mr z28

There are 3 lines that come from the tank 1 small 1 med. an 1 large does any one know what is what which is fuel which is return a which is the canister. thanks.

five7kid

iTrader: (14)

3/8" = supply
5/16" = return
1/4" = vapor recovery

mr z28

This is what Iam trying to do . The wires in the car some are gone I had to rewire some of the wires they told me the brown wire goes to the fuel pump ok but where can I pick it up at somewhere in the car the wires on the firewall I said some are gone is there a place where I can find it in the car along the trim by the door I need to wire a new relay to it to get it to work hope I didnt confused you guys Thank yous.

five7kid

iTrader: (14)

If your two questions are unrelated, no. If they are related, then I'm thoroughly confused.

Hooking up a relay isn't too hard. If your wiring has been bastardized, it might be best to start from scratch. Is it fair to assume you aren't doing a factory-type computerized set-up?

The factory used a relay that had switched voltage (powered when the ignition is on) to the coil terminal. When the ECM wanted to turn on the fuel pump, it would ground the other side of the coil terminal. The switch terminals of the relay had battery power on one side and the fuel pump on the other.

For a non-computer set-up, do it the same, except have switched power on one side the coil and the other side grounded instead of going to the ECM. When you turn on the ignition, the fuel pump will come on.

mr z28

Iam running a msd box an coil are you saying run a hot wire to the coil so when you turn the key power will go to pump? an do I need a relay? Wires are all messed up .

five7kid

iTrader: (14)

I wouldn't run a hot wire from the ignition power to the fuel pump. It may not hurt with an MSD box because it gets power from the battery (the ignition switch just turns the box on and off), but a relay is still the best way to power an electric fuel pump.

Be sure to include a proper fuse for both the pump and relay.