7 replies to this topic

[gazza01]

I would like to know if the standard mechanical fuel pumps can deliver enough fuel for the weber 45 DCOE. (3.5 max psi).

 

Thanks.

 

[Dusky]

I haven't seen many webers with a normal fuel pump . An electric fuel pump is worth the money too I heard ( some BHP gain).

However , the need of fuel depends on the car, so a normal fuel pump can be enough if the car doesn't need more fuel

 

grtz!

[Gremlin]

The carburettor won't make any difference, what other engine modifications have you done as if set up correctly, any carb will need the same amount of fuel

[GreenMini17]

I doubt the standard pump would be able to supply enough pressure for the weber, especially up in the revs where the weber is very good. Its an easy and fairly cheap job to remove the old mechanical pump and fit a Facet (make sure its a real one, not a copy on ebay) either a fast road solid state or a red top. I think a red top would be over kill for just the one carb though. Give Merlin Motorsport a call and they will help you out. You may need a regulator too.

[coopdog]

I ran a 28/36 weber with the 25 year old pump with no problems.

But it's up to your if you want to run a newer one, won't do no harm

[Ivor Badger]

Pressure has nothing to do with it, it's delivery volume that matters. The norm for a simple electric pump on a Weber was to use a MGC pump. Or possibly easier to find 2nd hand, the double pump from an XJ6. One side is enough to supply a Weber.

[brad-the-bear]

don't want to steel the thread but am also going to be running a 45 dcoe weber on a 1380 with a Kent MD276 cam. would a electric pump be needed or will the mechanical one suffice? 

 

cheers,

bear.

[GreenMini17]

don't want to steel the thread but am also going to be running a 45 dcoe weber on a 1380 with a Kent MD276 cam. would a electric pump be needed or will the mechanical one suffice? 
 
cheers,
bear.

If your moving away from an su on a pretty much standard engine, i would use an electric pump. They are simple to install, pretty cheap and very reliable. I cannot stress how important it is NOT to buy a cheap copy version of a Facet pump. Facet pumps are the original and the most reliable. And get a bad name from the cheap copies floating around. They do a new pump called a Posi-Flo which is a much smaller plastic cased pump which could easily be hidden in the engine bay of a mini. Unless your a tight git i see no reason to keep the standard mechanical pump on even a slightly modified engine.