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Mechanical Fuel Pump Replacement


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#1 JimW1991Neon

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Posted 11 August 2019 - 12:53 PM

I’m trying to change the mechanical fuel pump, but have run into a wall!
I’ve removed the carb, the inlet manifold, and the tappet cover and breather, but I cannot find any way to get a spanner or socket on to the fixing nuts of the fuel pump itself.
I’m now completely stuck!
Is there any Good Samaritan out there, in the Peterborough area, who would be prepared to come over and help me out of this jam? Please?

#2 unburntfuelinthemorning

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Posted 11 August 2019 - 01:09 PM

Ah man I would have done when I lived there a few years ago.

 

Are you trying to use half inch drive sockets?  Three eighths drive sockets are more useful. 

 

Not the easiest job on a Mini.  I can't picture it at the moment as the engine's out on mine. 

 

Cutting an old spanner down might help too.



#3 DeadSquare

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Posted 11 August 2019 - 01:21 PM

Probably a silly question, seeing as you have managed to remover the inlet manifold, but are you using imperial, not metric spanners ?

 

Almost all my Minis had/have electric pumps, but I remember when doing a mechanical one, removing the exhaust manifold and using a 1/4" drive ratchet, universal joint and 1/2" socket, with someone underneath, holding it in place.

 

If I weren't in Hereford, I'd come over with my tools.



#4 luismx123

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Posted 11 August 2019 - 01:43 PM

at the op, let us know if you manage. Im about to tackle this too so ill be following your advice ;) good luck!



#5 Chris1275gt

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Posted 11 August 2019 - 02:48 PM

Just changed the mechanical pump with a 1/4 drive socket set, socket fits on the nut easily and with a bit of patience you'll get there.

#6 JimW1991Neon

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Posted 11 August 2019 - 04:28 PM

Chris, what size socket did you use?
I can’t get a clear enough view to see what size I need!

#7 Rorf

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Posted 11 August 2019 - 05:02 PM

Its a 1/2 inch nut, and a 3/8 socket drive is the way to go.



#8 JimW1991Neon

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Posted 11 August 2019 - 06:51 PM

Thank you, Rorf

#9 cal844

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Posted 11 August 2019 - 07:10 PM

Use 3/8 drive 1/2 inch socket.

Use some silicone or RTV sealer on the pump gaskets to stop them leaking oil

#10 unburntfuelinthemorning

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Posted 11 August 2019 - 07:26 PM

You may struggle with a 1/2" socket.  Up to A+ the pumps were held on by studs with 1/2" AF nuts.  From A+ onwards instead of studs and nuts, they were held on by bolts with a head size of 7/16" AF.

 

As yours is a 1991 model try a 7/16" socket.



#11 JimW1991Neon

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Posted 12 August 2019 - 09:50 AM

Thanks, Unburnt.

 

I'm going to give it another try this weekend. Determined to get this darned pump off and replaced!






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