Fuel Pump Wiring On Rally Car

[andychalmers 0]

What is the best way (for rallying i.e. simple) to wire the electric fuel pump in a 205 GTI?

 

I want to bin all the crap such as tacho relay etc and make it less likely to fail. So in basic terms live straight to pump, so what switches, fuses, relays etc do i need?

[RossD 43]

On my project build, I've wired a relay into the switched live from the ignition switch which then feeds the fuel pump. I think thats the simplest way to do it, unless you want to actually manually switch the fuel pump.

Careful though, there are several switched +12v feeds, only one of them is 12v when cranking though - You need this.

[Spiky 37]

not quite the same but close.

 

i have 2 fuel pumps.

 

which have a relay and a fuse EACH

 

the trigger from the ECU, switch's on the relay's which then feeds 2 30a cables to each fuel pump

 

[andychalmers 0]

cheers guys, i forgot to mention I have a master cut off switch, omex 500 ECU, Jenvey TB's and a switch on the pump. Car is purly used for rallying, no road milage. My pump just stopped working but a direct live works fine, its running what looks like a 306 fuel relay with shed loads of wires going everywhere. This needs binning.

 

Spikey, your install sounds mint, can let me know what equipment you have & how its connected etc as I would like to run 2 pumps, totally separate with switches. Also what rating fuse do you use?

[Spiky 37]

i run 30/35 amp cable from the perm live (aftercut fia cut off switch, the switch kills the power)

 

to 2 fuses (25amp) then to two relays

 

the relays are switch from the ecu output.

 

once switch switch, i run 2 30/35 amp cables to the fuel pumps

 

so the ecu turns on both the same time

 

got all my stuff from vehicle wiring products

[Sandy 189]

I strongly advise that you have it ECU controlled or at the least with an inertia switch (although that can be bothersome if it's too sensitive). You really want the pump to cut instantly in an accident.

 

The OMEX 500 can control the pump, but I think it shares the output with the tacho or similar, so you can only have one or the other.

[andychalmers 0]

Thanks lads again, all good info. Spikey, what hardware setup do you have? make of pumps etc

cheers

[Spiky 37]

Thanks lads again, all good info. Spikey, what hardware setup do you have? make of pumps etc

cheers

 

 

a std pump in the tank to fill my swirl pot

 

and a cosworth grp a pump (044) behind my seat (soon to be relocated under neath. by the rear beam