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Whats the best fix with out taking the sump off.Ie brazing or is there a putty i can use
regards fatboy

I'd say brazing would do more damage than good, I repaired a fuel tank with a metal putty stuff and it lasted for years, not sure if it would cope with engine heat though. Got it from a auto parts store.

I once used Araldite and newspaper when I had a crack in my sump

Worked a treat

Depending on where it is and how long you intend to leave the sump on before replacing/repairing.....

and..

if it were just a pin-hole....

you may be able to fit a self-tapper with a washer gasket - once threaded into the sump remove it and grind off all excess..... this would be an absolute short term fix - I don't like the thought of doing it - but if were to happen on the road, I carry some for this reason........

I feel that putties and the like are great if you can get them onto a very clean surface - unfortunately, sumps carry oil and by its very nature is designed to lubricate and coat........ which it does very well.....

Not a good solution - but one which may get you to the point of making better the repair.......

Just be careful the hole is not surrounded by rust - probably from the inside - a self-tapper would only add to the problem.......

frats,
Rosco

I always braze or weld sumps that need repair but that is always with sump off engine.

If your sump is in situ as you said I'd probably follow part of rosco's advice and screw a short/stubby self tapper into the hole ( without a washer/gasket though ) and then braze the self tapper head to the sump and grind down the braze blob so it looks OK.
Make sure the area around the part to be brazed has been cleaned/ground to bright metal and is oil free.Braze won't meld to rust,paint or oil.

If I was out in the middle of woop woop with no tools/welding available I'd use a metal repair putty or similar.