On Fri, 11 Feb 2005 20:07:29 GMT, aarcuda69062
> wrote:

>In article >,
> Lawrence Glickman > wrote:
>
>> On 11 Feb 2005 09:01:10 -0800, wrote:
>>
>> >yes it is fuel injection. i just replaced the CPI (injector/spider).
>>
>> That's probably what is called the "fuel rails" on my vehicle.
>> There is one rail for bank 1, another for bank 2, they are tied
>> together with a piece of high pressure hose.
>
>Nope, his set up is different.
>Central Port Injection (CPI)
>One centrally mounted injector (the solenoid component) with six
>plastic tubes, each one extends into an intake port, at the end
>of each tube is a spring loaded poppet valve.
>The central injector fires one time for each intake event, when
>this occurs it's the combination of fuel pressure and intake
>vacuum (pressure differential) that allows the poppet to open
>against spring pressure.
>There is also a fuel pressure regulator mounted to the side of
>the CPI, inside the manifold plenum.
>here's a picture;
>
>http://www.lindertech.com/reconinj.htm
>
>It's the fourth one down on that page.
>
>> At the end of each rail is a "test port" which is a female threaded
>> opening, presently each plugged with a Teflon-wrapped bolt. This is
>> where you can tap in with a fuel pressure gauge if so desired. Each
>> rail feeds 3 injectors. Appears to be a simple enough affair.
>
>His fuel pressure tap is at the left rear side of the intake
>plenum where the fuel lines enter the intake plenum, he has
>already mentioned testing the fuel pressure and posted the
>results.
>
>> I'm wondering if you had this problem before you replaced your
>> *injector spider* and if that is why you replaced it. OR, if this
>> problem suddenly appeared -after- the spider was replaced.
>
>IIRC, most or all of the problems were there before replacement
>of the CPI, the fuel pressure regulator was leaking, he knew this
>because he removed the manifold tuning valve which allowed a
>direct view of the fuel pressure regulator, evidence of a leak is
>apparent if one sees the normal gunk found inside the manifold
>washed clean in the vicinity of the fuel pressure regulator.
>
>> And if you didn't replace the injectors, but left the old ones on, I
>> can't help but wonder if one is sticking open on occasion, allowing
>> fuel to bleed-off into the cylinder and take down the pressure in your
>> fuel lines when the engine is off.
>>
>> Otherwise, the fuel pressure regulator is suspect, but I'm certain
>> you've already ruled that out.
>
> All of these parts are new or re-built.

So what is left over that could be causing his symptom of loss of ALL
fuel pressure on occasion?

What would you want to look at next as a probable cause of his
difficulties?

Lg