fastrax203

I have a '97 Miata w/ MSPNP installed. I was wondering if I could manually switch the fuel pump on to drain fuel from the tank. I'm retarded and put regular into it. I want to put a line from the fuel feed into a gas can and pump the regular into it until I have a couple gallons left and re-tank to premium. Is there a way to do this?

ScottFW

iTrader: (4)

If you just need the fuel pump to run, open the diagnostic box under the hood on the driver's side, use a wire or paper clip to jumper F/P and GND, then turn on the ignition.

thirdgen

iTrader: (26)

By regular, you mean 87 octane? How about you just drive the car? 87 won't hurt it a bit, just don't let your vac/ boost gauge go over 0.

fastrax203

And just drive around aimlessly to waste gas? I just paid $26 for the tank and I'd rather put it in my DD instead.

Thanks ScottFW, I'll give that a go tomorrow.

thirdgen

iTrader: (26)

Well in that case...
See I use my car for daily use, so if I filled up with 87 by accident I'd have to drive it to work for a week and be gentle. In your case though, I see your point.

Ben

iTrader: (33)

The MS2 and MS3 ECUs actually have a fuel pump test mode which would work for situations like this, but the MS1 (the MSPNP is MS1 based) does not do this.

Your best option would be to jump the fuel pump at the diagnostic connector.

fastrax203

Thanks guys, I got it.