fuel filter change

[max3456]

Are any special tools needed to replace the fuel filter on a 04 TB? How are the fuel lines connected? Quick connectors? Any suggestions on fuel filters?
Thanks for your help.

[rodeo02]

I've heard that you have to drop the tank skid plate for clearance. No biggie from what I hear. Just normal clamps for the filter. My 2005 has the filter in the tank.

Joel

[KGaugh1805]

Have you changed your filter on the '05 yet? I have same here and interested in knowing where and how easy it is to do so?

[rodeo02]

There's no fuel filter to change on the 2005+ TB's (as far as I know). It's inside the tank. Someone posted a pic of a typical cannister looking filter, but I don't see how that's possible for an in-tank filter. In-tankers are almost always a big sock on the pump suction. You can replace the sock on a pump changeout.

Joel

[dmince]

The filter on my '02 is located inside the frame rail on the drivers side. Small clamp with a very rusted screw hold it on. You can change it with a pair of needle nose. Be carefull with the plastic clips though.

[max3456]

I recently changed the fuel filter on my 04 and it was very easy. One screw and the two fuel line clips. It is mounted on a frame support just in front of the fuel tank. $22.00.

[coolcloo1019]

On my old car, when changing the fuel filter, I used to take out the fuel filter fuse, crank over the engine a few times to get all the fuel and pressure out of the lines and THEN disconnect the lines on the filter so I didn't get sprayed. Should I do the same thing on the Trailblazer? Thanks guys.

[maxwedge]

Originally Posted by coolcloo1019

On my old car, when changing the fuel filter, I used to take out the fuel filter fuse, crank over the engine a few times to get all the fuel and pressure out of the lines and THEN disconnect the lines on the filter so I didn't get sprayed. Should I do the same thing on the Trailblazer? Thanks guys.

Pretty old thread here, but anyway there is a pressure bleed off valve next to the fuel filter.

[Blue Bowtie]

What is the standing fuel pressure supposed to be on those? I know the '05 models have pressure controlled via in tank FMU and not a remote FPR, but the '04s are just the plain old, supply/regulator/return line system.

[maxwedge]

Originally Posted by Blue Bowtie

What is the standing fuel pressure supposed to be on those? I know the '05 models have pressure controlled via in tank FMU and not a remote FPR, but the '04s are just the plain old, supply/regulator/return line system.

I am driving a 2002 and don't know the fp specs, some mod huh!!?? I believe it is 55-60.

[Blue Bowtie]

That's probably right. I've got one (2004) at 56-57 PSIG rock steady. It has the typical "no power in second gear" problem. Time for a reflash, I'm thinking.

[rodeo02]

Originally Posted by Blue Bowtie

..I know the '05 models have pressure controlled via in tank FMU and not a remote FPR, but the '04s are just the plain old, supply/regulator/return line system.

Good info! I was wondering why I could not locate a FPR on the fuel rail of my 2005. There's only a shraeder valve about where the FPR *used* to be. Interesting. What is FMU?

Thanks
Joel

[maxwedge]

Originally Posted by rodeo02

Good info! I was wondering why I could not locate a FPR on the fuel rail of my 2005. There's only a shraeder valve about where the FPR *used* to be. Interesting. What is FMU?

Thanks
Joel

Pump voltage is increased /deceased on demand by the pcm based on engine load, the system is returnless and of course no regulator, no inline filter either.Actually I believe the pump is pulse width modulated by the pcm rather than actual voltage changes to the pump, I will look into that. FMU, Fuel Management Unit.

[rodeo02]

Originally Posted by maxwedge

..I believe the pump is pulse width modulated by the pcm rather than actual voltage changes to the pump, I will look into that. FMU, Fuel Management Unit.

I guess the good thing is less plumbing, bad thing is anything with "management unit" in it sounds expensive !

Thanks
Joel

[16th hippy]

it is expensive....that "little black box" is one of the more expensive parts of a "modern" car. EBCM's(Electronic Brake Control Module) are worse. did one on a Tahoe the other day, over $900, JUST FOR THE PART!