Series 3 Curious non-start problem

I had a fuel tank leak and for the first time decided to do the work myself and replaced it for new. Rusted bolts a bit of a nightmare but in the end - success! However..... here's the problem.... it fires fine while the starter motor is engaged but then stops immediately it's released. Obviously a fuel problem but were to start - pump? Filters? Carb? Fuel line? Advice appreciated!

Have you used the lift pump to refill the line from tank to carb ? Disconnect at carb and pump by hand until fuel comes out.

Have a look in this it has a nice procedure when things go wrong about page 100
http://www.retroanaconda.com/landrover/manuals/2a_owners_manual.pdf
Can you rig up a gravity fuel feed to rule fuel supply it in or out

Thanks for your replies! Yes I have disconnected the fuel pipe from the carb and used the lift pump until fuel comes through. Strangely the engine is actually firing normally but only so long as the starter motor is engaged. The moment I let go of the key it stops.
Re the manual - thanks very much for the link, very helpful. There's a checklist on pp 104-6 that I will follow at the weekend. Gravity fuel feed isn't something I know about but will look into it - any tips welcome!

thanks again - further input on this welcome any time!

Mines diesel so don’t know much about the petrols, does the coil have 12v when ignition on or just when the starter engaged. Can you rig up multimeter to see.
There is a fuel solenoid on carb that needs 12v supply to run
See pages 17-2 and 17-9 on workshop manual
http://www.retroanaconda.com/landrover/2010/03/series-iii-workshop-manual/

Maybe the ignition switch is failing. Mine did this when I first had it, the contacts inside the switch go bad.

Col

Like this one

https://www.landyzone.co.uk/land-rover/fails-to-stay-started.379144/

Colthebrummie said:

Maybe the ignition switch is failing. Mine did this when I first had it, the contacts inside the switch go bad.

Col

Click to expand...

Many thanks for your suggestion. Yes that's possible - at first I was sure it must be fuel, but on second thoughts while the starter motor is on it sounds fine, so it's maybe more likely something like this. Will investigate

steve2286w said:

Mines diesel so don’t know much about the petrols, does the coil have 12v when ignition on or just when the starter engaged. Can you rig up multimeter to see.
There is a fuel solenoid on carb that needs 12v supply to run
See pages 17-2 and 17-9 on workshop manual
http://www.retroanaconda.com/landrover/2010/03/series-iii-workshop-manual/

Click to expand...

Many thanks - am thinking it's more likely electrical now and will investigate this and the ignition switch

See if you have voltage at the coil with ignition on.