97 5.7 efi alpha burning head gasket

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

Thanks, does the cool fuel system have its own filter also? The only filter I was aware of was the fuel filter / water separator.

 

[Don S]

Re: 97 5.7 efi alpha burning head gasket

Have you actually checked the fuel pressure yet? Have you done any testing from the manual? Have you even looked at section 5E of the manual?
There is a filter screen just under the pressure regulator.

 

[rodbolt]

Re: 97 5.7 efi alpha burning head gasket

the high pressure pump has an inlet screen as does the lift pump. some systems also used an inline filter between the water seperator and the fuel tank.
YOU MUST test the rail pressure at the problem RPM prior to anything being replaced.
use a systematic approach and it works.

 

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

Thanks Guys!!! I will check the fuel system as you described and the manual.

 

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

Hello, another update I just tested the fuel pressure. It has 25 psi @ idle and 29 Psi @ 3500 RPM The manual calls for 30 ????

 

[dr_bowtie]

Re: 97 5.7 efi alpha burning head gasket

30psi at idle and load...?

if it is then the regulator is getting weak...you can tell the pump is fine by the rise in pressure

 

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

At idle it was 25 psi I measured 29 psi while revving it in the yard - not under load

 

[dr_bowtie]

Re: 97 5.7 efi alpha burning head gasket

no...what I meant was the book says it is suposed to be 30psi consistent?

sorry to confuse you...

I remember a post by a previous person that mentioned 28psi...?

any way I would check into the regulator if it is supposed to be 30psi at all ranges...

 

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

This has the cool fuel sytem so does it still have a regulator?

 

[dr_bowtie]

Re: 97 5.7 efi alpha burning head gasket

if it is fuel injected it has to have a regulator...

On a TBI it is in the TBI at the rear right inbetween both injectors...

 

[97searay5.7efi]

Re: 97 5.7 efi alpha burning head gasket

Im confused, in the manual it says that a cool fuel system has a fuel damper whereas the vst system has a pressure regulator between the injectors?? Does the cool fuel system have a regulator somewhere else?

 

[dr_bowtie]

Re: 97 5.7 efi alpha burning head gasket

you have a throttle body unit no...?

look at it and see if it has a regulator....

here is a link to compare what you have....

http://chevythunder.com/gm_throttle_body_injection_pg_1.htm

 

[fast50]

Re: 97 5.7 efi alpha burning head gasket

also check fuel volume many times pressure is good but no volume so load the motor and pull the trigger if it dies out look for a bad pump or clogged filter