Petrol hose bore, pump to carb

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Edward1949
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Petrol hose bore, pump to carb

Postby Edward1949 » Fri Mar 15, 2019 4:00 pm

Different sources state 5mm and 6mm internal diameter. Anyone know for sure?

KeithL
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Re: Petrol hose bore, pump to carb

Postby KeithL » Fri Mar 15, 2019 4:30 pm

I asked SU this question when I was recently looking for an ethanol-proof replacement fuel hose and they said it was 6 mm / 0.25 inch.


philthehill
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Re: Petrol hose bore, pump to carb

Postby philthehill » Fri Mar 15, 2019 4:38 pm

The fuel pump outlet stub is 7mm O.D so a 6mm pipe will fit but of course the fuel pipes are imperial so should be 1/4" I.D...………..

As stated above must be ethanal proof.


mogbob
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Re: Petrol hose bore, pump to carb

Postby mogbob » Fri Mar 15, 2019 5:01 pm

I've just got a micrometer out and measured the outlet stub on my refurbished Petrol Pump down in the shed.It measured , just the merest fraction under 6 mm.
Bob

philthehill
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Re: Petrol hose bore, pump to carb

Postby philthehill » Fri Mar 15, 2019 6:52 pm

The fuel pump (non threaded) outlet stub (Pt No: AUA1424 (MOSS)) fitted to a SU Minor fuel pump is of 7 mm O.D. (9/32")

I have physically checked the O.D. and it is indeed 7.mm (9/32").

The metal fuel pipe to the fuel pump is 1/4" O.D. (6.4mm) again physically checked against a Morris Minor fuel pipe.


Edward1949
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Re: Petrol hose bore, pump to carb

Postby Edward1949 » Mon Mar 18, 2019 11:02 am

Many thanks for the advice, have ordered 6mm and hoping for sufficient tolerance!
Supplementary fuel question : I need a new float needle valve (1968 Saloon, HS2 Carb ) and am a bit baffled by this ebay advert for an HS2 valve which excludes the Morris 1000 from the list of compatible vehicles. https://www.ebay.co.uk/itm/Genuine-SU-C ... SwvRpaq4Ne

Have they got it wrong?

philthehill
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Re: Petrol hose bore, pump to carb

Postby philthehill » Mon Mar 18, 2019 1:57 pm

The float valve in the 'e' bay link should fit but to alleviate any doubt Burlen Fuels is the place to go. They are the successors of SU and will hold all the parts required.

Attached to the carb is a numbered tag which will give the specific carb fitted to your vehicle.

AUD13 is most likely the carb fitted to your Minor and here is the link:-

http://sucarb.co.uk/carbspec/carburetto ... s/id/1907/

http://sucarb.co.uk/float-chambers-spar ... oaded.html

You will need the special spanner or similar to remove and fit the float valve.

http://sucarb.co.uk/tools-flow-meters/t ... anner.html


Edward1949
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Re: Petrol hose bore, pump to carb

Postby Edward1949 » Mon Mar 18, 2019 3:38 pm

philthehill wrote:
Mon Mar 18, 2019 1:57 pm
You will need the special spanner or similar to remove and fit the float valve.


Is this vital, or can I improvise?

philthehill
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Re: Petrol hose bore, pump to carb

Postby philthehill » Mon Mar 18, 2019 4:34 pm

There is very little clearance between the needle seat body and the lid of the float chamber. The special box spanner has a reduced thickness lower end to allow it to fit between the needle seat body and the lid of the float chamber.
You could improvise with a correct size box spanner with the corners taken off.
If I could find my SU spanner (it seems to have gone walkabout) I could give you the dimensions but you should be able to work it out for yourself.

Phil


philthehill
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Re: Petrol hose bore, pump to carb

Postby philthehill » Wed Mar 20, 2019 9:50 am

I have found the special SU float needle seat body box spanner and the measurements are as follows:-

Inside between flats...…………………..,,,,,,,,,,,,,,,,,,,...............………..9.3 mm (3/8").

Outside of the box spanner is reduced to...………............…………...10.1 mm diameter

The length of the reduction from the bottom of the spanner is......19 mm.

You should be able to reduce a 1/4" or 3/8" drive deep 3/8" A/F socket sufficiently to enable you to remove the float needle seat body.

There is always an up side to everything - Whilst searching for the SU Spanner I found a NOS set of cam followers I did not know I had. :D :D


Edward1949
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Re: Petrol hose bore, pump to carb

Postby Edward1949 » Mon Mar 25, 2019 6:34 pm

Update : an old 11/32 socket from a cheap'n nasty 1/4 drive set fitted perfectly without any slimming down . Job done, thanks.


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