Fuel Pump Rewire Question!

[JoEgsX90]

Ok guys well i gotta question, when i got the car someone rewired the Fuel pump 190... They had a thick gauge wire im guessing to a system a AMP and SUB it was running from the Positive of the Battery with a fuse holder to the rear of the car. When they rewired the fuel pump they TAPPED into that thick wire running from the Positive battery. The audio system is not there anymore i got the car withought it so its just the wire running to the trunk and in the middle fuel pump is tapped into it. Can this cause some kind of problem? Especially since the fuel pump has power all the time from the battery? Let me know what u guys think.

 

[habitatguy187]

It sounds like it should be ok. That's how a re-wire is done, but instead of tapping you usually buy a relay. And the fuel pump is supposed to always have power anyway. (idling still pumps fuel)

 

[matthewdesigns]

I would be a good idea to install a fuse somewhere between the battery and the pump, as it sounds like the tap for the pump is between the battery and the fuse block. Check to see if there's a fuse closer to the battery, perhaps inline before the lead goes through the firewall. If not, put one in just to be safe.

And all the rewires I've seen (and the one I did on my car) use a relay, like habitatguy suggests. Go to VFAQ Site - Visual Frequently Answered Questions and find the rewire writeup for your car, and check to see if your install looks like those. Chances are there's a relay somewhere in the circuit, as having it straight wired would just leave it on all the time, and would be an obvious drain on the battery, as well as a bad idea in general. The function of the relay is to connect the main power to the pump through an automatic switch that is "flipped" by a secondary electrical signal when the ignition switch hits the "On" position. Usually, the signal current is from the original factory pump power lead.