won't start

[nick8403]

I have a 97 Tahoe 5.7 vortec it was running fine then it just died changed fuel filter and still nothing can still hear pump and getting good pressure to lines behind the throttle body but its not getting any gas in the throttle body can dump gas down it and it runs. What am I missing any help

 

[retorq]

Exactly how are you determining that you have good pressure?

 

[Donnie Yukonie]

How is your Fuel spider?

 

[nick8403]

What is a fuel spider? And its as good now as it was before it died I'm new to dealing with throttle bodies and all the electronic stuff

 

[SunlitComet]

your fuel lines enter a body which, if old style goes into a body with injector valves in it there are output lines with a poppet valve on then end of each one that goes to to an injector runner of it own on the lower manifold. being as there are eight skinny lines stretching out is is nicknamed the fuel spider. the new design moved the injectors out of the body to enhance reliability among other things. the vortec throttle bodies move no fuel at all just air. what pressure do you get when following the tests below?

http://www.sunlitcomet.com/pdf/auto...96-chevy-tahoe-fuel-pump-pressure-testing.pdf

 

[nick8403]

I haven't messed with it today but I know I'm getting fuel to the spider but that's where it stops

 

[SunlitComet]

and you know this how? and how much are you getting?

 

[nick8403]

Well I know it cause I pulled the lines going into it and far as how much I'm assuming its enough considering my pump checked good and its building up enough preassure that when I went to remove line it shot up and hit the hood

 

[_Dylan_]

Did you check for spark? Is it throwing a code?

Is it cranking over like normal, but no start?

 

[retorq]

Well I know it cause I pulled the lines going into it and far as how much I'm assuming its enough considering my pump checked good and its building up enough preassure that when I went to remove line it shot up and hit the hood

 

[SunlitComet]

Actually verify the pressure reading. the only thing that "shot up and hit the hood" tells me is that you might have seen a woman go by but not how good she looked.

 

[nick8403]

Yes getting spark and cranking like normal will run if I spray gas or starting fluid in in it

 

[nick8403]

When I first tested it it was 53 now its only hitting 10 even when testing it at the filter

 

[SunlitComet]

uh, yeah either the pump power or ground terminal connections are breaking or if the connector is the old type that is failing, or your power supply fusing or switching is failing or your pump itself just took a dump.

 

[retorq]

It's not the pump, you have fuel spraying everywhere, remember?? Must be a blown head gasket.

 

[nick8403]

Nope not a head gasket I know that much I've fixed bunch of those and any car I've worked on or seen with one still runs with a blown head gasket but I bit the bullet and had to move it to a shop had to clear the room in the garage

 

[DTA-Tahoe]

i had the same problem ish, had the spider changed and ran like a champ!

 

[SunlitComet]

It's not the pump, you have fuel spraying everywhere, remember?? Must be a blown head gasket.

in regards to it dropping to 10 psi. or did i misread something?

 

[retorq]

in regards to it dropping to 10 psi. or did i misread something?

I'm not sure, you know me, blown head gasket is my goto diagnosis.

 

[SunlitComet]

i think you have blown your own a few to many times.