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Pressure issues No2 Modified Stove

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I have just started on servicing my MoD stove collection, I have a No2 Modified stove and after checking all washers etc were shrivelled and bone dry.

After replacing all washers rubbers etc, using a kit form Fettle Box I started reassembling; Pump pressures with finger over end, spring in small brass tube moves and all holes are clear, however the pump does not pressurise once hand tight, if I loosen it slightly the air goes down the thread and escapes, this I feel would allow the diesel into the pump if left.

Any clues would be appreciated, as I have another 5 to service

 

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Stupid question, but does the liquid being pumped aid in the sealing and making of pressure? We have a hand fluid transfer pump for diesel that pumps like crazy and so easy until the fluid reaches a certain point inside then it becomes solid and lots of work to pump fuel, kind of looses its prime is al I can describe it as

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Robin

The way it looks to me is the spring pushes the grommet to seal the pump unless pressure is applied whi h is pushing the grommet away to let air into the tank, grommet may not be the most accurate description 

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