Leaky gas tank?

[John Russell]

We have a large underslung gas tank, factory fitted in 2001. I recently noticed that over four months, the fill level had reduced on the control panel from 20℅ to 10℅ whilst the tank was locked off.

The tank appears externally to be in good shape.

One niggling worry is that when we got the van it had an M10 to dish adaptor which we used on our return journey from Poland.

When we got home we took it to a motorhome repair shop for an MoT and to deal with a few issues.

I asked them what the thread on the adaptor was. For reasons best known to themselves, they fitted a UK filler and a set of adapters to attach to it without discussion. First they said they'd cut a matching thread, and when I asked about the thread, that they'd glued it in.

Whilst this is an awkward bodge, I'm wondering whether their approach might be connected to the apparent leak, and whether it's good practice.

I'd like to get the installation checked out. Gas Safe have a register which includes local engineers, but I'm wondering where to find someone who's used to dealing with motorhomes in the Cambridgeshire-Suffolk-Peterborough area?

And any expert opinions on the setup?

 

[Richard n Ann]

Just spray some soapy water on the suspect joint. See if you've got bubble trouble

 

[HugoBNB]

Hello. 22 years is a long time for a gas tank. I think they have an expected lifespan of 10-15 years.
Hope you get sorted.

 

[L' Hobo]

You can use, initially, a proper gas leak detector that you could spray on any suspect joints (or washing up liquid as I'm sure others will say) that you can buy from most good caravan/M/H accessory shops/dealers.
If you find any leaks, get them fixed by a professional.

Edit: The problem with washing-up liquid is that is salt based and can cause rust unless washed off completely.