Help tracking down air leak

If you want to check your system further, you can introduce red food coloring into your air system. This will show you any additional leaks over time. The food coloring needs to be put in the system after the air drier. This is how we do fire trucks which demand ultra tight air systems for quickness out of the gate!

 

There is a new one...

 

Run the tanks up to full pressure. Then note the level of each tank. Then simply go out each hour and look and see what the level is. If it is within DOT specs you should be fine, but bothersum.

If you find the tanks are draining fast then you have a air leak. I had a FL that lost 50 lbs in 3 minutes.. was told that is fine so long as the air stays above 100lbs when running.. of course by a mechanic who is not behind the wheel... stood my ground and found a loose nut on the air lines on the back of the cab for the trailer, plus the fittings on the primary tank. tightened and replaced the tape on the fittings,, after that, could go 2 days and not loose any air sitting..

check your firewall also... many air lines there also.. could be an air line that is rubbed through... check your air compresser, make sure the blow by valve (releases air over 125 lbs) is not bad.

mark

 

Just fart in the tanks and smell for the leak like Poppy.

 

I just found my leak this week, in noisy truckstops I could never hear anything. But unloaded in a remote and quiet industrial park and could finally hear it. It was the compression fitting on the plastic line at the tail of the transmission.
A previous truck I had leaked at a line on the top of the transmission, that one drove me nuts to find. Ended up coming down from the rubber boot at the base of the gearshift to fix it.

 

Woohooooo! Problem solved! For now!

 

Did it ever need doing it more than once ?