Jump to content


Photo
- - - - -

Mechanical Or Electric Fuel Pump?


  • Please log in to reply
8 replies to this topic

#1 Adam Johnson

Adam Johnson

    On The Road

  • Noobies
  • PipPip
  • 48 posts
  • Location: Southampton

Posted 21 October 2020 - 09:03 PM

I have a newly built engine by Ian at Avonbar. I am running twin HS4s on it. The engine is 1330 and should reasonably quick (for a mini). Before I put the engine back in, would I need to replace the mechanical fuel pump with an electrical type. Will there be enough fuel from the SU pump?  If not, what would people recommend?



#2 cal844

cal844

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 7,988 posts
  • Location: Ballingry, Fife
  • Local Club: TFMOC

Posted 21 October 2020 - 09:06 PM

The mechanical pump should suffice, someone will be along soon to give more sound information, if you feel that you need an electric pump use a low noise facet pump set to 3psi.

I will suggest you wire in a low oil pressure cut off to the fuel pump live feed for safety.

Regards and apologies I can't be of more help

Cal

#3 Cooperman

Cooperman

    Uncle Cooperman, Voted Mr TMF 2011

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 22,040 posts
  • Location: Cambs.
  • Local Club: MCR, HAMOC, Chelmsford M.C.

Posted 21 October 2020 - 11:14 PM

A standard FACET pump, the block-shaped one, the SS501 will be fine. I run such a pump on my Cooper 'S' and it is OK when flat out on narrow twisty roads and is then giving about 12 mpg. I have a pressure reducer just before the carbs (twin H4's). In fact I have a pair of those pumps plumbed in parallel, but that is just for reliability on rallies, not because one pump is insufficient.

That pump needs to be mounted at the rear. I have mine bolted inside the rear sub-frame on the laft with the bolts going through the horizontal rear seat panel. I never bother with the rubber mounts, but then I am not bothered by the pumps ticking noise.

I hope this helps.



#4 unburntfuelinthemorning

unburntfuelinthemorning

    Camshaft & Stage Two Head

  • TMF+ Member
  • PipPipPipPipPipPipPipPip
  • 1,588 posts
  • Location: Bedfordshire

Posted 25 October 2020 - 02:22 PM

The mechanical pump should suffice, someone will be along soon to give more sound information, if you feel that you need an electric pump use a low noise facet pump set to 3psi.

I will suggest you wire in a low oil pressure cut off to the fuel pump live feed for safety.

Regards and apologies I can't be of more help

Cal

Nice idea with the oil pressure cut off.



#5 cal844

cal844

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 7,988 posts
  • Location: Ballingry, Fife
  • Local Club: TFMOC

Posted 25 October 2020 - 02:51 PM


The mechanical pump should suffice, someone will be along soon to give more sound information, if you feel that you need an electric pump use a low noise facet pump set to 3psi.

I will suggest you wire in a low oil pressure cut off to the fuel pump live feed for safety.

Regards and apologies I can't be of more help

Cal

Nice idea with the oil pressure cut off.

It's for safety, so if the engine loses pressure (brings the light on) the fuel pump is cut

#6 Dusky

Dusky

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 5,089 posts
  • Location: Belgium

Posted 25 October 2020 - 03:04 PM

No reason to fit an electric pump here. I wouldnt want to faff around with wiring, relais, inertia switch ( mandatory for safety so you dont keep pumping fuel in a crash), drill holes,.. for no advantage.

#7 cal844

cal844

    Crazy About Mini's

  • Members
  • PipPipPipPipPipPipPipPipPipPip
  • 7,988 posts
  • Location: Ballingry, Fife
  • Local Club: TFMOC

Posted 25 October 2020 - 03:18 PM

No reason to fit an electric pump here. I wouldnt want to faff around with wiring, relais, inertia switch ( mandatory for safety so you dont keep pumping fuel in a crash), drill holes,.. for no advantage.


I agree, I'd gave the OP the choice

#8 Adam Johnson

Adam Johnson

    On The Road

  • Noobies
  • PipPip
  • 48 posts
  • Location: Southampton

Posted 26 October 2020 - 07:48 AM

Thanks all. They are some really helpful comments.



#9 Bobbins

Bobbins

    One Carb Or Two?

  • TMF+ Member
  • PipPipPipPipPipPipPip
  • 898 posts
  • Location: Chester

Posted 26 October 2020 - 10:19 AM

I have a newly built engine by Ian at Avonbar. I am running twin HS4s on it. The engine is 1330 and should reasonably quick (for a mini). Before I put the engine back in, would I need to replace the mechanical fuel pump with an electrical type. Will there be enough fuel from the SU pump?  If not, what would people recommend?

 

If you've had a new camshaft does it definitely have the lobe for a mechanical pump?

 

I'm not sure whether all cams available now have the extra lobe but many years ago I got caught out with this after fitting a 510 cam ... definitely some head scratching before i realised what was wrong!






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Mini Spares