SU fuel pump mark 1

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snowsports1

SU fuel pump mark 1

Post by snowsports1 »

hi can someone either describe or provide a picture of the mark 1 moke fuel pump installation, I am returning my moke to original spec after some "modifications" by others! thanks
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi, will this help?
Image
The pump is held in a circular clamp which is then bolted to the top plate of the left pannier.
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Chris
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Re: SU fuel pump mark 1

Post by pbraun »

The top? Could you show me a photo? Just doing this job now....no holes in top of pannier box, but the bracket seems to want there, except for sliding pants over bolts each time getting in.
peter
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi Peter,
This what you are after? Front of the Moke is to the left
Image
Front fixing hole for the pump is approx. 95mm inboard of the fixings for the hand hold (and 65mm from the inner edge of the side pod) and is 65mm behind the front fixing for the hand hold.
Does this help?
Cheers
Chris
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Re: SU fuel pump mark 1

Post by pbraun »

Yes, Chris, that does help. However, mine is RHD, so there is no hand grab handle on that side.

I will just locate the mounting holes close to where it looks like they want to be. Actually, I was really looking for a photo similar to the workbook drawing, with the side cover off, looking in at that darn fuel pump, and all the fittings.

Are there two metal lines after the pump? I know there is a short petroflex line, then a twisty metal line, and perhaps then the long petroflex line, but I am not sure on that. ........

Now I have to refurbish the tank, a task I have been putting off, but I now don't think it will be too bad, just time consuming.
peter
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi Peter,
Will see what I can do re a photo from inside tomorrow.
Cheers
Chris
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Re: SU fuel pump mark 1

Post by pbraun »

Thanks! , ,,,, or maybe tanks! ;)
peter
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi Peter,
This what you were after?
Image
Chris
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Re: SU fuel pump mark 1

Post by pbraun »

Yes, you are very helpful! I do appreciate your efforts! Thanks again.
As a follow-up, the fuel lines forward of the pump - first, a short flex line, then a metal....does that metal line carry on through the pannier side and firewall? Then flex to carb?

Thanks again!
peter
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi Peter,
From the pump, the copper pipe goes uder the front wing,
Image
Then into the Moke interior,
Image
Then through the bulkhead into the engine bay, then flex to the carb.
Image
Cheers
Chris
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Re: SU fuel pump mark 1

Post by pbraun »

Hi, Chris,

Oh! Well that's pretty easy! I may be able to make that more complicated! Thanks again good photos!

Best,
peter
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spider
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Re: SU fuel pump mark 1

Post by spider »

Wally2 wrote: Image
Chris
Sorry for going OT here.

Chris, is that a fuel filter in the inlet side of the Pump?

While it may seem a good idea, it's actually not wise. When the filter blocks up, it will actually allow the pump to stall in an energised state and in doing so, will burn it out, it is also the common cause of the points burning out (in the non electronic models).

OK, sorry for that, resume topic :)
Old Mokers never die, they just smell that way.
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Wally2
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Re: SU fuel pump mark 1

Post by Wally2 »

Hi Spider,
Thanks for the advice, I hadn't noticed it before Peter asked for a photo of the pump! If the filter is on the delivery side of the pump i.e. just before the carb where I have seen them on other Mokes, would it not have the same effect if it blocked up? Perhaps I ought to change mine to this location.
Cheers
Chris
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Re: SU fuel pump mark 1

Post by Doug G »

I changed my Mini Moke's fuel pump for an electrical one.
Having a moking good time!
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spider
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Re: SU fuel pump mark 1

Post by spider »

Wally2 wrote:Hi Spider,
Thanks for the advice, I hadn't noticed it before Peter asked for a photo of the pump! If the filter is on the delivery side of the pump i.e. just before the carb where I have seen them on other Mokes, would it not have the same effect if it blocked up? Perhaps I ought to change mine to this location.
Cheers
Chris
Hi Chris,

No, it doesn't have the same effect. Think about how the float bowl / needle and seat works. The fuel flow is reduced and shut off at times. That's normal operation. Putting the filter in here, has the same effect from the pump's view. It just builds up pressure, which is what shuts off the pump and then waits for a pressure drop before starting to pump again.

If the inlet of the pump gets blocked up, when the pressure on the outlet drops, which could be because there's no fuel flowing through the pump, the pump will try to suck and push more fuel through. If it does get some but not a full load of fuel, the pump won't reach full stroke (hydraulic lock) and so won't trip the points to turn it off, leading to a burn out in fairly short order.

On mechanical pumps, this isn't an issue, there's nothing to burn out, but not so on SU electric ones (and I think most others).
Old Mokers never die, they just smell that way.
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