Can I Use This Port For A Vacuum Gauge?

SEP · April 3, 2009

I want to install a vacuum gauge to help me monitor fuel ecenomy and i need to know if i can use this port to plug the gauge to. Anyone ever used this port? Do i just break off the unecessery plastic?

Here's a pic of the port:

Zembonez · April 3, 2009

Bump

It LOOKS like a vacuum port but it's hard to tell much about where / what it is from that pic. If it is a vacuum port, I'd take a small drill bit and drill out the center rather than break anything off. Breaking stuff like that tends to end up with more breakage than you were prepared for and then you're really screwed.

tyhuck · March 2, 2011

I know how you feel. I fell victim to the Magnetic Fuel Atomizer (magnets on the fuel line), the "Tornado", and some other wasted poducts. That was back when I was in college and young, dumb, and broke. Live and learn I guess.

What gets me is that stuff on Ebay that sells for less than $5 and claims to get you 100MPG+. Thats about as rediculous as the $20 power chip that claims 180HP.

SEP · April 4, 2009

I wonder if i can take the cap (at least it look like one) off and work it on a bench instead of under the hood.

tyhuck · March 2, 2011

Did you ever find the vacuum port for your guage? Im wanting to install a vac guage as well.

[email protected] · March 2, 2011

That place he listed on the back right top of the intake will do just fine, it's a vacuum port that's not used when the truck didn't come equipped with the A.I.R. system.

[email protected] · March 2, 2011

Oh yeah, and it's a resistor that you can stick in the iat and gain at MOST 3 hp, and fuel economy actually goes down. Yeah that crap, they get those resistors from radio shack all day long for a couple cents and then sell them for around 3 bucks, I know because I fell for that stuff also.

MikeInCtown · April 4, 2009

I looked at mine yesterday and it's too big to be a port for checking vacuum. At the front of the intake is a part of some sort with a cap that looks more like a place for vacuum hookup than anywhere else on the manifold.

tyhuck · March 2, 2011

This spot?

Is the Vortec beauty cover all that is removed in that pic?

Sorry for so many questions, but Ive got more experience with the SBC Vortec motors than the LS based engines.

[email protected] · March 2, 2011

That spot and the cover is removed. Edit: oh yeah, and by "right" I mean passenger side.

tyhuck · March 2, 2011

and thats the same on all 99+ 5.3 engines? Mines an 05.

[email protected] · March 2, 2011

As far as I know, atleast for 99-07. Stop asking questions and get out there and look for it.

tyhuck · March 2, 2011

I would, but thats like a 50' walk to the garage.

I looked and found it. The cap doesnt look like it comes off though. Ill have to look closer. Mabye SEP will chime in. Hopefully he got the guage installed and will post up some pictures.

[email protected] · March 2, 2011

Trust me, just take a pair of pliers and twist it'll snap right off, I've did it on mine for the hho generator I had but I took a rubber hose and blocked it back off.