Which vacuum line do you use to suck stuff up?

[Skunksmash]

There are probly hundreds of products out there that clean the engine (or something) by being sucked up through one of the vacuum lines. You just buy the product and put it in a bottle, (if necessary) and then unhook the proper vacuum line from your truck and feed it down into the bottle with the liquid in it. Seafoam comes to mind as one of these. Anyway, which vacuum line do you use for all this stuff? Please be specific on the line's location as I am a noob. Also keep in mind I have a TBI truck so it may be different than the carb'd ones.

[Captkaos]

Use the hose that goes to the vaccum booster.

[Skunksmash]

The vacuum booster is not that little carbon canister thing is it? Like I said I have little experience with all this vacuum stuff. Perhaps someone has a picture with the line shown in it?

[Layne]

No picture, but that big round thing behind where you put in your brake fluid is the booster. It has a one-way check valve connected to a vac. line usually leading to the carb or intake manifold.

[VileZambonie]

You need a very small vacuum line. Use one directly off the carb and sip it in

[Captkaos]

It's TBI Vile, Booster won't work as it goes into the manifold

You could pull it of EVAP or PVC on the front of the TBI.

[Layne]

So you'd want to go through the tbi unit as well to clean that, right?

[VileZambonie]

http://www.youtube.com/watch?v=D11ZVYwj62w&feature=player_embedded

[Captkaos]

The TBI isn't as complicated as you might think.  The body where the shafts are is basically just an empty void where vacuum is drawn either manifold (under the blades) or ported (above blades)

[Layne]

It looks like that guy used the brake booster line, then killed the motor though the tbi. I think it'd be hard to get 1/3 into everything. I suppose you wouldn't have to be exact tho.

[84ramcharger]

It looks like that guy used the brake booster line, then killed the motor though the tbi. I think it'd be hard to get 1/3 into everything. I suppose you wouldn't have to be exact tho.

It's pretty easy to get it all in , Some guys I used to work with loved seafoaming anything they could get there hands on . I've done it a few times myself and I used the brake booster liner to pour it in then start it and quickly dump a 1/3 down the carb , let it stall then let it sit for a hr . I don't throw it in the oil though

[Layne]

I seafoam my citation all the time, but I just dump it down the tbi unit and the gas tank at the gas station. After I'm filled I'll crank for a minute and then drive off. I'm guessing I do it wrong

[84ramcharger]

I seafoam my citation all the time, but I just dump it down the tbi unit and the gas tank at the gas station. After I'm filled I'll crank for a minute and then drive off. I'm guessing I do it wrong

I would say what your doing isn't wrong , might not be as effective as going down a vacuum line though .

[Captkaos]

I would drain the oil after I put it in there.

[VileZambonie]

I used to use GM top engine cleaner all the time. Seafoam does the same but I don't think it's as strong. If you have a Carb or TBI system get the engine hot and pour it slowly into the tbi or carb at about 800RPM. Use about 1/2 the can and then pour it in quicker to stall the engine (not hydrolock it!). Let it soak for about 15 minutes. Start it up and run the rest through it. When you're done drive it til it burns off and do an oil change.

If you have a port fuel system use a small vacuum hose and let it sip it in. Vary the engine speed from about 800-1000RPM.