ITSWILL

iTrader: (12)

88 rx7 Turbo II
ok i had the car running the other day. I had to start it with fresh gas down the intake after the intercooler but it started. I put 10 gallons of fresh gas in it but now i don't even hear the fuel pump running anymore. Its like one step forward and two steps back with this thing. I checked voltage at the pump with the key turned to the ignition point and cranking and from the top connection down i got zero volts, 3 volts and 2 volts. any ideas why im not getting power. Checked all the fuses under the hood and they were all good. Do any of the fuses in the car control fuel. Oh and is EGI fuel because i found the egi relay but didnt know how to check it or even if it had anything to do with my porblem. Any help would be much appreciated.

also i dont know if this has anything to do with it but there is an amber toggle switch near the hood release on my car. Any ideas what that is?

manuelxj

iTrader: (2)

might be a kill switch

Captain Jean-Luc Picard

A locked fuel pump can drain much of the voltage in the fuel pump supply wire. Try unplugging the fuel pump and then checking for voltage on the fuel pump wire (while trying to start the engine). FOr instance, I have checked voltage and gotten only 8 or 9v, unplugged the pump and gotten 12.5, then pulled the pump out to find it locked up.

ITSWILL

iTrader: (12)

ok ill give that a try. Does anyone know which contact on the pump is what. The ground is pretty obvious but there are 3 others i know one must be for the pump and one for the sending unit but i dont know what the other on is and also i dont know what is what. As for the the toggle switch it looks pretty stock but i dont think its a kill switch.

Thanks guys

ITSWILL

iTrader: (12)

ok this may be a stupid question but how do you unplug the fuel pump. there are little black caps on top of the wires going into it but they dont seem so come off. is there a plug somewhere?

Captain Jean-Luc Picard

The plug is about 4 inches below and behind the driver strut tower speaker.

The 2 fat wires are power, the 2 thin color wires are for the sending unit/dash gauge. The black is ground, black/white is power.

ITSWILL

iTrader: (12)

Ive got red/white, green/white, black and blue. The Black and the blue are thick while the other 2 are thin. I tested the red and the black together and got 12 volts. But the red and the green gave me zero volts.

Im thinking of running power directly to the fuel pump as a permanent solution.

Chris Boots

Just take the pump out and test the wires that would got to it. Next just test the pump it's self. If it's bad I know where you can get a 3rd gen pump for cheap and barely used. they are a drop in replacement. No modifications and they work great. As for the switch follow the wire to see where they go. Mazda never put just a toggle switch under the hood. There is how ever a switch that is connected to the latch but that goes to the security alarm. I'd need pictures to understand more of what you are talking about.

ITSWILL

iTrader: (12)

The switch is near the hood release under the dash. but i followed the wires and they dont appear to be going to anything so i dont know if it was for anything that used to go to the car or something that was aftermarket. but it doesnt really seem to matter to much.

ITSWILL

iTrader: (12)

Ok you say test the wires that go to it, do you meant test the continuity of each wire or are you talking about something else. Then you say just test the pump itself, what do you mean by that? Do you mean just put 12 volts to it and see if it runs?

Also if anyone knows the pin-out for the fuel pump connector that would be much appreciated.

ITSWILL

iTrader: (12)

ok i found a shop manual for this thing. It doesn't directly tell me what the pins on the connector are. But as far as i can see the wht/red is a low fuel light, the wht/green is for the fuel level, which leaves the black and the blue. I'm gunna take a wild guess and say the black is ground, which would leave the blue to be the power wire. I'm going to go test the connector but if anyone could confirm this it would be much appreciated.

ITSWILL

iTrader: (12)

ok the pump works. I put 12 volts to it and it worked. Tested the blue and black wires and got zero volts. So i guess im looking at a bad relay or something with the computer.

HAILERS

The large BLUE wire on the connector that connects to the fuel pump pigtail, is the power wire. ON the pigtail the color changes to black/white.

The wiring schematics clearly show the Blue wire going to the Fuel Pump Resistor Relay located behind the right fron thead light unit.

The ENGINE fuse powers the Circuit Opening Relay that sends power from the Circuit Opening Relay to the Fuel Pump Resistor Relay package.

See the free download of the wiring diagrams on this site. http://www.cochran-racing.com/FSM/index.html

Chris Boots

Yup, now just go through the basics of checking fuses and relays. I can e-mail you the section in my factory service manual that describes how to test the entire fuel system including the electrical part of it all. send me a pm with your e-mail address and I'll send it on over to ya. But ya It describes everything about the relays and wiring and such

ITSWILL

iTrader: (12)

i checked the fuel pump relay and it seemed to be switching just fine which tells me that the main relay is doing its job. I forgot to check voltage going in and out of the fuel pump relay will do that tomorrow. From the wiring diagrams it seems that that power that passes through the fuel pump relay comes though the red and blue wires which come through the circuit opening relay. I was going to test the circuit opening relay but i couldn't find the darned thing. I looked under the dash but i couldn't find it there.

Also how do you pm, do you have to have an msn account.

Thanks guys

Chris Boots

Have you jumped the test connector near your AFM? If I remember correctly you won't get any voltage to the pump until the engine senses air being drawn in through the AFM. anyway if you jump the connector (it will be a yellow connector) the pump will come one when you turn the key to on, not when the AFM tells it to. as for pm'ing someone, just click their name above their Avatar and it brings up a menu and you select "send a private message to __"

ITSWILL

iTrader: (12)

i jumped the test connector but nothing happened. I tested the voltage going into the fuel pump relay and resistor and found that i was only getting like .6 volts so now im moving on to the circuit opening relay. If anyone knows where it is i would appreciate a little help finding it i looked under the dash on the drivers side but i cannot find it.

ITSWILL

iTrader: (12)

ok that last post was invalid i forgot that i had taken out the fuses to test them so i will have to test that stuff again.

coolcustoms

it might be either a kill switch or maybe a valet switch

ITSWILL

iTrader: (12)

whats a valet switch?

Majesstyk

try flipping the amber switch

ITSWILL

iTrader: (12)

tried that, good idea though.

ITSWILL

iTrader: (12)

ok stuck the jumper in the test port and the fuel pump comes on when i turn the ignition on. What does that mean?