no start, fuel pressure bleeds off
98 z28 that ran fine (sorta but it at least started) after I installed a new 6.2 LS3. After sitting in garage for 6 months, it wont start. I have a fuel gage on my fuel rail and it will get 65 lbs of pressure when I turn on the key, but the pressure bleeds off slowly. I have a new fuel pump installed when I installed new engine. Is there a pressure regulator in this system? What am I missing?
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Re: no start, fuel pressure bleeds off
Some pressure bleed down is normal. On the LS1 cars, the fuel pressure regulator is back at the tank, and bypasses fuel back to the tank to control pressure. The system is "dead-ended" with no return from the fuel rail.
Try cycling the key rapidly between "off" and "run" a few times, before turning it to "start". That will sometimes help it start quicker. But gradual loss of pressure usually does not prevent it from starting, only extends the cranking time before it starts. Is it possible your fuel is stale? |
Re: no start, fuel pressure bleeds off
Does the car start then shut down?The ethanol in the gas separates over time(just go to Jay Lenos web sight ,he has had to drop half the gas tanks on his 180 vehicles from non operation because of this.)Also condensation builds up in not a full tank of gas with no gas stabilizer .Worth checking out anyway.Hope this helps.Like Injuneer suggested,the gas has gone south maybe.My02.:)
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Re: no start, fuel pressure bleeds off
Originally Posted by Injuneer
(Post 6980820)
Some pressure bleed down is normal. On the LS1 cars, the fuel pressure regulator is back at the tank, and bypasses fuel back to the tank to control pressure. The system is "dead-ended" with no return from the fuel rail.
Try cycling the key rapidly between "off" and "run" a few times, before turning it to "start". That will sometimes help it start quicker. But gradual loss of pressure usually does not prevent it from starting, only extends the cranking time before it starts. Is it possible your fuel is stale? |
Re: no start, fuel pressure bleeds off
Originally Posted by Fatdog2
(Post 6980829)
Does the car start then shut down?The ethanol in the gas separates over time(just go to Jay Lenos web sight ,he has had to drop half the gas tanks on his 180 vehicles from non operation because of this.)Also condensation builds up in not a full tank of gas with no gas stabilizer .Worth checking out anyway.Hope this helps.Like Injuneer suggested,the gas has gone south maybe.My02.:)
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