Rear waste water tank level sensor replacement ?

[bigalw35]

Hi, I’ve got 2001 Mercedes Hymer B680, I’ve washed/flushed out the waste tank so many times but the level indicator generally reads full, even when I KNOW it’s empty, I assume the level sensor is kaput, but I can’t see where it is, or even a plate/trap to gain access to it, any ideas be greatly appreciated, TIA incidentally it has a rear transvers bed over the garage

 

[Guigsy]

They are really unreliable. Ours is only a couple of years old and already gets stuck at 25%. Someone needs to invent a sensor that can survive grey water.

 

[Two on Tour]

They are really unreliable. Ours is only a couple of years old and already gets stuck at 25%. Someone needs to invent a sensor that can survive grey water.

If it's an underslung tank or have access to the underside of the tank then the Mopeka Tank Pro bluetooth/ultrasonic sensors work treat.

 

[Andy1954]

We had a Hymer B774 for 8 years, at least once a year I needed to remove the water tank lid and clean the probes. I used a kitchen scourer the ones that are foam with a green rough side. Use the rough side. That always cured ours …. For a while

 

[barny]

I agree with Andy1954, in that our Swift has a cap underneath and I slide under, remove the cap and do the same once in a while to keep the probes free from gunk.

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[SIFTA SAM]

I found the main fault on the Hymer type was the poor electrical/mechanical connections between the top of each stainless steel probe and its signal output wire. The connections just rely on the large blob of potting compound to hold the joints together, which it does initially.

 

[TCG]

the probe may be scaled up give the tank a good soaking with this... always works for me

 

[Lenny HB]

Normally with Hymers it is mounted in the top of the tank as they use the probe type. Normally fairly closed to the inspection hatch.

 

[bigalw35]

Normally with Hymers it is mounted in the top of the tank as they use the probe type. Normally fairly closed to the inspection hatch.

Many thanks Lenny HB, the motorhome (Hymer B680) is a 2001 model, so I’m just looking at replacing the sender, but I don’t know where to look for it ?, any help would be appreciated

 

[Stealaway]

Many thanks Lenny HB, the motorhome (Hymer B680) is a 2001 model, so I’m just looking at replacing the sender, but I don’t know where to look for it ?, any help would be appreciated

Do you really need to know what level it's at.
Simply empty it when your water tank is getting empty or a soon as convenient.
A brand new one won't last very long either.

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[U.Toadifact]

The level indicator on our Swift PVC worked briefly when we first bought it, then it stuck on half full for over eighteen months until yesterday, after coming home in torrential rain, it is now stuck on full. How is it we can smash an object into a relatively small rock in space but cannot design a decent water level indicator?