How to add DPF cleaner to Peugeot Partner Van fuel tank

[gasbusters]

I own a 2014 Peugeot partner van.

My DPF filter at risk of blocking/clogging warning came on recently, so I took it for a 1 hour drive on motorway, doing 3000rpm in 4th gear. The fault disapeared.

3 weeks later fault came in again so took it for another long drive. Fault cleared.

But this time I decided to buy some JLM DPF filter cleaner.

I tried putting it into the fuel tank but the metal round section behind the fuel cap that goes "inwards" when you put fuel in won't go in when I try pressing it open with anything else. With the fuel gun nozzle at petrol stations it goes in no problem. But with anything else, it won't open. Tried copper pipe, plastic pipe etc. No luck.

Is there any way specific way to get that cap open to put the DPF cleaner into the fuel tank?

 

[carmanmemoranda]

Won't work, save your time and money.

Been a very recent thread on this very subject

 

[Harry Bloomfield]

I tried putting it into the fuel tank but the metal round section behind the fuel cap that goes "inwards" when you put fuel in won't go in when I try pressing it open with anything else. With the fuel gun nozzle at petrol stations it goes in no problem. But with anything else, it won't open. Tried copper pipe, plastic pipe etc. No luck.

A bit vague, but I think I remember something along the lines of, the filler being interlocked, to prevent the wrong fuel being put in. The nozzles ID themselves to open the filler

 

[Avocet]

Doesn't that vehicle use Eolys? If so, is the Eolys tank empty?