Petrol fumes from THP engine

[notrix]

There is however another twist to this. The pressure accumulator for the lubrication oil has an external hole which allows the position of the diaphragm to be measured, giving an indication of whether the oil chamber has been breached. I have measured this on my faulty pump, and the measurement is 18 mm, which is apparently exactly where it should be. This seems to be a strange coincidence.

How do you measure the diaphragm? I have removed the pump from my DS3 Racing in anticipation of the new pump.

Edit: Mine's at 23mm.. probably a good thing I'm replacing it.

[xantia_v6]

I assume that you have worked it out, but here are some pictures anyway...

[notrix]

Yeah, that's what i figured

Where did you find the spec for it? Do you have any URL's?

[xantia_v6]

I saw a youtube video where a new pump was measured, but I don't have a link. I did not know about this until after I had installed my new pump, so did not measure that. I believe that my old pump is OK, and it now measures 19mm, I think the difference from last time I measured it is probably due to the temperature of the oil (it is only about 3° in my garage this morning).

[notrix]

Allright.. I'll compare the old and the new at the same temperature when I get the new one.

Do you still believe you solved the problem with petrol getting into the sump with replacing the pump? I have the same issue with my DS3 Racing and I have a new pump on the way.

[androa]

On my C4 Grand Picasso II I have a simliar problem as gwest It is worse when the tank is completely full, to the point where it chokes the engine. 3/4 and down is less problematic.

The Citroen garage diagnosed it as a known issue and wanted to change basically the whole EVAP line and gasoline tank. They were very skimpy on details, but I do believe there is a valve inside the gas tank that is supposed to prevent liquid gasoline to spill into the lines that is supposed to take fumes to the charcoal canister of the EVAP.

I believe the issue is that this valve gets stuck in the open position and allows liquid gasoline to reach the canister which then is saturated with gas and injects way to much gasoline into the engine, causing it to run on a way to rich mixture and then causing this smell of soot, gasoline, and exhaust.

The valve can not be reached or replaced without replacing the whole gas tank. And then the rest of the EVAP needs replacing because it is not built for liquid gasoline.

[gwest]

This has a lot in common with my experience of oil dilution in my DS5 THP
https://www.aussiefrogs.com/forum/index ... on.152191/