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Old 03-21-2023, 12:57 PM   #1
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Air line to air up tires

I run a line off the bottom of the tank resivoir so I could air up my tires when needed. There was 2 plugs on bottom I removed the inside plug but there is no air coming out. Both my gages read 120 I can pull the manual release and air exhaust. Why no air at plug 2004 coachman
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Old 03-21-2023, 01:07 PM   #2
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Plugged with rust. Don't poke it loose under pressure as you risk a shrapnel injury.
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Old 03-21-2023, 02:06 PM   #3
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I'm not sure I'd want to tap into the bottom of a tank. Any air is likely to have moisture in it, which isn't great for filling tires with. Water vapor is a big factor in tire pressure changes with temperature.
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Old 03-21-2023, 02:20 PM   #4
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The tank your looking at is a double chamber tank, the small section is the wet tank. You should see a seam around it. It doesn't have a gauge but will have air in it when the engine is running.

It should have air in it while parked but you may have a leak.

Drain the system and tap into the other tank. Take care that the fitting you use isn't to low. If it gets broken, you loose much of your brake pressure.
To be legal, you should use a pressure protection valve. It stops air flow below 70 psi, Saving it for the brakes.
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Old 03-21-2023, 02:29 PM   #5
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You should have a access valve at the front of your coach . This valve is so the tow driver can activate your air brakes if towed . Put a female air fitting there and 50' of air hose and your good to go .
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Old 03-21-2023, 02:29 PM   #6
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My thought for the day, lol.
Nothing is really simple unless you do it all the time.

I've done it, you've done it. You start a simple project that should just go slam, bam,. But no. It always , at least for me, involves more than what one thinks is the obvious.
Ya know what I mean??
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Old 03-21-2023, 03:40 PM   #7
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My thought for the day, lol.
Nothing is really simple unless you do it all the time.

I've done it, you've done it. You start a simple project that should just go slam, bam,. But no. It always , at least for me, involves more than what one thinks is the obvious.
Ya know what I mean??
Amen, brother!
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Old 03-21-2023, 06:43 PM   #8
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Why don't you save the effort of tapping into the tank and just buy a small portable compressor for hundred an half?. Safer and if you are running higher pressure, you don't have to wait for the compressor on your engine to catch up as it reaches pressure and blows off.
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Old 03-21-2023, 07:04 PM   #9
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I'm not sure I'd want to tap into the bottom of a tank. Any air is likely to have moisture in it, which isn't great for filling tires with. Water vapor is a big factor in tire pressure changes with temperature.
If you find moisture in your compressed air storage tank, you've been neglecting air dryer maintenance.


I don' use MH compressed air for anything else, the compressor is simply too expensive. I have a $100 150psi pancake compressor for everything else, and a 12V150psi compressor for off-road use.
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Old 03-21-2023, 08:49 PM   #10
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You should be able to find the air connector mine is in front propane bay. These are often T-style or automotive quick connect not the most popular air tool type. The higher over 100 psi the tires the worse it works out because of load and unload of the air system. There's a such thing as pneumatic booster most will double air pressure. I thought was smart to look into one but guys on here had already done it. You can find good deals on EBay. An air compressor is by far the most popular. One that can supply over 125psi for same reason. Slow fill when differential is close to tire and before compressor loads back up.
But you should clear the drain valves. Getting rust sand blasted hurts and can get embedded under skin, been there don't that. Gloves help a bent solid wire can get your hand out of the way and wear safety glasses. You don't want to be under DP coach messing with air unless up on ramps high enough with bags dumped to not crush you .
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Old 03-21-2023, 08:55 PM   #11
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You should have a access valve at the front of your coach . This valve is so the tow driver can activate your air brakes if towed . Put a female air fitting there and 50' of air hose and your good to go .
That's the setup I have, quick disconnect. Also, have the air hose. It may even be factory...
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Old 03-21-2023, 09:09 PM   #12
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Here’s what I did recently under the front hood, well except for it being sideways! LOL
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Old 03-22-2023, 07:15 AM   #13
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You should have a access valve at the front of your coach . This valve is so the tow driver can activate your air brakes if towed . Put a female air fitting there and 50' of air hose and your good to go .
I have a 100í hose, and yes, itís a quality hose that coils neatly and stores hanging on a wall, so I can reach my toad tires which are max 70í away.
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Old 03-23-2023, 12:12 AM   #14
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I have a 100í hose, and yes, itís a quality hose that coils neatly and stores hanging on a wall, so I can reach my toad tires which are max 70í away.

Do all coaches have a place to put a fitting
I look at mine and couldn't find any air line.
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