No start condition that is fuel related pllleeaasee help!

Tiny
SOCCERDUDE1080
  • MEMBER
  • GMC SONOMA
My 1995 Gmc Sonoma with a 4.3 liter cpi v-6 will not start I replaced the fuel pump the crankshaft position sensor and I know the problem is fuel related because the engine has spark and will run on starting fluid if sprayed into the manifold so does this mean the injector is bad or what also it gets pressure to the port for the pressure gauge before the injector plenum the syptoms were if it started on the first try you were good but if not it wouldnt start until it was left to sit and now it wont start at all
Saturday, January 6th, 2007 AT 11:37 PM

11 Replies

Tiny
SERVICE WRITER
  • MECHANIC
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Did you replace the filter also?
What brand of fuel pump?
Can you hear the fuel pump run?
CAn you check fuel pressure?
These do have a problem with the spyder or octopus, not sure of the real name. PArt of the injection anyways.
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Sunday, January 7th, 2007 AT 6:59 AM
Tiny
SOCCERDUDE1080
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Yes I replaced the filter and if u turn the key you can hear the pump run and the pressure is good
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Sunday, January 7th, 2007 AT 7:51 AM
Tiny
CARUNDELL
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Hey soccer,
What is the exact fuel pressure? The only reason I ask is the fuel pump for the vortec motor and non vortec are similar on size and shape, yet the pressure output is drastically different! The spyder injector usually fails "open" meaning it would be dumping fuel vice no fuel, though it is possible for it to fail completely, it is unlikely Let me know!

Chris
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Sunday, January 7th, 2007 AT 8:11 AM
Tiny
SOCCERDUDE1080
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The truck has sat a while and I am not driving it but the pressure was 40 something
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Sunday, January 7th, 2007 AT 5:49 PM
Tiny
SERVICE WRITER
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Try to be more specific on the pressure, a couple pounds can make a difference. Recheck if your not sure and want to get this solved. :)
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Sunday, January 7th, 2007 AT 6:03 PM
Tiny
SOCCERDUDE1080
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Sorry I dont have a pressure gauge I used my grandfathers so I dont have one on hand im probably going to buy a scan tool this week but please keep giving me sugestions and help thanks
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Sunday, January 7th, 2007 AT 6:26 PM
Tiny
SERVICE WRITER
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A scan tool can't tell you the pressure. We will be here :)
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Sunday, January 7th, 2007 AT 6:27 PM
Tiny
SOCCERDUDE1080
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I know it cant tell pressure I want to see what error code it gives me if any ill probably buy a gauge also
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Sunday, January 7th, 2007 AT 7:01 PM
Tiny
SERVICE WRITER
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Gotcha! :)
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Sunday, January 7th, 2007 AT 7:02 PM
Tiny
SOCCERDUDE1080
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Cpi only has one injector that feeds each cylinder correct anyway if the pressure is correct would I assume its the fuel pressure regulator/injector or is their any other fuel system component between the gauge port and the injector
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Sunday, January 7th, 2007 AT 7:15 PM
Tiny
CARUNDELL
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Hey soccer,
Definitely ensure you've got the proper fuel pressure first, pretty sure on that model its gotta be above 50 psi or so

Chris
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Tuesday, January 9th, 2007 AT 11:39 AM

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