Have to prime truck before starting, help...

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  #1  
Old 02-12-07, 10:29 AM
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Have to prime truck before starting, help...

I have a 87 Chevy 4X4 305ci full size blazer. About 4 months ago the only way I could get my blazer started was to prime the carb. I was told to put a new fuel regulator on the carb, did that, and the blazer started up everytime. Now 4 moths later I'm having the same problem, if I prime the motor by pouring gas in the carb, it'll start. Once I shut it off, I have to prime it again. Any ideas what it could be this time?
 
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  #2  
Old 02-12-07, 03:19 PM
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questions?

fuel pump electric or manual? carb or fuel injection? if a carb truck with manual fuel pump accelerator pump in carb would be a suspect
 
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Old 02-12-07, 03:27 PM
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Time to rebuild/clean the carb.
 
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Old 02-13-07, 05:26 AM
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I have a brand new electric fuel pump, just put it in, I can hear it running when I turn on the key. The truck has fuel injection, just put a new fuel regulator in the fuel injection carb. It doesn't have a carb, I can't remember what they call it.
 
  #5  
Old 02-13-07, 06:17 AM
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would check codes in the computer, and check for injector pulse, and check fuel pressure and go from there.
 
  #6  
Old 02-13-07, 07:22 AM
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Air meter?

How is air metered for your injection?
Is it a mass air meter with the wire and no moving parts or the flap that opens and closes with change in volume?
In either case, I would carefully disassemble and clean and look for air leaks in the duct to throttle.
The old kind with the door may not open with only cranking vacuum when they get crudded-up but will open at idle, 400 v. 800 rpm.
Also the flap is connected to contacts that move along a variable resistor. Pull the cover off and look for worn spot at low rpms.
 
  #7  
Old 02-13-07, 04:00 PM
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Tbi

If what you have looks like a carb sitting on top of the engine it is a TBI (very common with GM of that year) there should be two injectors in there. get a noid light and see if they get power. The injectors pulse you might be able to feel or hear them.
There is a solienoid in each one that moves very fast.
 

Last edited by michael van; 02-13-07 at 04:01 PM. Reason: spelling
  #8  
Old 02-13-07, 06:04 PM
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As bejay said.......I'd check codes in the computer, but one step further...........Check state display and find out what the ECM is seeing as to engine temp BEFORE starting the engine............If the ECM sees "warm/hot" when the engine's cold, could be your reason for running lean on start up
 
  #9  
Old 02-14-07, 09:14 PM
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Yes, this motor does have a throttle body on it. I'll check out everything as soon as the outside temp goes up a little, the wind chills are still around -10.
 
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