1G FWD Fuel Pump Rewire Kill Switch [merged 10/4/06]

[booosting92tsi]

I'm planning on doing a 1g fwd fuel pump rewire. I also want to put a kill switch on this fuel pump wire. By putting a kill switch in the fuel pump wire, will that affect the voltage? Will it defeat the purpose of the whole fuel pump rewire mod???

what kinda switch should i use, anyone out there done this???

 

[99gst_racer]

I'm planning on doing a 1g fwd fuel pump rewire. I also want to put a kill switch on this fuel pump wire. By putting a kill switch in the fuel pump wire, will that affect the voltage? Will it defeat the purpose of the whole fuel pump rewire mod???

what kinda switch should i use, anyone out there done this???

What would be your purpose for having a kill switch?

You could use a battery kill switch and wire it to the fuel pump.....

 

[92redman]

I am not exactly sure about what the fuel pump rewire is all about. The fuel pump is controlled by a relay though, if you put the switch between the ECU and relay, then no it won't affect your voltage. However, if you were planning on putting the switch on the other side, let's say between the relay and b+ or relay and pump, then you will be introducing extra resistance and creating a voltage drop to the pump.

Hope that answers your question.

 

[aleccolin]

Unless you're planning on cutting voltage to your pump every time you park, just put an inline fuse holder in the power wire coming from the battery (you need one in there anyway). One that uses ATC (two blade push-in style) fuses. When you park it for long periods or store it just flip open the fuse holder and pull the fuse. Looks just like cheesy amplifier wiring too, so it would be hard to just figure out easily.

 

[booosting92tsi]

(What would be your purpose for having a kill switch?)

the purpose? so people won't try to steal my car. duhhhhhh.......... I heard if you put a kill switch along the fuel pump wire, it won't start the due due to the fact no fuel is being sent to the engine, no matter how much someone tries to hot wire your car, they might be able to hot wire the ignition, but with no fuel the car ain't going nowhere........

all that being said, anyone have any HOW-TO mods on this????

 

[Quasimondo]

(What would be your purpose for having a kill switch?)

the purpose? so people won't try to steal my car. duhhhhhh.......... I heard if you put a kill switch along the fuel pump wire, it won't start the due due to the fact no fuel is being sent to the engine, no matter how much someone tries to hot wire your car, they might be able to hot wire the ignition, but with no fuel the car ain't going nowhere........

all that being said, anyone have any HOW-TO mods on this????

All a thief would have to do is short the switch and they'd have a working pump again.

There's no how to mod, but all you have to do is find a place along the wiring that's accessable, cut it, solder the switch in place, and you'd be done.

 

[booosting92tsi]

All a thief would have to do is short the switch and they'd have a working pump again.

There's no how to mod, but all you have to do is find a place along the wiring that's accessable, cut it, solder the switch in place, and you'd be done.

obviously, i would have to hide the switch very carefully so a thief wouldn't find it......

the point is, bringing to my original question, putting a switch between the fuel pump and the engine, would that drop the voltage ? i wannna increase the voltage to the fuel pump by doing this rewire mod(thicher gauge wire). would a switch defeat the whole purpose of that?

 

[Quasimondo]

As long as the switch is rated at 30 amps, along with the relay and fuse, you won't see any voltage drops.

 

[92redman]

As long as the switch is rated at 30 amps, along with the relay and fuse, you won't see any voltage drops.

That's incorrect. Have you ever measured the resistance in a switch? Any electrical connection has resistance and therefore a voltage drop. The point of the rewire is to get the best voltage to the pump, and the best voltage is a straight wire with no connections.


Just follow the vfaq instructions. It just tells you the same thing I said earlier, add the switch to the power or ground of the coil side of the relay.
http://www.vfaq.com/mods/pump-relay.html

 

[trbotaln]

I had a kill switch on my honda connected to the fuel pump and it worked great. I had a barrel key so nobody could short the switch (no need to hide it). The reason I don't have one on my talon is because of my turbo timer, so I don't want to sit their and wait for the turbo to cool

 

[IHeartTurbo]

That's incorrect. Have you ever measured the resistance in a switch? Any electrical connection has resistance and therefore a voltage drop. The point of the rewire is to get the best voltage to the pump, and the best voltage is a straight wire with no connections.

Wrong. A switch or connection will only have resistance if the connections don't fit together properly or if there is corrosion.

Just put the switch on the ground side of the new relay.

 

[FourG63GST]

So...

I have 10 gauge wire from FP to battery with relay / inline fuse etc.

Could I just cut the 10 gauge wire in half somehwhere inside the car, and solder a switch inbetween and hide it?

 

[IHeartTurbo]

You could, but it's just as easy to wire it into the ground.

 

[FourG63GST]

You could, but it's just as easy to wire it into the ground.

I honestly am an electrical noob and have no idea what that meens. could you explain with more detail...thanks!

 

[IHeartTurbo]

Ok, with the fuel pump rewire, your have to use a new relay. That relay needs a ground. Run that wire to a switch, then from that switch to ground. With the switch off, it puts an open in the ground wire. This makes it so the coil of wire in the relay can't enegize and complete the circuit for the fuel pump, thus not turning it on.

 

[Lazer RS]

hmm
that all seems all lot of work compared to whaty i did. i just put a switch off my clutch switch. if the switch is off ,computer thinks clutch is not engaged so no start. works for me

 

[aleccolin]

hmm
that all seems all lot of work compared to whaty i did. i just put a switch off my clutch switch. if the switch is off ,computer thinks clutch is not engaged so no start. works for me

Damn good idea.

 

[booosting92tsi]

hmm
that all seems all lot of work compared to whaty i did. i just put a switch off my clutch switch. if the switch is off ,computer thinks clutch is not engaged so no start. works for me

true......but what if you have an automatic turbo like me......no clutch to press, no switch in the pedal........

that's why i need to put a kill switch between the new relay from the rewire mod and ground battery

 

[aleccolin]

Same thing, just use the neutral/safety switch. Car won't start if it thinks it's in a drive gear.

 

[booosting92tsi]

Same thing, just use the neutral/safety switch. Car won't start if it thinks it's in a drive gear.

can u elaborate a little bit more on this neutral/safety switch???

i know if an automatic dsm is on neutral and u turn the ignition, it won't start.....

how do i go about putting a switch on that?? do i need to tap somewhere in the ECU HARNESS???

WHAT KINDA SWITCH IS BEST FOR THIS APPLICATIONS?

 

[booosting92tsi]

Same thing, just use the neutral/safety switch. Car won't start if it thinks it's in a drive gear.

correction, on a 1G DSM Automatic, u can only turn on the car if the gear lever in on P(park) or N(neautral)

but if is on 1, 2, L, R, IT WON'T START. how can i put a kill switch all that being said?

 

[tsunari]

hmm
that all seems all lot of work compared to whaty i did. i just put a switch off my clutch switch. if the switch is off ,computer thinks clutch is not engaged so no start. works for me

I agree . . . MUCH easier doing it this way- you guys that need a writeup should check the tech section. I wrote one up a while back. --works great!

 

[booosting92tsi]

I agree . . . MUCH easier doing it this way- you guys that need a writeup should check the tech section. I wrote one up a while back. --works great!

I have an automatic, not a 5 speed. so what do i do?

 

[primalfear600]

I would like to install a kill switch for my fuel pump to help with anti-theft. I was wondering if anyone had a how to on this. I was also wondering what i would need exactly to do this and how strong the conectors would have to be. I would like to get this in as soon as possible thanks.

 

[blackbyrd]

http://www.dsmtuners.com/forums/showthread.php?t=150701&highlight=fuel+kill+switch
http://www.vfaq.com/mods/pump-relay.html

I hope this helps. I've been debating on doing this, but I was thinking about doing something crazy like havening to have the lighter pushed in and the A/C on to start the car. Or maybe a turn signal.
Good luck!