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Fuel Pump Choice


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#1 Minigman

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Posted 16 March 2019 - 12:21 PM

I’ve just finished building an uprated 1275GT engine (12H706, so post ‘73 - rod change type). Just wondering what fuel pump to run? The engine is expected to make low 90bhp running on twin HS4s, so should I retain an original mechanical fuel pump or go win an electric one, either boot mounted or subframe mounted? Or is there another better option?

#2 nicklouse

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Posted 16 March 2019 - 12:26 PM

either, take your pick.



#3 Minigman

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Posted 16 March 2019 - 12:34 PM

either, take your pick.


So the mechanical pump is ‘man’ enough to feed the HS4s?

#4 nicklouse

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Posted 16 March 2019 - 12:55 PM

 

either, take your pick.


So the mechanical pump is ‘man’ enough to feed the HS4s?

 

nothing to do with the carbs. the engine dont need more than a mech pump can provide.



#5 Minigman

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Posted 16 March 2019 - 03:36 PM


either, take your pick.

So the mechanical pump is ‘man’ enough to feed the HS4s?
nothing to do with the carbs. the engine dont need more than a mech pump can provide.

So why do people fit an electric pump? I appreciate mk1&2 had them and Early mk3s too I think.

#6 phillrulz

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Posted 16 March 2019 - 03:57 PM

 

 

 

either, take your pick.

So the mechanical pump is ‘man’ enough to feed the HS4s?
nothing to do with the carbs. the engine dont need more than a mech pump can provide.

So why do people fit an electric pump? I appreciate mk1&2 had them and Early mk3s too I think.

 

 

I guess as a failed diaphragm can fill the engine with petrol,  other than that no idea personally. 



#7 Moke Spider

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Posted 16 March 2019 - 05:50 PM

While a mechanical pump will most likely be able to deliver enough fuel, I would go electric.

 

The location of the mechanical pump on these engines, especially when performance exhaust manifold and twin carbs are fitted, is far from ideal.



#8 Cooperman

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Posted 16 March 2019 - 07:05 PM

My personal preference is twin FACET pumps piped in parallel and mounted under the rear seat base panel. Wired separately with a different feed and switching gives best reliability.

#9 nicklouse

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Posted 16 March 2019 - 07:08 PM

 

 

 

either, take your pick.

So the mechanical pump is ‘man’ enough to feed the HS4s?
nothing to do with the carbs. the engine dont need more than a mech pump can provide.

So why do people fit an electric pump? I appreciate mk1&2 had them and Early mk3s too I think.

 

pipe routing. better ability to supply fuel at a controlled pressure. and reliability.



#10 jsor26

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Posted 16 March 2019 - 07:59 PM

I have a Holley pump with adjustable regulator and a pressure gauge.
Never have to guess what’s going on.

#11 Minigman

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Posted 16 March 2019 - 08:06 PM

Sounds as though an electric pump would be the better bet. I’ve run facet pumps before mounted on the rear subframe as they’re annoyingly ‘ticky’ with a pressure regulator adjacent to the carbs. Is facet still the pump of choice?

#12 Cooperman

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Posted 16 March 2019 - 08:15 PM

I always bolt mine under the rear seat base panel inside the rear sub frame inner edges to the lhs of the centre-exit exhaust box. Then I make up a shield plate from 1.5 mm thick aluminium sheet to keep the DGS off of them.

#13 Moke Spider

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Posted 16 March 2019 - 11:40 PM

I've been using the Hardi Pumps ( a German SU Copy) on a number of cars for a while now. Right pressure, so no need for a regulator. I'm really happy with them and they are fairly Priced.

 

Mini Spares have them

 

https://www.minispar...|Back to search



#14 Minigman

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Posted 17 March 2019 - 12:59 PM

I've been using the Hardi Pumps ( a German SU Copy) on a number of cars for a while now. Right pressure, so no need for a regulator. I'm really happy with them and they are fairly Priced.

Mini Spares have them

https://www.minispar...|Back to search


Funnily enough I was looking at them last night. Seem a good option.

#15 Arthy

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Posted 17 March 2019 - 02:44 PM

I've recently switched to an electric Facet 'cube' type myself!

 

Works fine on my modified 1330 with twin HS4's, and adds another layer of security too. Just make sure it's the low pressure one (1.5-4.0 PSI) if you're running it without a regulator.






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