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My chevy truck won't start already change the fuel pump

Customer Question
twice and still won't fire. I...
my chevy truck won't start already change the fuel pump twice and still won't fire.
I think it could be wireing problems where should I start
Submitted: 2 years ago.Category: Chevy
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Answered in 1 minute by:
10/23/2015
Chevy Mechanic: Greg Jensen,
 replied 2 years ago
Greg Jensen
Category: Chevy
Satisfied Customers: 16
Experience: Master Automotive Technician at Blade Chevrolet
Verified

Hi my name is
Greg and I will try and help you. tell me what you've done so far and what your truck is doing and what happened before it failed.

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

Also which engine we are working with

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Customer reply replied 2 years ago
I am working with the 5.7 liter I have tested the fuel pressure it stands at 65 psi. the fuel filter has been changed for the second time along with the fuel pump the fuel gauge was repaired due to a bad ground we have sufficient spark fuel pressure and air flow all of the o2 sensors are new due to the previous codes in the comp. so after all of that being done I attempted to start the truck no start second diag. check pressure and power to
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

have you checked for codes?

possible crank sensor?

possible fouled plugs?

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

Have you tried spraying anything into the intake to see if it fires up?

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Customer reply replied 2 years ago
sending unit along with all sensor checks spark wires plugs and power distribution parts found several wiring repairs to fix and did so as needed truck still will not start
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

Well if you are measuring 65 psi at the test port on the fuel rail then fuel pressure likely isnt the issue.

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Customer reply replied 2 years ago
sending unit along with all sensor checks spark wires plugs and power distribution parts found several wiring repairs to fix and did so as needed truck still will not start.
Customer reply replied 2 years ago
note : The truck did start for a minute and then quit and has not been able to start since.
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

lets go back to try spraying carb type cleaner or such into the intake and see if it starts. I am trying to help figure out if we have a injector type issue or something else it takes 60 psi to start this engine bu tif the injectors are firing for some reason then we know where to start. also If you have a test light you can disconnect an injector put the test light in place of the injector and crank the engine, it should flash. as your turning over the engine.

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

like I pointed out too this could be a crank sensor issue.

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

have you removed the dist cap? you could have weak spark or incorrect spark due to it jumping those dist caps get very corroded at times and cause strange drivability issues.

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Customer reply replied 2 years ago
replaced crank sensor and cam sensor and have already have done full injector
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

and no current codes?

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Customer reply replied 2 years ago
no current codes
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

comp check?

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Customer reply replied 2 years ago
what would that do
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

tell us if your timing jumped, low or no comp and it wont start.

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Customer reply replied 2 years ago
haven't done that yet
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

tell me what originally happened with the vehicle?

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Customer reply replied 2 years ago
it was running fine lost fuel pressure and truck stopped
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

gotcha

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

what about when you hook up the pressure gauge and shut the engine off does it hold fuel pressure for awhile?

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

and you ve replaced all the injectors?

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Customer reply replied 2 years ago
no but the truck is not worth that to the owners
Chevy Mechanic: Greg Jensen,
 replied 2 years ago

Have you tried to see if It is a sec system issue?

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

does the security lamp flash?

any bcm codes?

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Chevy Mechanic: Greg Jensen,
 replied 2 years ago

Did you find the point of resolution for this issue?

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