Anyone got any updated info on whether the fuel pump should be run at a constant 12v? I don't see why it would matter. Looks like if the Walbro was set up for 12V's it would be fine. The vortech T Rex pump is a walbro and it runs outside the tank. There can't be much difference between an intake and inline pump. I'm pretty sure the mustang guys run theirs at a constant 12V with no problems from what I've been trying to research.

I want to run mine with a separate relay and upgraded heavier wiring to support the bigger pump.

 

Which one do you want to connect via relay? The Trex should be wired that way, but the in tank pump should just plug in and run 12v. Are you using both?

 

I'm not going to use the T-Rex, it is less GPH than the 255 Walbro in tank. Just going to use the in tank. But I've read the wiring is not sufficient for the draw of the pump. It supposedly needs upgraded wiring. Was going to use a relay and then the trigger from the current pump to turn it off and on.

 

I see. The relay would work using the trigger from the fuel pump, so maybe there is an easier way to get ignition power to the relay, and have the relay mounted , with a new fuse, in a more convenient location. I thought that the intank pump was just a plug in deal, but I have seen mention of the wiring being marginal in some of the Mustang forums.
Maybe some on else can shed some light.....

 

The mustang guys say run it at a full 12V. There are plenty of them that run theirs that way all the time. Makes sense to me, it was designed to be run at 12 so I'm going to bypass the resistor stuff with a new relay and run it at the constant 12.

 

yea it wont hurt it, but it wouldnt be a bad idea to get a fuel pump controller, which will reduce voltage at idle and part throttle. I wasnt going to let my walbro 325lph run at full power just cruising around

 

Which controller did you go with?

 

http://www.madenterprise.com/F150.htm scroll down till you see it.

 

More wiring!!! Using TPS voltage is the most practical idea I've seen. Just make sure the voltage output is correct.

 

Cool, didn't realize he had them. I also saw the aeromotive one.