Fuel pump for injection system

[jasper]

Hi there
this is my first post and was looking for advice on the following

Wher can i buy a fuel pump for my Cobra kit, the specification is 1.75 l / minute, greater than 4.0 bar. its for a BMW m60 engine.I seem to only find low pressure pumps

Also any pointers on where to buy copper fuel pipe both 8 and 10 mm bore

Will SVA test accept jubilee clips to connect flexible fuel line to pipe

Many Thanks

[plod]

Hi Jasper,

No idea but welcome.

We'll need to know who you are and where you're from (Cilla) and what cob! Engine, colour etc. etc etc.

I am sure someone more sensible will be along in a moment

[TonyD]

Hi,

Its someone more sensible here.

Fuel injecting BMW engines is a speciality of mine.

Get yourself along to FAB breakers near Gloucester, either in person or via the interweb thingy, and buy yourself the intank fuel pump and swirl pot from the relevant engine and fit both into your fuel tank. This should cost you about half what an aftermarket bosch fuel pump would cost you and has the added advantage that it wont burn out when its trying to suck fuel against the g forces on corners and acceleration.

Don't ask me why I know this, but I do have a collection of burnt out bosch fuel pumps on my garage windowsill.

Remember to fit a large metal cased fuel filter after the pump to save your injectors getting blocked with crud etc.

I used 10mm copper pipe from Wickes ( microbore central heating pipe) for my fuel lines, both feed and return, with swaged ends and doubled up on the jubilee clips and it passed without any problems.

As Plod said whats the kit, engine specs etc?

Cheers,

Tony

[jasper]

Thanks tony D

The kit is an RV Dynamics Python, the donor is a BMW e34 530i V8. I'm just coming up to rolling chassis. I did not keep the in tank pump from the donor as top access to the tank is not possible with the body on. I guess i'm going to have some burnt out pumps.


Thanks

[TonyD]

Originally Posted by jasper

Thanks tony D

The kit is an RV Dynamics Python, the donor is a BMW e34 530i V8. I'm just coming up to rolling chassis. I did not keep the in tank pump from the donor as top access to the tank is not possible with the body on. I guess i'm going to have some burnt out pumps.


Thanks

Wheres the fuel tank positioned? If its high up in the chassis mount an external swirl pot lower than the tank, stick an immersed pump and the return line into the swirl pot, and feed the swirl pot pot using a high capacity low pressure pump from the tank itself. This way gravity helps the pump and you wont suffer fuel starvation on acceleration or cornering or burnt out pumps. You can get external swirl pots from Merlin Motorsport, Demon Tweeks etc.

Although the ECU will protect the engine to some degree from running too lean you really do not want to be getting fuel starvation when you are accelerating out of trouble ( or just having a blast). My strong advice would be to emulate as closely as possible what BMW did for their fuel system.

Failure to do this will lead to poor running, loss of power, potential safety issues and possible embarrasment both from loss of power at inappropriate moments and having to be frequently recovered on a low loader when the fuel pump packs in.

Cheers,

Tony