How do I fit an mpi tank into my Mayfair
Turbo Mini Forums

Hi I'm putting an mpi tank into my Mayfair shell as I will be running a charger my question are

1 how is it best to run the electrics to run the pump

2 how is the best way to run fuel lines as I will need a return

Thanks sorry for the stupid question just want to make sure I do it correct

what year mayfair? if its an injection model this will all plug straight in

To wire it up, you need a supply from a relay that is switched on by turning the key to ignition position 2, if you have megajolt or an ecu you can then control the earth for the switched side of a relay on when the engine is rotating.

You then need a good fused supply to the other side of the relay, which in turn runs to an inertia cut off switch and then the positive terminal on the tank. Run the earth from the tank to the body somewhere (rear light nut on my car). You can tell which is the negative as it comes out of the back of the plug and goes straight onto the metal top of the pump cover.

For the fuel lines, run them any way you can. Injection cars had an oblong rubber bung with three holes in it. Would be a shame to cut up your freshly painted boot floor though...

Thanks mate I will have a look into that. I will be running a megajolt. Don't really want to cut holes in the car if I can help it lol

Edited by Clive1330 on 16th Dec, 2013.

I'm looking at using an MPi tank on the UJ car for an article, and I'm not intending running a return line.
According to the fine chaps at SC, you can fit a fixed=pressure pressure regulator in the boot and plumb the return in without needing another front/rear fuel line.
With a 'charger, I'm guessing you won't be having a boost knob so fixed pressure arriving at the front shouldn't be a problem.

Metric is for people who can't do fractions.

Dug this up, have the following question. The third connection to the tank I believe is the vent pipe.
Where is the vent pipe supposed to be run to and can fuel escape down it? Cheers

dazibee - the third pipe (vent) runs to a charcoal cannister located in the front left wheel arch.
Fitted one to the marcos, modelled on my mpi.