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05 GMC sirerra cranking time before start up,frp desired…

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05 GMC sirerra long cranking...
05 GMC sirerra long cranking time before start up,frp desired 5801 , actual is 217 with key on cranking goes from 490, to 1500 psi and finally starts after 8-30 Sec depends if first start or after running awhile, should I check injectors or lift pump
Submitted: 2 years ago.Category: GM
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Answered in 39 minutes by:
2/22/2016
GM Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: GM
Satisfied Customers: 16,706
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Hi, my name is ***** ***** is usually a bad fuel injector returning too much fuel to the tank on start up, it will drop the rail pressure and pressure to all the injectors, have done a return fuel test yet?

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Customer reply replied 2 years ago
No, do I need to take off the lines on driver side and put one in a container and take out which relay, and how much is to much fuel
GM Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago

yes, and then crank it over , the fuel return should be less than 11 ml, if it is any more, then you hav one or more injectors returning too much fuel, if its lower than 11 ml, then suspect the lift pump, another test is to push the black button on top of the lift pump to prime it up before trying to start, if it starts right up then, replace the lift pump,Tim

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GM Mechanic: Tim Mohr, ASE MASTER TECH replied 2 years ago

most of the time, its a bad injector,Tim

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