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1997 Chevy Blazer wont start with out help

Tiny
GEOFF137
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 134,000 MILES
My 2 door 97 chey blazer 4.3 has issues i just put in a new fuel pump after the old one went out and now it wont start unless i put either gas or ether directly in the top of the throttle body. it will stay running fine but as soon as i shut it off it wont start again its like the computer isnt telling it to send gas while starting. can anyone help


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Sunday, August 24th, 2008 AT 5:27 PM

7 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
The problem is either the fuel pump or the electrical connector to the pump or faulty fuel pump pulsator, very very common. I strongly recommend using ac delco fuel pump. The pulsator in the tank that is connected to the fuel pump has rubber o rings inside of it, did you replace that too or did you install rubber hose instead? Did the fuel pump come as a fuel pump-sender combo or was the pump seperate?
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
When you turn key to run -do you hear the fuel pump? If so check the fuel pressure/coolant temperature sensor
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
GEOFF137
  • MEMBER
  • 3 POSTS
I hear the pump fine when I turn key. The pump was a combo unit. I presure checked it and I am losing presure while starting.
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Is this a TBI or Vortec spider fuel system? With KOEO what is the fuel pressure?
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
GEOFF137
  • MEMBER
  • 3 POSTS
Its a vortec and the pressure goes up to 60 while trying to start but drops to zero right after when ive been told its suppose to maintain pressure. While runing its at about 55. Im goning to test the lines to see if im losing pressure somewhere. But what I dont understand is why it runs fine but wont start at all with out assistance. Also recently while stoping at lights it has been bogging down majorly and almost dieing and only goes 5 to 7 mph until it finally kicks in again and acts normal.
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Okay open up the upper plenum/intake and look for washed up area-pressure regulator could be leaking.

The fuel pump pressure should be 60-66psi

Check for plugged fuel filter/fuel pump strainer/restricted fuel line or disconnected dampener/pulsator.
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Friday, January 29th, 2021 AT 12:48 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
I think your going to find the problem in the tank because I have found when the regulator is leaking it floods the engine so dumping gas into it would only flood it more, like ras said check the pulse dampener in the tank, im sure thats where your going to find your problem. The orange oring inside will be torn
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Friday, January 29th, 2021 AT 12:48 PM

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