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Old 06-06-2023, 11:09 AM   #1
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2022 Sanibel 3902WB dumping 2nd black tank

Hi there

I just recently got a 2022 Sanibel 3902WB. It is my first RV.

Today I had the black water holding tank pumped out (service in park). After the pump out, Black Tank 1 shows empty, but Black Tank 2 still shows full.

There are 2 bathrooms.
There appears to only be three levers on the driver's side. waste water, galley (kitchen sink), and grey water holding tank.

is there supposed to be another lever for the 2nd holding tank? is there a switch? would flipping the switch on the control panel, where I check levels, change it from one tank to the other?

The dealership didn't cover any of this on the walkthrough (guy was rushed as they scheduled him late afternoon on the friday of a long weekend)

Any help would be greatly appreciated.
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Old 06-06-2023, 12:35 PM   #2
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Some models with a 2nd bathroom have a 2nd black tank dump port and dump valve near the back or up under by the axles and sometimes reported being on the curb (door) side.

Welcome to the forum, I see it is your 1st post.

It's a shame you got a poor PDI/Customer Orientation but have you called and asked the dealer where it is located?
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Old 06-06-2023, 01:53 PM   #3
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Quote:
Originally Posted by 5picker View Post
Some models with a 2nd bathroom have a 2nd black tank dump port and dump valve near the back or up under by the axles and sometimes reported being on the curb (door) side.

Welcome to the forum, I see it is your 1st post.

It's a shame you got a poor PDI/Customer Orientation but have you called and asked the dealer where it is located?


the guy doing the pumpouts looked as well - neither of us could find a second port or valve

have contacted dealership and the service technician who fixed my GFCI problem last week is trying to figure it out as well, including calling another dealership with the same model - waiting to hear back

have tried calling PrimeTime in Indiana - woman who answered phone tried to help but we got nowhere, took my VIN and passed that along to a tech who started 90 min ago, but I haven't heard anything from them
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Old 06-08-2023, 08:02 PM   #4
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Quote:
Originally Posted by j0hn View Post
Hi there

I just recently got a 2022 Sanibel 3902WB. It is my first RV.

Today I had the black water holding tank pumped out (service in park). After the pump out, Black Tank 1 shows empty, but Black Tank 2 still shows full.

There are 2 bathrooms.
There appears to only be three levers on the driver's side. waste water, galley (kitchen sink), and grey water holding tank.

is there supposed to be another lever for the 2nd holding tank? is there a switch? would flipping the switch on the control panel, where I check levels, change it from one tank to the other?

The dealership didn't cover any of this on the walkthrough (guy was rushed as they scheduled him late afternoon on the friday of a long weekend)

Any help would be greatly appreciated.
Quote:
Originally Posted by 5picker View Post
Some models with a 2nd bathroom have a 2nd black tank dump port and dump valve near the back or up under by the axles and sometimes reported being on the curb (door) side.

Welcome to the forum, I see it is your 1st post.

It's a shame you got a poor PDI/Customer Orientation but have you called and asked the dealer where it is located?
Quote:
Originally Posted by j0hn View Post
the guy doing the pumpouts looked as well - neither of us could find a second port or valve

have contacted dealership and the service technician who fixed my GFCI problem last week is trying to figure it out as well, including calling another dealership with the same model - waiting to hear back

have tried calling PrimeTime in Indiana - woman who answered phone tried to help but we got nowhere, took my VIN and passed that along to a tech who started 90 min ago, but I haven't heard anything from them

Since you don't mention what your panel lights indicated when you first set up camp, we can't tell if they were possibly mis-wired or not hooked up at all.

No. Flipping the switch doesn't do anything except let you know the levels in the tank. With that being said, those indicators/sensors are notorious for being inaccurate. "Stuff" gets stuck to them and give you false readings. Don't worry too much as you'll eventually be able to gauge how long you can go before needing to dump.

By looking at your floorplan and seeing that the toilets are virtually "back to back", I would almost venture to guess that they both dump into 1 black tank. One way to tell for sure is to turn off the water supply (after dumping & flushing), open the toilet bowl valve in the main bathroom (step on pedal) and look down into the tank with the aid of a flashlight. The tank should be empty. Repeat the same in the bunkroom toilet and look again. If it's empty, then you probably only have 1 black tank. If it still has water in it then keep looking for another pull handle.

Primetime used to be very good at answering customer concerns and it looks like it may still be somewhat true. At least you reached someone who passed your concern on to someone else who should find an answer. Hopefully, you'll get a call back. If not soon, call back and ask to be put in contact with the Sanibel plant foreman. You can also use their "contact" option through their web site at https://primetimerv.com/contact-us Wendy Corl should get back to you fairly quickly (I've delt with her before & she responded within a day or 2).

Good luck & keep us informed on the solution.
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Old 09-03-2023, 06:45 PM   #5
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It’s there. You may have to get under the trailer to see it. I had a similar issue although mine was with finding the galley dump valve, not the black tank for the front bathroom.
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