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Su Hs2 Leaking Petrol Only At Start Up

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#1 rocoloco

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Posted 15 July 2020 - 09:56 AM

Hi, I am a newbie, I got my Innocenti Mini Cooper 1300 5 days ago (in tip top shape) and I already managed to flood the engine by applying too much gas with choke after firing it up and cranking it a little bit too much.

 

After 2 minutes it started nicely without choke but leaked fuel from overflow vent. Then i drove it for 20 minutes and it was great, no leak anymore.

 

The next day it started fine but again leaked fuel at the beginning after start up and struggled a bit to keep idling nicely even after applying some gas. Then after 3 minuts of drive it was ok.

 

Could this be stuck float or needle which was caused by flooding?

 

Thank you!

 

Rok


Edited by rocoloco, 15 July 2020 - 10:55 AM.


#2 slidehammer

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Posted 15 July 2020 - 11:37 AM

I would say the float or needle valve are sticking or the float is set at the wrong height. Probable stops leaking once the engine is running faster as it requires more fuel to run.



#3 nicklouse

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Posted 15 July 2020 - 11:40 AM

Fix it before it catches fire. As above float and/or needle issues.



#4 rocoloco

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Posted 15 July 2020 - 11:48 AM

thank you, will open the chamber lid and check.



#5 rocoloco

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Posted 10 October 2020 - 06:52 PM

Hi, so now on my twin hs2 carb only one float bowl is leaking through the overflow vent.

I have installed new float chamber lids with new floats, seats and needles on both. I have also added inline fuel filter.

Now one float bowl isn't leaking anymore, but one is still leaking a little bit.

Both floats are the same height.

What could it be? ?

#6 floormanager

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Posted 10 October 2020 - 07:40 PM

Check for dirt or a bit of rubber from your hoses in the needle valve.  You need to remove the float pin and left the needle out and give it a blow out

Paul



#7 rocoloco

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Posted 11 October 2020 - 01:44 PM

I will try. It really got me puzzled.

#8 Maccmike8

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Posted 11 October 2020 - 02:29 PM

Also check the choke isnt sticking. Push the cable in then under the carb try and push the choke body/main jet up.



#9 Ethel

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Posted 11 October 2020 - 02:51 PM

What fuel pump are you using?



#10 rocoloco

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Posted 12 October 2020 - 09:52 AM

Choke isnt sticking, the pump is correct, auf214,its been on a car for a very long time.

Today I will check for debris in the needle valve.

Thank you.

#11 Moke Spider

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Posted 12 October 2020 - 07:32 PM

As what Ethal is getting at here, also check your Fuel Pressure where the hose comes on to the Carbs. It needs to be between 1.5 and 3.5 PSI. If this gets up around 5 PSI, the carbs usually are over come and leak from the vent.



#12 rocoloco

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Posted 03 November 2020 - 07:51 PM

I put on the old float chamber lid set with old needle and float, no more leak.

So one of the two new lid sets was faulty.

cheers
Rok

#13 richmondclassicsnorthwales

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Posted 03 November 2020 - 09:14 PM

S H one T  in the valve / inlet /spasmatic / it happens,/  buy a filter and fit it in, I like close to the carbs, but some say at the back by the tank.

 

Nothing worse than lying on your back in the damp and wet, getting cold and damp and pi*s wet through, than having it up front - my choice



#14 rocoloco

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Posted 04 November 2020 - 10:42 AM

I have it, next to the carbs...







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