Check connector, and fuel pump relay rewire/hotwire...
 

the car: 1991 s5 FC

ok heres my deal... i need to find the check connector... thats all i know

and now i wanna know if anyone has ever rewired thier fuel pump and used a toggle switch instead of relying on the relay, or if they have somehow bypassed the relay... if there is a writeup on this somewhere can someone send me the link, i have been searching forever... thanks

It's beside the right strut tower in the engine bay. It's a bright yellow 2-pin connector.

Operating the fuel pump with a switch is a terrible idea. Why would you want to do that?

when you rewire it just make sure it has 12 volts... My fuel pump gets ground from the body so i only had to rewire one wire.

Please verify you're looking for the fuel pump check connector and tell us why.

If you're trying to connect a fuel cutoff switch, you don't have to bypass the relay - you just have to wire a switch before the relay coil (low current side). The circuit opening relay is located under the steering column.

That won't work quite that simply. The circuit opening relay has two coils that can trigger the switch; one from the start circuit (on during cranking) and the other from the AFM airflow switch (S4) or ECU (S5). You'd need to wire a double-pole switch across both circuits to be able to turn the tump off. It's easier just to put a normal switch in either the wire from the fuse or the wire to the pump (both at the relay).

My first generation 7 ended up running off a toggle switch for the fuel pump. That was the WORST thing I ever did, keep it on the relay trust me youll thank us for it down the road!!

Chris

does anyone know where i can get the relay thats in the engine bay then.. its an s5 and i cant find it anywhere

The relay engine in the engine bay controls the fan speed. It doesn't turn it on and off.

Instead of asking random questions, tell us exactly what the problem is and I'm sure we can help you fix whatever's wrong.

the car gets to normal operating temp, fuel shuts off, and wont turn back on for a while

So get your meter out and put one lead to gnd. Put the other lead into the backside of the large BLUE wire at the fuel pumps connector, with the plug connected up.

Actually the pumps plug has two halves. ON the chassis side of the plug the wire is BLUE. On the fuel pump side it turns to a black/white color.

Start the car and look at the voltage. Itll drop down from an initial 12v to approx 9 vdc after a few moments.

When the engine dies, see what the voltage reads.

No meter.....no help.

Yep, prove it's actually the pump before hacking up all your wiring. And if it is, fix the problem instead.