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Need Some Help Car Cuts Out.


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#1 JCmini

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Posted 14 September 2018 - 06:11 PM

Went to start car today. Started it with choke. Drove it straight away out of drive then it cut out.
I went to start it again and it did start. After about 20 secs the revs went up slightly and then the car died.Then I noticed loads of fuel leaking out of the overflow by carburettor.

Any ideas?

#2 DeanP

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Posted 14 September 2018 - 06:28 PM

Could be blockage somewhere, fuel getting pumped but not enough getting to the engine and the rest being dispensed with.

 

Have you ran the tank empty recently? Could have pulled some rubbish up from the tank.



#3 JCmini

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Posted 14 September 2018 - 06:58 PM

It's got half tank fuel. Cant think where blockage could be.

#4 smurfomatic

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Posted 14 September 2018 - 07:11 PM

When you say it's leaking from the overflow by the carb, is it from the carb itself or the float chamber? Might be a stuck needle valve if it's coming out of the float chamber.



#5 cal844

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Posted 14 September 2018 - 07:25 PM

If it's out the float chamber overflow do you have it piped away from the exhaust?

If it's the overflow your best to remove the bowl lid and strip and inspect for wear and debris.

Fit an online fuel filter

#6 DeanP

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Posted 14 September 2018 - 07:42 PM

 

 

Worth a watch if you haven't taken a float chamber apart before.



#7 JCmini

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Posted 14 September 2018 - 07:46 PM

Cheers guys. I took the lid off. Seems ok. I adjusted the mixture to a little richer and that seems to solve the problems.
And yeah leaking out of float chamber.

Edited by JCmini, 14 September 2018 - 07:52 PM.


#8 cal844

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Posted 14 September 2018 - 07:48 PM

Cheers guys. I took the lid off. Seems ok. I adjusted the mixture to a little richer and that seems to solve the problems.


Did you strip the lid to check the float valve for debris and wear?

#9 DeanP

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Posted 14 September 2018 - 08:01 PM

Sounds like the float isn't doing it's job, the lid mechanism is either worn or as previous posters mention, you have trapped dirt. Imagine a toilet cistern, it works on pretty much the same principle, keep the float pushed down... your cistern overflows.



#10 JCmini

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Posted 14 September 2018 - 08:14 PM

I will have to take it apart tomorrow to check. What's the point of overflow anyway. I've seen some lids with just the one pipe for fuel and no second pipe for over flow. Could I just change it for one of them?

#11 Bat

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Posted 15 September 2018 - 12:51 PM

Hi,

They all have an overflow, just some don't have a pipe only a breather hole 

The overflow is to stop the float chamber pressurising.

The fuel level in the float chamber has to remain constant at all times to keep the mixture correct. If the level is too high it pushes extra fuel out the main jet into the engine.

Cheers  :proud:



#12 timmy850

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Posted 16 September 2018 - 09:40 PM

As mentioned above, you definitely don’t want fuel overflowing onto the hot exhaust manifold. If you don’t have one already, a short length of hose to direct the fuel overflow away from the engine is a good idea.

#13 JCmini

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Posted 17 September 2018 - 07:07 AM

thanks for response. Yeah the overflow goes into a rubber hose which then goes into a metal pipe which contours around the gear box and down the front of the sub frame. So far not had any issues since making the mixture richer. 

 

you can see in the picture the pipe that goes away. 

 

LK6Xm53l.jpg


Edited by JCmini, 17 September 2018 - 07:23 AM.


#14 JCmini

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Posted 17 September 2018 - 04:08 PM

UPDATE. 

 

So took the float lid apart.  

Float seemed all good

Needle seemed good. The pointed bit is made out of rubber which I was not expecting

Then unscrewed the seat/base and turned it upside down and saw a very small black debris. Not sure if that was the obstruction but took it out any way.   you can see in the pic the small black debris in between the needle and base.  

The base did not have any washers so no idea if I need to adjust the float height

PYVY1MIl.jpg


Edited by JCmini, 17 September 2018 - 04:22 PM.


#15 DeanP

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Posted 17 September 2018 - 06:59 PM

I think you have found your problem. The debris would be preventing the needle from shutting off the fuel. Try leaning the fuel back off again to where it was before.






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