Air line to fill tires

It's really a good idea to have one of those in case of a tow. I have had a couple of buses I have driven break down and be towed and my MH tried to burn up on the freeway and had to be towed. On the MH, the driver asked if I had an air outlet because if I didn't it would be extra for having to install one. (the flex pipe from the muffler to the outlet burned through at a 90 degree bend and tried to burn up the right rear corner of the MH 60 miles north of Grants Pass on I-5)

Most diesel pushers have a air outlet in the engine compartment in case you need to be towed to release the brakes. I have one in the rear and one in a compartment in the front.



Make one of These and it makes it very easy to inflate tires.

Kayteg1 wrote:
BUT ... cut in usually is below 100psi.
Meaning if you need 105psi, even with engine running you will never get there, unless you go to pedals and fan brakes to get compressor engage again.

Or you could simply install this nifty three way ball valve at the end of your hose to bleed down the air and kick back on the compressor without running back and forth to fan the brakes:

fishingbob61 wrote:
Thank all of you for your replies, I am going to buy a small compresser and not mess with a air line.

That's what I did...much easier than using the on board system.

11178adm wrote:
if you cant find it it is fairly easy to install one find your dry air tank
the wet tank is the one the air from the air comp or air dryer goes to first
the dry tank feeds from the wet tank find a plug that is does not have a fitting in it preferably one not on the bottom of the tank drain the air system before removing the plug install a female quick coupler, use either Teflon tape or liquid pipe sealer on the fittings if needed for access you can install a hose and route it for convenient access and to avoid chaffing the easiest hose to work with would be plastic air line and should be available at any heavy truck dealer or fleet supply store if you need to get new hose you will need enough male and female couplers for the tank, hose and the air chuck also make sure the hose is long enough to reach the tires furthest from the connection

Warning: if you mess this up, you could damage your air system which controls all your brakes and die in a cataclysmic inferno on the highway. YMMV.

Thank all of you for your replies, I am going to buy a small compresser and not mess with a air line.

I do check mine before every trip, but it has been several years since I have had to add air. Three years in the fronts and two years in the rear. Before they were replaced, I would have to add air every two to three months. I did use my onboard air and found that it was slow, but worked. Also use the air tank for bicycle,lawn tractor tires, car tires and the kids swimming pool and it usually works great w/o having to run the engine.

Well,
The way I look at is, we're not trying to fill a 22.5 from ZERO pounds pressure to 120 psi. All I think the OP and many of us are trying to accomplish is "topping" them off. Other than a large industrial compressor with a massive storage tank, i.e. truck tire shop, any repair facility etc. ANY compressor, be it the one on most diesel pushers or, even the small, 120VAC ones that have been mentioned, will have a hard time putting a large amount of volume into either a 19.5 or 22.5 tire, from a low pressure starting point.

But, if you're running say, 95 (just an example)(per established weight measurements) and your tire is sitting at say, 90 in the morning, the 120VAC unit will work just fine. And, if you don't mind running the engine and want to use the engine driven one, it will work too but, a bit more noisy.

Unless a tire or set of tires has some extensive leak(s), it won't drop that much anyway so, "topping" them or one off, is not a big deal with a smaller 120VAC unit like the Sears or Porter Cable unit that I and many have.
Scott

For timely inflation go to truck stop, where they have 180 psi with 50 gallons or bigger tanks.
Crucial point is your tire required pressure.
Most DP have compressor pumping 120psi cut off.
BUT ... cut in usually is below 100psi.
Meaning if you need 105psi, even with engine running you will never get there, unless you go to pedals and fan brakes to get compressor engage again.
My 22.5 tires hold the pressure for 2 years so I never had issue to inflate on the road.
At home I have oil-less compressor for cleaner air and locking chuck.
I set the compressor regulator to desire pressure, lock the chuck on the tire and go for lunch.

I agree with DSDP Don. Even my 150lb 6 gal pancake compressor struggles to air up the tires in a timely fashion, but it is much better that the system on my DP.