1985 rx7 gsl fuel relay
04-28-09, 07:34 PM
#1
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1985 rx7 gsl fuel relay
i purchased a first gen rx7 (12a) recently for a steal with a nice body and mint interior for because it wont start.
we checked compression. good.
spark. good.
fuel... not really working.
so, we bought the rx7 book, haynes manual anyways, and started on our way. since we are getting air and spark but the fuel pump wasnt pumping anything thats where we headed.
we found a coupler under the drivers compartment for the pump. we disconnected it there, ran the lines directly to an old battery pushing 10ish voltz, and it ran, and pumped fuel, at a considerable volume as well.
no, we know the pump works, sparks good, and compression is good. so we figure that there has to be a relay between the pump and the front of the car, and from what i have read so far, there is supposed to be one under the dash. problem is, the most the book does is give a wiring scematic, no picture or location.
google and this website have been incredibly detiled with certain builds when it comes to second gen and newer. for the life of us, we cant find a picture or a good description of where the relay is, or what it looks like.
any help would be greatly appreciated.
we checked compression. good.
spark. good.
fuel... not really working.
so, we bought the rx7 book, haynes manual anyways, and started on our way. since we are getting air and spark but the fuel pump wasnt pumping anything thats where we headed.
we found a coupler under the drivers compartment for the pump. we disconnected it there, ran the lines directly to an old battery pushing 10ish voltz, and it ran, and pumped fuel, at a considerable volume as well.
no, we know the pump works, sparks good, and compression is good. so we figure that there has to be a relay between the pump and the front of the car, and from what i have read so far, there is supposed to be one under the dash. problem is, the most the book does is give a wiring scematic, no picture or location.
google and this website have been incredibly detiled with certain builds when it comes to second gen and newer. for the life of us, we cant find a picture or a good description of where the relay is, or what it looks like.
any help would be greatly appreciated.
04-30-09, 06:43 PM
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whoa haha.. kinda forgot about this. took a while to get approved i guess.
anyways, a bit of progress.. we managed to find out what it looks like
however, the ability to test it leaves me a bit stumped.
here is a quote from a seperate writeup about the relay
now, i've heard i can go and buy a switch and bypass(?) the relay? is this is possible, and if so, how would it be wired?
anyways, a bit of progress.. we managed to find out what it looks like
however, the ability to test it leaves me a bit stumped.
here is a quote from a seperate writeup about the relay
Connector B-06...
The '84-'85 12A model RX-7s use a fuel cut relay to allow the rotary engine's ECU to control the fuel pump. The relay is located under the dash above the steering column, and has a 6 place connector with only 4 wires leading to it, identified as follows:
Black w/ a white stripe... these 2 wires provide 12v from a switched ignition source.
Blue w/ white stripe... this wire goes to the fuel pump.
Black w/ yellow stripe... this wire goes to the n terminal of the rotary's ECU, and needs to be grounded to make the relay energize the fuel pump. Although simple grounding of this terminal will make your fuel pump operate somewhat normally, We strongly recommend that you ground this terminal thru an oil pressure safety switch, so that the fuel pump will not continue to operate should the engine die, or in case of an accident.
The '84-'85 12A model RX-7s use a fuel cut relay to allow the rotary engine's ECU to control the fuel pump. The relay is located under the dash above the steering column, and has a 6 place connector with only 4 wires leading to it, identified as follows:
Black w/ a white stripe... these 2 wires provide 12v from a switched ignition source.
Blue w/ white stripe... this wire goes to the fuel pump.
Black w/ yellow stripe... this wire goes to the n terminal of the rotary's ECU, and needs to be grounded to make the relay energize the fuel pump. Although simple grounding of this terminal will make your fuel pump operate somewhat normally, We strongly recommend that you ground this terminal thru an oil pressure safety switch, so that the fuel pump will not continue to operate should the engine die, or in case of an accident.
05-01-09, 02:39 PM
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alright, along with a bump, i should elaborate.
i know that connecting a black 12v power wire and the blue wire that goes to the fuel pump to a switch will make it work, i should have been a little more informative with my question.
what i was actually wondering was, the extra blck power wire and the wire going to the ecu, do i just cap them, or should they be connected to each other as well? if i just cap them will anything be affected?
on another note, if i put a switch in and its no longer run through the ecu, will it always be at 12v (the pump)? from what i understand, the pump usually runs at 9v and adjusts up to 12v if required, but managed by the ecu. so if i connected it directly to the fuel pump, without the ecu determining the voltage will it have any ill effects?
i know that connecting a black 12v power wire and the blue wire that goes to the fuel pump to a switch will make it work, i should have been a little more informative with my question.
what i was actually wondering was, the extra blck power wire and the wire going to the ecu, do i just cap them, or should they be connected to each other as well? if i just cap them will anything be affected?
on another note, if i put a switch in and its no longer run through the ecu, will it always be at 12v (the pump)? from what i understand, the pump usually runs at 9v and adjusts up to 12v if required, but managed by the ecu. so if i connected it directly to the fuel pump, without the ecu determining the voltage will it have any ill effects?
05-02-09, 04:29 AM
#4
Lives on the Forum
First of all, check the fuse labeled "meter" and make sure it isn't blown.
When my relay went south, I used a jumper (simple piece of wire) between two of the contacts on that plug. Sorry, but I don't recall which two points I jumped. Now the pump turns on with the key.
Run a search in the 1st gen section, there are a few different writeups on bypassing the fuel pump relay, some with nice pictures....
When my relay went south, I used a jumper (simple piece of wire) between two of the contacts on that plug. Sorry, but I don't recall which two points I jumped. Now the pump turns on with the key.
Run a search in the 1st gen section, there are a few different writeups on bypassing the fuel pump relay, some with nice pictures....
03-12-16, 12:30 PM
#6
is this what you did. i had the switch on and touched these two contacts together and the gas pump started up.can i just get some male wire ends and just plug them in like that<br/>
