Tilley Project 2: Testing Camper Holding Tanks


Over the next several months we will be working to restore and remodel Tilley, our 1976 Silver Streak. Before we can tackle what Kristin calls the “fun” projects–painting and decorating–we need to ensure that her primary systems are solid. The first order of business was to repair the roof and any other areas where leaks might rain on our parade. The next assignment was to test the camper holding tanks to check for leaks or other surprises sometimes inherent in vintage travel trailers.

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Because the Silver Streak has an enclosed underbelly, it is a bit challenging checking for tank leaks. Although we did not see any indicators of long-term problems, we felt it was best to make sure those systems were solid before moving forward with the rest of the remodel.

The goal for this test was first to make sure that the holding tanks had no large or small leaks, but it was also to determine how big the holding tanks were. We had heard from other Silver Streak owners that the tanks were likely around 22 gallons each.

One of my strategies for testing the camper holding tanks was to add different food coloring to the kitchen sink, bathroom sink/shower, and toilet. I was hoping the food coloring would help me visually see any underneath leaks (should they be present), as well as confirm that the sinks and shower were all running to the grey tank.

I also kept track of how much water I poured down the toilet and sinks/shower drains. I wanted to fill them up as much as possible to check for any leaks. Thankfully the tank indicators still work, so I knew when to stop adding water. Then I let all that water sit for awhile. If the same amount of water that I put into the tanks later came out, it should be a safe bet that the tanks are not leaking. I explain more in the video below:

I later solved the mystery of the missing 1.5 gallons of water: I must have miscounted because after I repeated the test, I had the same amount of water coming out that I had put in. That was a relief–because having to replace one of the tanks would have been costly.

But now that we have confirmed that our holding tanks are not as large as we hoped, we are trying to make a final decision on whether to go with a composting toilet so that we can use the black tank as a secondary grey tank. Our current camper has 30 gallon holding tanks, and as a family of five we can only go about 3-4 days before we have maxed out the grey tank. And that’s with either no showering, or army showers. So going to a smaller tank means we’d probably only last 2-3 days. That’s definitely not ideal if we want to do any boondocking.

Although a composting toilet is expensive, having larger tanks added to the camper would probably be comparable in price (this isn’t something I feel capable of doing, so there would be the additional labor fee). And we’re not even sure we’d be able to add bigger holding tanks since there might not be adequate room underneath. The composting toilet would be an adjustment initially, but the long-term benefits probably make it the most logical solution, especially since we are hoping to be able to do some boondocking in the future. Decisions, decisions. We’ll keep you posted though!


2 thoughts on “Tilley Project 2: Testing Camper Holding Tanks

  1. Gretchen

    I’ll be very interested to hear how you like it if you end up with a composting toilet! Every once in awhile I start researching something like that or getting a big solar setup…and then always conclude that we don’t boondock enough to justify the expense. But maybe someday! The relatively big tanks on the toy hauler were definitely one of its selling points in the meantime.

    1. Kristin

      They are definitely expensive, but since either option we have would be expensive it makes it a bit easier to swallow. 😉 Our kids are quite skeptical right now about the whole idea–so it shall be interesting. 🙂

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