Question about Cars & Trucks
Have you checked fuel pressure with a gauge ? Vortec engines require 65+ psi to run.
Posted on Aug 01, 2013
Testimonial: "no i havent but wouldnt it start by dropping come gas intot the throttle body and run untill that gas was bruned out ...i meen it starts now after a while just starving for gas then dies "
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Posted on Jan 02, 2017
Sounds to me like the fuel pump is worn out. They DO wear out. And even though they seem to be working, the brushes in the electric fuel pump may not be contacting all the commutator, thus making the pump weak. It may start the motor but can't maintain normal running pressure (27-35psi). Have you run the car out of gas shortly before this problem surfaced? If you have then it's your fuel pump. It was damaged when the tank ran dry. Even though the pump may seem to be working, it's still badly damaged and needs to be replaced.
Just as Matmenzies has stated, get a fuel pressure gauge and test the pressure. I'd start with a complete check of all your vacuum lines. Check for cracks on the vacuum hose that connects to fuel pressure regulator on the fuel rail. Also, if you can, get a hand operated vacuum pump to check the regulator. If you can place a vacuum on the regulator and it holds, I'd say move on the fuel pump and check it.
BTW, if the fuel filter has been changed, you may want to check to see if it was installed backwards! Some fuel filters are valved and will cause symptoms like this. However, this is an immediately noticeable mistake and you haven't provided enough info for me to say more. I'd pull it and check that it has any flow at all. You could have sucked in a big dirt ball and blown it right into the new filter, effectively stopping fuel flow. Then I'd blow out the fuel lines, just to be sure.
Start with these 2 things and post what you find. We'll go from there.
Posted on Jul 09, 2009
You will want to check the fuel filter you installed to make sure that it is installed correctly. Most of the replacements are a one way filter to allow fuel to go from the tank to the engine but to not go the other direction so if by chance it is installed backwards then you would have this problem.
Posted on Mar 19, 2013
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