boost gauge is leaking!!WTF

so i installed my boost gauge and had it on my dash for a week until i got my gauge pod in, so i go to pick it up and the boost line going into the back of the gauge falls out lol. so i stuck it back and and both sides of the fittings(the hose and the gauge) have teflon tape threaded on them. after my install idle vaccum shows about 12-14 and makes a hissing noise :( so i took it out and threw on some JB weld and let it sit for a good 2 hours i started driving and it was back to normal for about 5 min then it busted a leak again. my question is, is my little crown thing in the fitting the wrong way? i have a faze gauge btw(dont tell me that was my mistake :sunglasse ) is there a diagram to install the stupid hose correctly? because mine seems to ultra suck. -Ryan

what kind of fitting is it? if its just a barbed fitting that you slide the hose over you may need to use a hose clamp to hold it tight

no its not a barbed fitting its like this http://im1.shutterfly.com/procserv/47b5da06b3127cce910e17a6c83700000016108BYsnLRuxbM

is your plastic boost line going all the way through the "crown thing" or is it just stuck in there? i put mine through it cuz when you screw everything together it crimps that "crown thing" and holds everything tight.

i put the boost line through the crown but now that i think about it i only tightened it hand tight am i supposed to wrench it on? if so i feel like an idiot

On mine, the "crown thing" you are referring to is a compression fitting. You will probably need to get a new one at the hardware store. But your's might be different. Yes, you do need to tighten it down with a wrench to compress the fitting.

yeah, you have to sench that thing on tight! when i installed my autometer boost gauge i couldntt for the life of me figure out how the tube stayed in place. tighten the thing as tight as you can with a wrench and you seal it up..

Also, quit using the shitty plastic tube!!

That goes for all of ya. ;)

Also, quit using the shitty plastic tube!!

That goes for all of ya. ;)


Are you talking about the small diameter hard plastic tube you get with the boost gauge? If so, what should we use instead, and why?

Yeah why?

I have an Autometer boost gauge and I didn't have to wrench it down. I just tightened it with my hand annd it's fine. The picture you drew looks like half a compression fitting. At least on mine it has a tapered end on both sides. You could try cutting off the end of your hose to make sure that its not causing the problem and try again with the newly cut end.

You defintely should be using a wrench on a compression fitting. You should not however be tightening down as hard as you can. Just snug. You want to just drive that ferrule into the tubing enough to create a seal, but not enough to noticeably reduce the inside diameter. This is why many 1/8th inch tubing applications will use metal inserts, to preserve the tubings inside diameter.

If its leaking, buy a new ferrule at a local hardware store. Several near me carry 1/8th inch parts. Cut the tube to get a fresh end on it, install the nut, the ferrule, and try again. Make sure you are holding the tube into the connector as you tighten so it doesnt get squeezed out.

If the guage has an NPT type fitting on the back and a compression fitting adapter, I would go to a hard tubing dosconnect like the one shown on my site. Some poeple swap to a hose barb and run soft tubing. If its a compression fitting built right into the guage, you have no choice but to use that.

Some poeple swap to a hose barb and run soft tubing.
I sure did. THe stock plastic gauge line was cracked from the get-go so I went to the rubber line. Rubber will become brittle over time, but I never have to worry about the plastic getting near something hot under the hood near the T or kinking.

If you look on mcmaster.com or similar there are other materials used in making the vac tubing. Some might be better suited to our application, but no one bothers to look into it or try anything new. I like the nylon tubing, but it can break with time. Mine has lasted 5 years so far. Copper will also fatigue from motor movement. Oh well.

If the guage has an NPT type fitting on the back and a compression fitting adapter, I would go to a hard tubing dosconnect like the one shown on my site.

I used those quick disconnect fittings on my paintball gun with what they call "macro line" which is kind of like oversized boost gauge hose. A lot of people use it and it works fine but with me it leaked big time. I switched back to my stock ss line and no leaks. I think my problem was that the hose had to curve pretty sharp right after it came out of the fitting so it might have created a little space for air.

I have seen those fittings. A sharp curve can cause problems, that line is stiff. The trick is in angling the fittings strategically, but its not always possible with all the different parts and configurations out there. Luckily for the cars, and industrial equipment, this is rarely a problem.

Just a side note, everyone else in the POSR group has moved on to paintball without me :icon16: I'm the last asshole left struggling with these POS cars.

They got out of DSMs? *insert shocked face here* That sucks! But paintballing is great fun, you should give it a try.

Is there a special 'T' connection for this small plastic hose?? Where does it tap into a 1g? (because a normal size black rubber line would tap in fine...where does this small diameter hose tap?!?!)