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2008 5.3L Fuel Pressure test procedure
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Question
Mossyoakglock
What is the correct procedure for testing the fuel pump/fuel pressure?
I suspect I have a fuel pump going out and I want to test the system. I have a Haynes at home but haven't looked at it yet to see if it has the procedure or if the shows the correct PSI numbers.
On a cold start the engine will stumble and feel like a miss. It will idle somewhat rough for about 2-3 seconds and then smooth out and idle normal. It never does it throughout the day no matter how many times I restart the truck. It doesn't do this every morning (or after a long sit for 7-8 hrs or more) so it is hard to tell when it might do it.
I'm not sure if there is a different procedure to test certain things. Since mine only does it on the first start of the day do I need to cycle the key to on with truck off or start truck right away? If I just turn the truck on (with engine off) wouldn't it prime the pump so when I do start it, it gives the reading like the pump is ok? Shouldn't I start it right away and see what the pressure does?
I get no codes either. The dealer wants $90 to test it so I want to see if I can test the pressure myself first before taking it to them.
Edited by MossyoakglockLink to comment
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