5 replies to this topic

[cheesebadger]

Hi,

 

I am installing a facet fuel pump. I would just like to run my wiring ideas past a few more people (please see attachment)

 

 Picture1.jpg   37.89K   27 downloads

 

I know something similar could be done with a 3 pin oil pressure switch, but I am struggling to find one that uses the original 1/8" NPT thread.

 

Any advice appreciated...

 

Cheers,

Rich

 

[cheesebadger]

Realised a bit of a mistake, put the fuse in the wrong place.

 

Please see revised dwg...

 

 Picture1.jpg   37.7K   21 downloads

[Captain Mainwaring]

Don't use the oil pressure switch - down right dangerous. 

Try getting stuck in the outside lane of the M25 on a dark night because of a dodgy oil pressure switch - happened to me a long time ago in a rover Vitesse - it was hair raising. My hair is still risen to this day,

 

If you are determined to do it, make sure you have a well labelled override switch on the dash to prevent you getting pulped, and for that matter have an audible alarm and a 15 second timer (omron make nice din rail ODT timers) to give yourself time to get out of trouble. 

 

You really don't need the carb prime override - you should build up oil pressure quickly enough without it.

Edited by Captain Mainwaring, 13 June 2014 - 02:49 AM.

[dklawson]

How much safety you want to employ is up to you.  I hate to sound like I am against safety but the more relays, switches, and interlocks you provide, the more difficult this is going to be to troubleshoot when (not if... when) something fails.  As a case in point, I have a simple kill switch on my cars that disables the ignition.  I am embarrased to tell you how many times I have been unable to start their engines because I forgot for a while that the kill switch was engaged.

 

I would focus on the inertia switch and let all the others go.  Again, that's just me and the level of protection I would want.  Frankly, my old British cars are 42 to 50 years old and none of them came with any safety switches in the fuel pump circuit.  Anything added within reason will be safer than what those cars have.

[cheesebadger]

Thanks for all the replies guys...

 

I think I am going to take the advice given and not bother with the oil pressure sensor, but I will fit the inertia switch. The inertia switch I have is 3 pin (GND/NO/NC) so I should be able to wire in a warning light to let me know when it has tripped. I will also wire in a hidden toggle switch for extra secuirty.

 

dk; my mini is a 1965 so it was originally fitted with an electric pump on the rear subframe, so the wiring is already there. I am just concerned that it isn't individually fused. This is why I would like to modify the wiring!

 

My final question.... any suggestions on the actual mounting location for the inertia switch? My initial thoughts were vertical (or as close as I can get) on the bulkhead in the engine bay; but I have read a few people say it is better within reach of the driver so that it can be reset without having to stop the vehicle.

 

Cheers,

Rich

[l_jonez]

I'd say fitting the switch inside within reach would be a good idea. When I had my mpi I had a few scary moments when the switch cut the fuel on motorways etc.