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Hif44 Su Jet Stuck + Fuel Leak. Advice To Remove+Replace?

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#1 Harwoods

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Posted 12 May 2020 - 11:38 AM

Hi all,

1. Just tried turning our mini over and discovered the fuel had all leaked out onto the manifold overnight, not sure how this can be possible but the temporary fuel tank I have on the front wing (Our tank is rotten) is higher than the tank usually is. Could someone explain a reason for fuel leaking out the carb. The bottom cover for the carb fuel is sealed fine with a new rubber gasket recently. Any other ideas would be appreciated. Especially whilst I have the carb in pieces. 

2. Another issue is that while rebuilding+cleaning the carb the adjustment screw is not able to change the jet height, upon researching this it appears the jet is stuck, I have tried tapping it from the top with a screwdriver and some elbow grease but it's not budging. Any ideas?

Plus the L shaped tube for fuel draw has now snapped because of the strain from being pulled by adjustment screw and bracket. Just some info for others to check if your jet is stuck and you've been trying to adjust it, the plastic can snap just under the tab because of the pressure the adjustment plate applies upwards causes the plastic to be strained sideways if the jet is seized. 

Any help or advice is much appreciated. Thanks a bunch.

- Harwoods

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#2 unburntfuelinthemorning

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Posted 12 May 2020 - 12:32 PM

As you have the temporary tank higher than the carb, fuel is probably coming out of the float chamber vent - if this has no hose attached to it then the fuel will end up on the manifolds.



#3 Harwoods

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Posted 12 May 2020 - 01:51 PM

As you have the temporary tank higher than the carb, fuel is probably coming out of the float chamber vent - if this has no hose attached to it then the fuel will end up on the manifolds.

It is leaking out onto the manifold directly below, I doubt out of the overflow, So are you saying the pressure of the fuel is enough to push past the float+float needle? Thanks for the reply.



#4 gazza82

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Posted 12 May 2020 - 05:26 PM

Been reading up on these over the past 2 days as I'm rebuilding one ... and I was stuck on how that end connected to the bi-metallic strip ...

The jet tube gets stuck probably due to corrosion. Or is it that b*****y ethanol??

The site I was following showed the guy having to be a bit brutal with pliers to pull it out - he was replacing it anyway. As yours is now cracked and needs replacing that may be your option .. have a look at classicmini.weebly.com

#5 unburntfuelinthemorning

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Posted 12 May 2020 - 09:38 PM

 

As you have the temporary tank higher than the carb, fuel is probably coming out of the float chamber vent - if this has no hose attached to it then the fuel will end up on the manifolds.

It is leaking out onto the manifold directly below, I doubt out of the overflow, So are you saying the pressure of the fuel is enough to push past the float+float needle? Thanks for the reply.

 

Not normally but it if the needle valve is worn or stuck open it will.







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