Anyone else's truck "fart" (not turbo related)

[Sno-Mow]

So I've noticed that when I go to hit the key and wait for the injectors and glow plugs to cycle my truck "farts" just before all the noise stops.

It sounds like its coming from the oil filter area and every time I think about checking it out there's nobody around to turn the key while I listen.

My truck DOES have the Blue spring upgrade so doubt its that.

[sinner6.0L]

I know what noise you're talking about I just can't remember if it's a 6.0 that does it. Never really paid attention

Maybe a blend door in the dash moving into position?

[Sno-Mow]

No definitely coming from oil or fuel filter region.

[Locke6169]

Yeah mine does it too but not every time. I dont know where its coming from

[SICKS-O]

it is the abs pump motor

[Sno-Mow]

Originally Posted by SICKS-O

it is the abs pump motor

Does this mean the pump is bad? I have noticed that I loose my pedal from time to time but was thinking this was the master. My 06 never "farted" but my 03 does.