure regulator.


and if its a fuel pressure regulator I have seen some i can buy but i am not sure how hard it is to change


thanks for your input guys

Jeremy

ps. my car runs decent but i get ****ty gas mileage and the motor only has 10k on it so i believe the injectors or fuel pressure regulator would cause this

[stlunatics2oo3]

Re: fuel pressure ?

come on guys help me out. I took the vac line off the fuel pressure regulator and put my finger over it to plug it and it still dropped rapidly

i am thinkin i have a injector problem

[BobbyZ72]

Re: fuel pressure ?

LOL, you have have to allow more then 2 hours. And it sound like you already know whats wrong with it, and now you just have to start changing parts. It all should be pretty easy, just take time cause every thing is so tight. My guess would be the regulator, becuase if the injector was leaking that fast your car would be harder to start.

[stlunatics2oo3]

Re: fuel pressure ?

well has anyone changed the regulator, I figure i am going to change both injectors and regulator

[BobbyZ72]

Re: fuel pressure ?

The injectors are abour 100 dollars each around here at local auto parts, i have seen them for much cheaper online. What im trying to say is it would be expensive just to change them out. I guess you could pull the fuel rail out with the injectors still on it, and turn the car on. This way you could see if any of them are leaking.

[stlunatics2oo3]

Re: fuel pressure ?

i am getting accel injectors for 230 shipped next day air all 6. I am just hopin it fixes the problem if not its the fpr and a stock oem one is 47 bucks

[slow6]

Re: fuel pressure ?

I guess you could pull the fuel rail out with the injectors still on it, and turn the car on. This way you could see if any of them are leaking.

WHAT!?

[stlunatics2oo3]

Re: fuel pressure ?

yes slow6 i did read that it would of been a big mess

[BobbyZ72]

Re: fuel pressure ?

how would it be a big mess? the engine not running so they wont be spraying. they will just be pressurized. if one is spraying or dripping, you would know thats the bad one.

[stlunatics2oo3]

Re: fuel pressure ?

i am sure one of them is leaking but i do understand what you are talking about

[slow6]

Re: fuel pressure ?

should you disconnect the starter or something? It sounded like you were literally supposed to turn it on. Is this bad? I'll have to try it sometime..