S.U Part No 4080 Petrol pump leak petrol

[Sandun]

Hi the pump leak petrol when it work- i put a merror under the pump then start the car , i see petrol come out the small hole that close by the filter nut - what is the problem -

[panky]

Is it a tell-tale hole to show that the diaphragm is leaking.

[Sandun]

is it damage ?

[panky]

If it is the diaphragm tell tale then yes it will be split. But wait until someone confirms.

[bmcecosse]

Sounds like it - new diaphragm required...

[TYC601]

I think I read in the manual that for 'warmer climates' it prevents build-up of condensate in the housing although I guess if there is petrol draining through it then the diaphragm is leaking badly! I recently had a diaphragm fail with only a pinhole in the fuel side membrane and it wouldn't pump any fuel, buzzing away merrily. No fuel got past the second membrane.

[Sandun]

my pump work fine yet - only leak fule in the hole - and can u tell me how to new diaphragm change

[Trickydicky]

Here is a guide to disassembling the pump,
http://www.mg-tabc.org/library/fuel_pump/supump2.html
You may need to source a spare diaphragm first before disassembling your pump.
Hope it helps.

[Sandun]

Thank u - big problem is diphragm not in Sri Lanka