15 replies to this topic

[leepol83]

Hi ive just been reading a thread on here about facet fuel pumps and safety cut offs I have a facet electric fuel pump but have no safety cut off if I put my ignition on it will just keep pumping getting worried now as never really thought about it.Where do you get these safety devices from and what are my options.
thanks Lee.......

EDIT..

Right this is all I can find Click will this work also where do you mount it. If anyone knows where I can get one cheaper online could you please let me know
thank you regards Lee....

Edited by leepol83, 13 April 2010 - 06:55 PM.

[Surfbluegarage]

add a relay inline and a switch from the live feed to the pump or just a huge amperage switch but id say you might aswell wire i relay in.

[leepol83]

add a relay inline and a switch from the live feed to the pump or just a huge amperage switch but id say you might aswell wire i relay in.

So I could just put a swich in the car really and manually swich it off in the event of a crash how will a relay turn off the pump anyway.
thanks for youre help mate.

[tommy13]

I think the fuel cut off switch you have been reading about is a switch which is placed in series with the fuel pump supply wire sometimes also called an Inertia switch. Inside these switches is a mechanism which breaks the circuit if the car suffers a heavy bump, cutting the fuel supply to the engine and avoiding a potentially hazardous situation.
These switches can be reset by pressing a built in button. They should be rigidly mounted to the body in a suitable place so any impact energy is transferred to the switch.
Do a search on Ebay "Fuel cut off switch" you will find dozens of them, You also see the the square red rubber topped ones under the bonnets of many cars in the scrap yard.
The manual switch and relay mentioned in the last post is more useful as an anti theft device.

Edited by tommy13, 12 April 2010 - 09:07 PM.

[Surfbluegarage]

sorry my bad didnt even click you were talkin about inertia switches.. yeah like stated above you can get them from ebay or nip down your local scrappers and look under the bonnet of a rover for the small square black topped ones.

[leepol83]

Bump

[tommy13]

The link you have posted will work, It doesn't have to be a Rover one, this will do and is cheaper,

http://cgi.ebay.co.u...=item19bac5041e

They are mounted in various locations on different cars, from inside the spare wheel well, under the dash, inside the A pillar or on brackets under the bonnet. I suggest you mount it where it is convenient to connect into the fuel pump wiring.
As I said before, if you go to the scrap yard they should be less than a fiver, you can see how they are mounted and you can snip off a bit of the loom with the switch.

[leepol83]

The link you have posted will work, It doesn't have to be a Rover one, this will do and is cheaper,

http://cgi.ebay.co.u...=item19bac5041e

They are mounted in various locations on different cars, from inside the spare wheel well, under the dash, inside the A pillar or on brackets under the bonnet. I suggest you mount it where it is convenient to connect into the fuel pump wiring.
As I said before, if you go to the scrap yard they should be less than a fiver, you can see how they are mounted and you can snip off a bit of the loom with the switch.

Thats great thank you is it wired into the main power feed to the pump and is there anyway to test them when fitted

[Carlzilla]

mine just has an inline fuel cut off switch from ignition live to the pump mouted in a small switch panel above the drivers footwell next to the rear fog switch, never really switch it off but its there if i ever need it

[dklawson]

never really switch it off but its there if i ever need it

I don't mean this to sound rude or critical but in the event of an accident where you need to cut the fuel pump off, you are not likely to remember that switch even if you are lucky enough to be conscious.

[Pooky]

I have a manual switch and an inertia switch. I use my manual switch all the time. When ever I'm working on the Mini and need the electrics on, I can cut the fuel pump off so that it's not pushing lots of fuel up the line. It's also a rather effective theft prevention device. They'll only get a 100m or so down the road then it'll just die!

My intertia switch worked very effectively when I had an accident recently. I fitted mine to my lower dash rail, under the fresh air vent on the drivers side. I put it here so I could reach it from the drivers seat if it ever went switched off inadvertantly. It never has however.

[Dan]

is there anyway to test them when fitted

Once it's wired in, before you bolt it down give it a smack and see if the fuel pump stops. Then reset it and bolt it down. They are fairly failsafe devices frankly, there's not a lot that can go wrong with them. They have a latching switch that locks by an over centre device underneath and a ball bearing in a pit. Any jolt hard enough to unseat the ball makes it brush the latch which releases the switch. Simple. It should be wired so that it interrupts power to the pump directly, not so that it shuts down a relay controlling the pump. In a crash if the relay is crushed it might stay closed even if the control circuit is cut.

I consider them essential in a car with an electric fuel pump. I know a guy in the US who crashed a sportscar in California, he was unconcious after the crash but soon woke up when a jet of burning fuel from a severed fuel line made contact with his leg. He was trapped and couldn't move, it was horrific frankly and he ended up have both legs amputated because they were cooked.

[R1minimagic]

I have a few of these switches from various late minis i have broken for spares, PM me if you want one, cheers


pictures of one i fitted to my bike engined Mini

Edited by R1minimagic, 14 April 2010 - 10:12 AM.

[leepol83]

Thank you every one who has helped me with this really appreciate it. I have bought one today from the scrap yard and ime going to fit it at the weekend thanks again guys.....

[stevede]

I've just bought a facet pump and the instructions suggest fitting a cut off switch linked to oil pressure.

The theory being that if the engine stops the power is cut. Not sure how you prime the pump after fuel system work though. Have to work a bypass.