After driving car for 7-10 minuts...

[HADI-ZR1]

thanks Pete for that info too......
as i said , my Z need his Orginal Place USA!! so ppl know how to care of it, NOT F**** cheek republic
i left my car for 6 months and the guy has Service manual and he could not find out that the coils were bad!! tell i gave it to last guy,but...

I discover the FP1 were burn. i change it and it run after 176F.
but still i feel there is no pressure as i sudden accelerate,as
engine try to stall.

* My question is, Why the Second pump shut off after 176F. ?
And for example if i switch all 16 injectors, will both pump working??
how the System works?

[A26B]

The secondary pump comes on when the secondaries are activated for full power (all 16 injectors).

No need for the secondary pump to operate during normal driving.

You need to
1. check for stored codes
2. disconnect the battery for a couple of minutes, then re-connect to clear stored codes
3. drive again to re-create problem
4. check & record stored codes
5. bring the info here for review

You probably have a secondary opening problem

[HADI-ZR1]

Update:
when i drove the car , at cold and after warm up, it seems pumps are bad,and engine stall, not good pressure, then the "service engine soon" came up, is this normal when no fuel perssure this thing "SES" lights??
i thought this thing came only for bad sensors or lossing wires!

question 2:
why both Fuel pump working when car is cold, why not just when you switch Power for 16 inj. ??
i think 1 FP is enaugh for 8 injectors mode and cold drive!
any idea?

[threestar40]

Did you pull the code yet?

[HADI-ZR1]

Originally Posted by threestar40

Did you pull the code yet?

you mean to disconnect the battery cable?

I am not sure yet what code is it.

[HADI-ZR1]

Update:
After removing pumps, i checked the Strainer were damged and clearly seen open from the ring. WHY?? look at picture!!
It has been 1 year since these orginal GM pumps installed on my Z.

the dirt and muck block out the main pump inlet port, i clean it, but the pump is already Bad...i think both of them.
So i decided to order new pumps.
I think it will be good idea to replace the Strainer frequently!
Here is some type of Strainer to buy http://store.getgmparts.com/fuel-pumps.html
WHICH TYPE IS THE BEST??

[A26B]

Looks to me like you probably need to clean out the fuel tank too.

[HADI-ZR1]

Originally Posted by A26B

Looks to me like you probably need to clean out the fuel tank too.

We Did!
Is there any better fuel Strainer than GM in market?? because both pumps Strainer been cut out!