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Old 10-14-2016, 07:07 AM   #1
1990 34' Excella
Zephyrhills , Florida
Join Date: Apr 2016
Posts: 67
Diaphragm pump leaking

I am new to Airstreams and recently purchased a 1990 Excella. I noticed white mold coming up between the carpet & the closet the other day. After clearing everything out & opening the hatch, i saw water at the base of the pump. The connections seem secure, but it's leaking from somewhere. The pump is a 98, but seems to work fine. Should i try replacing the connections or replace the pump?Click image for larger version

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Old 10-14-2016, 07:51 AM   #2
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1966 22' Safari
Weatherford , Texas
Join Date: Jun 2008
Posts: 1,146
Dry everything off as best you can and try to find out just where the leak is. Connections loosen with vibration during travel, so re-check those. Check the water lines, to the extent possible. Might be a failure or freeze damage there.

You're right that the pump itself is a possibility. They're not expensive (around $100) and not hard to replace.

A mechanic's inspection mirror with a long handle and a flashlight are valuable tools when trying to see into small spaces. Shine the light into the mirror and let it reflect onto the item you're trying to see.

Sounds like you have a very cool trailer.

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Old 10-14-2016, 07:54 AM   #3
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1991 34' Excella
Princeton , New Jersey
Join Date: Aug 2003
Posts: 6,312
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if you can wait till things dry out or dry them with a heater or hair drier I would place a brown paper towel under the pump and turn it on just long enough to pressurize the system. If the leak is from the pump or the connection near it the towel will show it. You will have to unbolt the pump mounting to get the towel under it.

It looks like the plastic is still on top of the rug so the this test should not see water that is under the plastic, which will take months to dry if left under there.

You may want to poke around in the area and through the plastic with an ice pick to test the subflooring.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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