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Old 11-16-2015, 09:05 PM   #21
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Originally Posted by Rgrigutis View Post
Thanks for the replies guys. I bought the Firestone kit w/the intention of installing it myself. Passenger side was doable but drivers side w/def tank not so much. So I took it to the local guy who's an ex semi diesel mechanic and a good one. They installed but he told me the push on hoses were the weak link in the setup. Sure enough it wouldn't hold air. Took it back and one valve stem was leaking, tightened it up and ok. He reinserted the air tubing on the other side and ran it up to 80psi, bled it back down to 20 and so far, 4 hours, it's holding. He suggested abandoning the pushin hose for traditional fittings and hose. I'm considering it. Anybody else gone that route? Thanks, rick
In my opinion Your mechanic is old school when it comes to the fittings. These type of fittings have been around for years. They work like a Chinese finger. The higher the pressure the harder they grip the tube. The seal between the fitting and the tube is a rubber o-ring. This is the reason the tube needs to be cut square and the outside diameter of the tube inserted in the fitting must be like new. No scratches or nicks. The fittings should be fine. Unless of course they are of poor quality to begin with. If you have a leak, it's probably the quality of the tubes outside diameter that is being inserted in to the fitting.
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Old 11-16-2015, 09:50 PM   #22
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Installed my Firestones almost a year ago and have had no issues with the supplied fittings.
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Old 11-17-2015, 01:15 PM   #23
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Originally Posted by SouthCo View Post
Installed my Firestones almost a year ago and have had no issues with the supplied fittings.
Four years for me with no problems.

I don't run a lot of pressure in them, tho. Truck empty, about 7 to 10 psi. With the trailer about 20 seems to do the trick.
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Old 11-17-2015, 02:50 PM   #24
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The push in type are good, you just need to make good clean straight cut with a new razor blade and push them all the way home.

If you cut it with a pair of snips it could cause leaks with a deformed hose.

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Old 11-17-2015, 03:45 PM   #25
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I bought the air lift tool that makes nice square cuts on the tubes. No leaks here either.
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Old 11-17-2015, 04:37 PM   #26
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Well mine are holding air now. I suspect raising the pressure to 80 psi sealed the tubing interface. I probably should get some spare tubing just in case
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