Justin@VMP
July 6th, 2007, 11:28 AM
Upgrading the wire powering the FPDM (Fuel Pump Drive Module) will result in ~10% drop in duty cycle. The factory wire is small gauge and has to run through a few relays and the inertia switch, this results in a voltage drop by the time it gets to the FPDM in the trunk. The wiring from the FPDM to the pump can be upgraded as well, but just running a larger wire to the FPDM will result in good gains.
For single pumps I recomend a 10 or 12ga wire, for dual pumps I recomend an 8 or 10 ga wire. You will need a fuse holder with 30amp fuse, ~15' of wire, a relay with socket, and a butt connector.
Run a fused circuit from the battery. You can hook it up to the side of the battery, run it under the battery, into the fenderwell (remove the wheel and fender liner), in the back of the fenderwell there is a rubber grommet going through the firewall into the passenger footwell area. You can then run the wire behind the kick panel, under the door sill, under the back seat, into the trunk, and to the back of the spare tire well.
Use a standard 4/5pin automotive style relay. The center pin is not used. The two side pins, 85 and 86, are for the relay coil, they trigger the relay when ground and +12v is applied. Run one of them to ground, the other one will be hooked up to the white wire going into the FPDM, coming from the harness. We will use the factory FPDM power signal to trigger the relay. 30 is the input for the relay, connector your heavy gauge wire to this pin. 87 is the output for the relay, connect this to the white wire going into the FPDM.
http://vmptuning.com/downloads/wiring_diagrams/05/05FPDMconn.jpg
http://vmptuning.com/downloads/wiring_diagrams/05/05FPDM.jpg
For single pumps I recomend a 10 or 12ga wire, for dual pumps I recomend an 8 or 10 ga wire. You will need a fuse holder with 30amp fuse, ~15' of wire, a relay with socket, and a butt connector.
Run a fused circuit from the battery. You can hook it up to the side of the battery, run it under the battery, into the fenderwell (remove the wheel and fender liner), in the back of the fenderwell there is a rubber grommet going through the firewall into the passenger footwell area. You can then run the wire behind the kick panel, under the door sill, under the back seat, into the trunk, and to the back of the spare tire well.
Use a standard 4/5pin automotive style relay. The center pin is not used. The two side pins, 85 and 86, are for the relay coil, they trigger the relay when ground and +12v is applied. Run one of them to ground, the other one will be hooked up to the white wire going into the FPDM, coming from the harness. We will use the factory FPDM power signal to trigger the relay. 30 is the input for the relay, connector your heavy gauge wire to this pin. 87 is the output for the relay, connect this to the white wire going into the FPDM.
http://vmptuning.com/downloads/wiring_diagrams/05/05FPDMconn.jpg
http://vmptuning.com/downloads/wiring_diagrams/05/05FPDM.jpg