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  1. #1

    Question 99 sonoma fuel issue

    I have a 99 sonoma with a 4.3 v6 and 180,000 miles on it. The truck starts then dies one to five seconds later. When I depress the foot throttle the truck dies instantly. I think I have finally narrowed down to the fuel system because i put fuel in the intake and it ran for 30 seconds. The pressure is at 60 psi and drops to about 56 after the truck dies so I don't think its a leak or the fuel pump. Any help is appreciated.

  2. #2


    Fuel filter first then try the pump. Sounds like a plugged filter.

  3. #3


    eather a Plugged filter or i kno on my Sonoma if Any of the Air Intake is Alittle Loose it HATES to run or wont even start 4.3 Vortex is a very picky engine
    99 Gmc Sonoma SL 4.3L 4x4 Reg Cab Long Bed

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