17 replies to this topic

[minilee94]

How do you wire in a fuel pump to a switch thanks

It's a facet solid state

And I only want it run by a switch not to turn on when ignition is switched on

Thanks

[coopdog]

i run it on the rear window demister switch because it never worked anyway,

i took it straight from the spade on the window too

[minilee94]

Okay cheers mate good way to be honest

Only think is I already had drilled a hole in dash for fuel pump switch but I Duna how to wire it

[chuffed]

Either wire it from a constant live wire into the switch or from an ignition live wire.

[Cerberus]

Or wire it up with a relay and a feed from the alternator (the wire that goes to the ign light) and a feed to the relay from the low side of the starter motor.

Just need a diode for the bit with the alternator and you've got a fuel pump that will only run if the alternator is charging or if the starter it cranking.

I can put up a wiring diagram if you like.

 

 

Then of course you could also put a inertia cut off in, if you just do a switch it might be a good idea to have an inertia cut off should the worst happen.

Edited by Cerberus, 10 July 2014 - 09:35 PM.

[Cooperman]

I have twin FACET pumps fitted in parallel.

One is wired directly from the ignition circuit and the other from a separate power feed to a separate individual fuse, to a separate switch, from there to the pump and from the pump to earth.

It's a rally car so any form of inertia switch is no good as it would cut out over bumpy roads.

[minilee94]

Nah I don't want to wire it to ignition as I want to be able to be kind on anti theft device so the car won't start with out it being switched on

[KernowCooper]

You problem will be if its a carb engine with the pump turned off, it will start and run several hundreds of yards before the float bowl runs dry of fuel. use a hidden switch to earth the coil out will stop it starting

[Cooperman]

Run the cable from the ignition to a hidden switch, then to the pump.

What happens when someone tries to nick the car is that the engine starts, runs for a bit during which time the thief starts to drive away, then it just stops, usually not where the thief wants it to, like in the middle of a main road. That way he/she will be deterred from trying to find out why the engine has failed to run. My friend who was a Met Police Officer advised me to do that.

[zerobelow]

Just hope that the car doesn't get run over when the engine cuts out in the middle of an intersection :). 

 

As for a street car, you want some sort of device to shut it off in the event of a collision. Inertia switch, or wire it in to an oil pressure switch, or wire it with the diode to the alternator line as suggested.

 

That said, you just need 12v to the red wire, and connect the black one to the chassis. Get power from a fused circuit, or get one of those inline fuse things, run that over to the switch, and then to the pump. The safety device can go anywhere in the circuit along the +12v wire. 

[minilee94]

When you say a cut of in the case of an accident can I just not switch the switch off to turn the pump off

[minilee94]

Run the cable from the ignition to a hidden switch, then to the pump.What happens when someone tries to nick the car is that the engine starts, runs for a bit during which time the thief starts to drive away, then it just stops, usually not where the thief wants it to, like in the middle of a main road. That way he/she will be deterred from trying to find out why the engine has failed to run. My friend who was a Met Police Officer advised me to do that.

Hi pete I have a switch in the dash that I want to use for a few pump switch none of my switches are labeled up so no one will will really know also my car used to be an auto and I still have the inhibitor switch wires so I'm going to link them up to a switch
Wich is hidden

[zerobelow]

Re: turning the switch off -- if you are conscious after the accident, then turning it off is a good idea. Just hope you don't end up like this guy (no clue how true story, but it makes sense): http://www.theminifo...pump/?p=1796667

[McPhie]

I got one of these and wired it in series with the fuel pump

http://cgi.ebay.co.u...em=231269502825

 

Works perfectly and feel a lot safer now. Last thing you want in an accident is the fuel tank emptying all over the place!

[minilee94]

Cheers il have one of them