EFI system design for classic car

[diurno]

Hi guys,

We are currently restoring a MGB GT from 1975, we are in the process of redesigning the fuel system as the car is being fitted with a Mazda MX5 NB engine thus requiring a EFI configuration instead of the carbs.
Our design is going to be as following ~ fuel tank with sender unit --> pre slow continuous flow pump filter --> swirl pot --> pre high flow pump filter --> high flow pump --> t junction with a regulator at one end and the other end gong directly to the fuel rail. Return lines will be coming from the fuel regulator and the swirl pot itself so it drains to the fuel tank once full.

Any recommendations of fuel pumps to use, both to provide the slow continuous flow and the high flow. Or fuel pump shops we need to have a look at?

Thanks!

[one eyed mick]

Why not use the Mazda set up from the donor car ? it.s raced on heavily and nobody seems to have probs , pehaps uprate the pump to a comp one why get too complicated?

[stevieturbo]

diurno said:

Hi guys,

We are currently restoring a MGB GT from 1975, we are in the process of redesigning the fuel system as the car is being fitted with a Mazda MX5 NB engine thus requiring a EFI configuration instead of the carbs.
Our design is going to be as following ~ fuel tank with sender unit --> pre slow continuous flow pump filter --> swirl pot --> pre high flow pump filter --> high flow pump --> t junction with a regulator at one end and the other end gong directly to the fuel rail. Return lines will be coming from the fuel regulator and the swirl pot itself so it drains to the fuel tank once full.

Any recommendations of fuel pumps to use, both to provide the slow continuous flow and the high flow. Or fuel pump shops we need to have a look at?

Thanks!

Facet make a lot of low pressure pumps that are readily available in the UK

I always prefer the lift pump to have a flow capacity beyond that of the high pressure pump.

For main efi pump, really there are dozens of options. For a lowish powered n/a engine it wont need anything particularly special.

http://www.glencoeltd.co.uk/

[griff 200]

It will be a lot easier if you could mod the tank and use the in tank high pressure pump out of the Mazda , Ive just made up a swirl pot system on my Tvr project using a silver low pressure and large 044 high pressure pump but it's a lot of plumbing hell of a cost and the race boys just use an in tank system so if I did it again I'd go I tank. Good luck any how. Richard