Question about 1996 GMC Safari

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Hard cold start 96 safari

Engine needs long cranking cold to get fuel to engine, runs fine and starts fine if not sitting too long. Fuel pump or pulsator bad? How to replace them?

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Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.

Posted on Jan 17, 2009

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Posted on Jan 02, 2017

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1 Answer

Cold starting


Most common reason for no start cold with a lack of fuel is the fuel pump relay or the check valve in the pump.
The fuel line should have some pressure it it after sitting overnight. If not, the check valve in the pump may have let fuel flow back into the tank. It would take a few minutes of cranking to get it started.
Also, if the fuel pump relay is not working, the pump would not get power until the engine has oil pressure.

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Try replacing the fuel filter, but it sounds like you have a weak fuel pump. Your cold start pressure should be 62-65 psi and drop about 5 psi when the engine is running. Anything less then 62 psi is going to cause you to have starting issues, you can also test your fuel pump by blocking off the return line to see if you get 75-78 PSI. this is just a test to see if your fuel pump is still good. If you have less then that with the return line blocked off, replace your fuel pump but check your ground wire first. The ground wire is separate from the wire harness and grounded to the frame and a bad ground will give you a weak pump.
Thank you for using Fixya and good luck

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you have to remove the tank from vehicle and if you do this replace all parts sending unit pump sock and pulsator

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1 Answer

Long cold cranking before start


You have a very common problem; your fuel pump needs replaced. Inside the outlet of the fuel pump is a "check valve", that holds fuel pressure from draining back to the tank. What you have happening is the fuel has emptied from the lines and the injector rail; the long cranking period is the time that it takes for the fuel to be pumped back to the engine. Replace the fuel pump & your problem will go away.

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hi there i do believe you have a faulty or leaking injector because it should stay pressurized when you shut off the engine

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