21 replies to this topic

[jamieburke17]

hi everybody, im in the process of wiring up my facet fuel pump, electrics arnt my strong point so i was dreading messing about with relays and multimeters when i had an idea, cant i just wire a feed from my battery to a switch on my dash and then to the fuel pump so i can turn it on before i start the car? ill be chuffed if this can work   

[KernowCooper]

Not safe really, you need a relay operated by the 12v ignition feed and a inertia switch.

[1968andyf]

You can but use an in line fuse
but with a test light i use abulb holder from behind the dash you can find a switched live in the fuse box and run from that

[KernowCooper]

Still not safe if your involved in a accident, for obvious reasons the rally boys dont use a inertia switch, but advisable for a road car

[Carlos W]

Still not safe if your involved in a accident, for obvious reasons the rally boys dont use a inertia switch, but advisable for a road car

 

Car is on fire in a ditch and the pump is spraying fuel everywhere. 

 

It doesn't bare thinking about

[Brian422]

Why fit a relay? Pump only draws 5 Amps. Maplins sell switches that'll handle 10 Amps. Adding a relay will only add complications.

Edited by Brian422, 16 July 2015 - 02:52 PM.

[KernowCooper]

Because thats the way professionals wire it Brian, and its another 5amps your asking the Ignition switch that a 1/3 of its continous rating. Boy racers wire in switches Electricians use Relays

[Mini Manannán]

Still not safe if your involved in a accident, for obvious reasons the rally boys dont use a inertia switch, but advisable for a road car

 

I'm about to swap over to an electric pump so I want to fit an inertia switch.  I guess you use one on your motor KC, can you link to something suitable?  I've been surfing about and can't find anything suitable.

 Do you use an oil-pressure type cut-off? 

[Spider]

https://www.minispar...|Back to search

 

I think it's orientation would be important (can someone shed some light?).

Edited by Moke Spider, 17 July 2015 - 05:17 AM.

[Mini Manannán]

https://www.minispar...|Back to search

 

I think it's orientation would be important (can someone shed some light?).

Ah, cheers Chris, I saw that one on a Landrover site but wasn't sure if it would do the job, didn't even consider the Minispares.site

[Spider]

 

 didn't even consider the Minispares.site

 

 

Heaven forbid!  Why would you look there?  

 

Fancy looking at Mini Spares for Mini parts???    You know, I'd never thought of that either !

[Brian422]

Because thats the way professionals wire it Brian, and its another 5amps your asking the Ignition switch that a 1/3 of its continous rating. Boy racers wire in switches Electricians use Relays

Original minis didn't use relays.

[Cooperman]

I don't use relays on my twin FACET pumps. I have one wired as original (it's a Mk.1 loom) and the other is wired separately to make it 'fail-safe', so it has a separate fuse and switch, feed wire & earth.

Of course I don't use an inertia switch because it's a rally car.

Little inertia switch story: I once did a rally in my Rover 214Si. I was re-fuelling it when another similar Rover was towed onto the forecourt. I had been chatting with the driver at the start and I went over to see what had happened. He said that on a bumpy bit of route the engine had stopped and refused to start. I said to open the bonnet which he did. I re-set the inertia switch and it started immediately. The look of dismay on his face was a picture. I then showed him how my inertia switch was by-passed. I bet he did that before the next event  . £200 entry fee to retire over such a small preparation issue.

[KernowCooper]

 

Because thats the way professionals wire it Brian, and its another 5amps your asking the Ignition switch that a 1/3 of its continous rating. Boy racers wire in switches Electricians use Relays

Original minis didn't use relays.

 

Very true they didn't Brian and the reason for this is, The older pumps draw somewhere around 3-3.5amps, but in normal operation the points were closed for about 10% of the On/Off cycle, so the average current flow during normal operation is only about 10% of the  full current (amps) unlike the new fuel pumps which are a constant 5 amp draw continous through the ignition switch contacts, thats why we now use a relay.

[SMP]

If I were to get one of these switches does anybody know of a seller of connectors that would fit. I know I could walk into a scrapyard and get both together - btbh I just don't have the time nowadays - it would probably cost me half a day by time I've driven there and back. Cheers.