Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
is the fuel filter new ?
this can be caused by the filter plugged up and over straining the pump
if changing the fuel filter the truck still does this the only thing left to cause this fuel pressure issue is a bad fuel pump and when the old one is removed inspect the bottom of the fuel tank and be sure there is no debris in the bottom which could cause pump fuel pump delivery
usually a fuel pump issue itself
to see if it is a regulator you get the truck to act up then shut it off and pull the vacuum line of the regulator at the fuel rail and if you see any fuel coming out of it the regulator is bad
check that before the fuel pump is changed
with the engine off and look for fuel
2004 was an odd year if it has a changeable fuel filter under the drivers side frame rail
early 2004's had them and late 2004's did not
do a visual under the drivers side inner frame rail if you do not see a fuel filter on the fuel line in that area of the frame then this must be a late 2004 without a changeable fuel filter
is there any fuel pressure at all when key ON engine OFF ? and is the fuel pump running in the tank for the 2 second prime and when cranking it over ?
i do not think you did anything wrong at all..filter only goes on one way
i agree with you
if there is NO pressure and the pump is running either the pump is bad or the fuel tank is out of fuel due to a fuel sender reading the wrong fuel level in the tank