Elec fuel pump wiring

[datsfun]

I am in the process of installing a red top facet fuel pump. The plan is to fit an inline fuse and also an inertia switch (which shuts fuel pump ) in the event of an accident.

There seems to be differung opinions as to where to pick up the "live" from. Some say , just splice the live feed from ignition barrel, others say coil, etc etc...

So where would you get the live (power) from and why?

 

[malcolmpaul]

I took the live from an ignition switched live and fitted an in line fuse like you say

 

[zbloke]

Here's what I did, been ok for a few years now

http://zclub.net/forum/14221-post6.html

 

[richiep]

My setup is the same as zbloke's, with the exception that I also have an oil pressure cutoff switch wired into the circuit for safety.

 

[datsfun]

Thanks chaps..

A numpty question...where you are feeding the "switch" into the relay via the coil, is there a danger that if the coil starts to misbehave, then the signal to the fuel pump is affected accordingly using this set up??

I need to look at my red top carefully, AFAIK, there is only 1 wire to be connected, ( being the live) and no sign of the earth cable...?

 

[jonbills]

It earths through its mount to the body.
On my 260, i already had ignition switched power to the tank, so i have the relay by the tank with the pump and a punto inertia switch by the starter motor where i took the live feed.

 

[datsfun]

It earths through its mount to the body..

Thanks, I thought as much but when I read some of the replies and how earth is connected back to bulkhead, it got me thinking...did I say I dont understand electrics..

relay by the tank with the pump and a punto inertia switch by the starter motor where i took the live feed.

Does the location of the inetia switch matter? I mean it has to be accessible in case you have to reset it ,but other than that, anywhere convinient would do IMHO

 

[jonbills]

I agree. I only put it in engine bay so it would be easy to reset and easy to install.

 

[zbloke]

If you intend to use the rubber bobbins to mount the pump you will need a cable of some sort to earth the pump, I think there was one in the kit I got, short piece of wire with a ring terminal on either end

I choose to bring my earth wire back to the engine bay to an existing earth point, I didn't want it under the rear of the car where it could/would get water/road dirt/salt and any other rubbish around it and start to corrode and turn green

The SW feed I mentioned is simply a wire taken from a terminal on the switched feed/ignition feed side of the ignition coil, so it switches the relay on when the ignition is switched on