I didn't see one either I wanted to see it I would have thought once you turn the key off naturally the pressure will drop unless there is a one way valve.
According to factory shop manual for a 2004 GMC Envoy/ Chevrolet Trailblazer, Buick Rainer, the pressure is checked with key on and engine off and should be 50-57psi. It states to activate fuel pump, turn key on without starting engine, turn on key at least 3 times to activate pump. The third time activating pump, check pressure. The pump will activate, but with engine not running, it will stop. When the pump stops, it should stabilize, hold pressure and pressure should not drop more than 5psi This is procedure for 2004 and other years could be different. My 2004 Envoy did have port by the fuel filter near tank and had a black twist on cap covering it. There is a green cap under the hood, but that is for fuel vapor/evap check.
Had the same issue with my 02 4 runner. Picked up a bad load of fuel. Fortunately my fuel filter is on the frame rail. Replaced and issue solved. Also...I cut the old filter and it was clogged ... That's my Huckleberry!!
Nathan, the fuel pump is electronic not mechanical. You don't have to crank it. Turn the key on twice wait 5 seconds for the pressure to build and it should start right away. If not.....fuel pump.
Thanks for the valuable information. I have a problem that the car was working, and after I pressed the gasoline, the car stopped and no longer works. I checked everything, but I did not find a solution to the problem.
Enjoy your videos, a possible quick fix you might want to try and is free is to take a deadblow hammer to the bottom of your tank right where the fuel pump pickup is and give it a few “love taps” nothing too aggressive but just enough to jiggle the fuel pump a bit so that whatever is stuck in the check valve assembly might possibly shake loose. A healthy dose of sea foam in the tank with low level of gas can’t hurt either those 2 things may also help and prevent dropping the tank. The reason I say that is by the pressure gauge it looks like the pump builds pressure very well but the pressure just reversed back into the tank and not holding press to the rail. Best of luck !
It's making pressure so how could it be the fuel pump and the regulator is what you pulled the fuel lines off of for your gauge it's not in the tank and there's a test port that comes off the fuel filter under the driver's door on the frame
Hi, I had this problem, but it Was not the fuel pump check valve, in my car the problem was the oring that conect the fuel pump with the cover, it crack and start to leak the pressure, change the oring and it work fine again, but thanks to this video I found the problem.
My 04 Trailblazer has a fuel pressure of 49 psi with key ON and about 52 psi on idle i read that fuel pressure on these trucks should be between 50-57 psi should be worried for the 1 psi below spec?
I have a 2000 blazer just sputtered & stopped running while I was driving. It has spark & fuel does come out of the port on the rail. I have to get a gauge to check pressure. My question how to tell if it is the fuel pump or the fuel regulator? Thank you in advance for your help. Joe Z
@@FixingWithPassion If there is a valve under the Trailblazer, it is plastic lines/valve has a metal schrader valve inside it. It has a plastic cap covering valve, shouldn't be rusted.
