Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
34 Posts
Discussion Starter #1
Hi! Got a 2005 GMC Envoy v6 4200 SLT Elite vehicle.
Can any one help me find the location of the fuel pressure regulator or filter? It seems that the 05 is a little different from the 03-04 models. Cause the 05 doesn't even have an external fuel filter I found out. They are calling the filter the pad at the bottom of the fuel pump, the only filter this year has supposedly.
I found this in a discussion where 2 guys are on the same page.. Could this be accurate?

Screenshot_2020-03-22-23-27-48.png



Screenshot_2020-03-22-23-21-32.png



Fuel pressure regulator?
Anyone?
Thanks!
 

·
Registered
Joined
·
1,326 Posts
The fuel pressure is on the fuel supply rail. It'll have a vacuum line attached to it.

About the fuel pump bearings..... they are cooled and lubricated by the gasoline in the tank.

Any time you let the fuel level drop below 1/4 tank or so, the upper bearing goes dry and has its life shortened.

Read that last sentence carefully. It's an expensive mistake to make.... and doing so repeatedly is wallet suicide.
 

·
Registered
2002 chevy trailblazer_lt
Joined
·
1,057 Posts
As I understand it there was a change to a returnless fuel system at some point? And no external fuel pressure regulator.
 

·
Registered
Joined
·
1,326 Posts
As I understand it there was a change to a returnless fuel system at some point? And no external fuel pressure regulator.
Of this I am not aware. Could be - but somehow I think not because of the necessity to purge the fuel lines and rails at start-up.

Air - if any gets into the system - and the injectors being the highest part of the system - gets in, it has to go somewhere - right?

So -- they send it back to the tank to de-aerate and cycle around again.

Then there's the thermal need to cool the injectors 'cause they live and work in a very hot and nasty environment.
 

·
Registered
2002 chevy trailblazer_lt
Joined
·
1,057 Posts
Here is a discussion. However, no one seems to confirm anything...
 

·
Registered
2004 gmc envoy_slt_xl
Joined
·
77 Posts
All GM 360 vehicles from 2005-2009 had a return less fuel system. The regulator and the filter are part of the fuel pump sending unit assembly. That's also why you will only see 1 fuel line and 1 vent line coming out of the top of the pump assembly.
 

·
Registered
White 2002 Trailblazer EXT; Dark Charcoal/Green 2005 Trailblazer EXT
Joined
·
126 Posts
All GM 360 vehicles from 2005-2009 had a return less fuel system. The regulator and the filter are part of the fuel pump sending unit assembly. That's also why you will only see 1 fuel line and 1 vent line coming out of the top of the pump assembly.
And if the fuel pump dies, it can send plastic and metal pieces up into the fuel rail and screw the injectors because gm's "bean counters" decided to save a dollar or two by deleting the fuel filter between the fuel pump and the engine in 2005. Thank God that I have the earlier model, because otherwise, I'd be finding a way to put a filter in between the tank and engine. I had dealt with a friend's vehicle that only had the "sock" and the fuel pump crapped out and took the injectors with it. Sadly, you couldn't tell about the injectors until AFTER you changed the pump and started the vehicle up. That's when all of the pump pieces went to the injectors and screwed them. We ended up taking the tank back out, unhooking the lines and backflushing Berryman B12 thru the fuel rails and lines before we put the new injectors in. Very time consuming and very costly. DUMB MOVE, GM!
 

·
Registered
2004 chevy trailblazer_lt
Joined
·
973 Posts
2005 TrailBlazer with the 4.2L engine has the fuel pressure regulator incorporated into the fuel pump assembly which is in the gas tank.
 
  • Like
Reactions: TJBaker
1 - 10 of 10 Posts
Top