i have heard of guys in 240's with the SR motors in them that hard wire their pumps so that they have enough voltage to pump the fuel that they need. i am doing this to my car, and i'm curious if anyone else has done it? if so could you let me know how you did it. thanks

 

Could you a little more specific on why your doing this? What does it improve?

 

The current requirements for a stock pump are probably less than the aftermarket one so it probably ends up reducing the voltage to the pump.

I don't know of anyone who has done that but sounds like it could be a good idea. I guess the first step should be measuring the voltage at the pump with it running to see if there really is any drop.

 

Thanks. It is a good idea, if there really isn't enough voltage going to the aftermarket one. It would also be a good time to put a kill switch in.

 

Since I'm worried about fuel pressure, and I had just installed a GSS317 Walbro 255lph pump AND I still had my back seat out, I connected a digital voltmeter to the two wires that go into the actual connector going to the pump, under the top tank cover. In a '99, they are blk/yel and blk/silver.

When the motor was started, the voltage going directly to the pump was 12.90-12.92 volts. Revving the engine didn't make a difference. I guess this is pretty close to the nominal 13.5 volts on the battery when the engine is running. It doesn't seem there is significant voltage drop at the pump, but those wires do seem small for the job.