Petrol gauge for 12/4 Harley

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SeanDixon
Posts: 3
Joined: Mon Feb 22, 2021 10:45 pm
Location: Cornwall

Petrol gauge for 12/4 Harley

Post by SeanDixon » Sat Feb 27, 2021 11:10 pm

Have recently taken over the care of a 1933 12/4 in good condition and as far as I can tell so far, fairly original. It was restored some time in the 1990s, registration FW4278. The petrol gauge is of the capillary type and hasn’t worked for years.
While I’d like to keep her as original as possible, I’m tempted to move to an electrical one of the same Smiths type fitted to the slightly later models.
Would anyone know a supplier or have an appropriate petrol gauge gathering dust that they don’t mind parting with? I’ve been watching eBay but no luck so far.
Could potentially restore the original gauge once it’s out but it grates to have anything not working at all.
I have joined the ATDC but can’t yet see the members forums. Thanks for you help. Sean

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peter_winney
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Joined: Wed Nov 20, 2019 3:31 pm
Location: BATH

Re: Petrol gauge for 12/4 Harley

Post by peter_winney » Sun Feb 28, 2021 10:42 am

Sean
It would need more than just an electric gauge. You would also need a sender unit in the fuel tank. Maybe even a new fuel tank too to take it - Austin changed the design of the fuel tanks on their cars when they changed over from Hobson telegage to electric fuel gauge. The drain plug and fuel outlet had to me moved to make space for the float to swing on its arm.

An effective electronic solution retaining your old gauge and fuel tank is offered by MP Ltd - 01202 625242. The sender unit float slides up and down instead of swinging.

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https://www.youtube.com/watch?v=GWyb3VMGuz4

Peter W

PS - I have nothing to do with this Co. but they do appear to be enthusiasts

PPS - It works better than the traditional notched offcut of broomstick handle
Member since July 1972

SeanDixon
Posts: 3
Joined: Mon Feb 22, 2021 10:45 pm
Location: Cornwall

Re: Petrol gauge for 12/4 Harley

Post by SeanDixon » Sun Feb 28, 2021 9:59 pm

Thanks Peter that’s really helpful.
On balance I’d still rather have a gauge and I’m pretty happy sorting out a sender for it but it’s good to know that’s available as a fallback. Hopefully someone will have one.

Rod
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Joined: Sun Nov 24, 2019 9:44 am

Re: Petrol gauge for 12/4 Harley

Post by Rod » Mon Mar 01, 2021 7:16 am

I thought there were some reconditioning notes for the Hobson gauges in the club technical bulletins if you're keen to have a go at restoring the original system Sean? I know the red fluid is unobtainium [and toxic] but iirc a couple of alternatives were suggested...

SeanDixon
Posts: 3
Joined: Mon Feb 22, 2021 10:45 pm
Location: Cornwall

Re: Petrol gauge for 12/4 Harley

Post by SeanDixon » Mon Mar 01, 2021 9:29 pm

Thanks Rod. I’ve found Tech sheet 5 which covers the fuel gauge and sender and is very helpful. The take home message seems to be to service the sender, replace the capillary tubing and send the gauge away for refurbishment. I was thinking of the electrical gauge/ sender as I can sort that out myself but maybe I should go all out for originality.

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