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WHERE IS THE FUEL PUMP RELAY?!?!?!?


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#1 patra_is_here

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Posted 02 January 2008 - 07:07 PM

86 esir

i'm looking in the service manual right now, but, in case i can't find it, someone where might know.





#2 UlrichWolf

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Posted 02 January 2008 - 07:15 PM

Technically, there isn't one.

However, I believe what might point you in the correct direction, is the "main relay" located above the ECU.

Tim
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#3 patra_is_here

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Posted 02 January 2008 - 07:21 PM

well, looking at the wiring diagram, there's definitely some sort of relay in line with the fuel pump. is the main relay a large relay, with say, maybe 8 wires?

#4 UlrichWolf

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Posted 02 January 2008 - 07:23 PM

Yeah, it's got a lot of connections on it.

Tim
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#5 patra_is_here

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Posted 02 January 2008 - 07:36 PM

thanks homie!

#6 Truth

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Posted 02 January 2008 - 08:53 PM

i thought the fuel pump relay was the two-wired relay near the 5 a/c relays on the bracket above the coil?
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#7 Dad

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Posted 02 January 2008 - 08:55 PM

Just above the ECU


If I'm right  do I get a prize?

Dad

#8 JAinsworth

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Posted 02 January 2008 - 09:04 PM

QUOTE (Dad)
Just above the ECU


If I'm right  do I get a prize?

Dad


Not from me biggrin.gif   But I will agree with your answer.....but...are you smarter than a 5th grader :shock:

Jimmy

#9 indy_85stariones

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Posted 02 January 2008 - 10:29 PM

QUOTE (UlrichWolf)
Technically, there isn't one.

However, I believe what might point you in the correct direction, is the "main relay" located above the ECU.

Tim


The "main relay" has two circuits...
1)  one to provide power for injectors
2)  the other, to provide power to fuel pump
(note - unlike most japanese 80's cars, our "relay" doesn't provide power to the fuel pump when key is in "ON" position.  It waits until key is in "START" position before providing power to fuel pump.  Usually our cars won't start on the first cranking attempt, because it takes some time for our fuel pressure to build up.)




#10 randomguy

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Posted 03 January 2008 - 02:07 AM

orly on my FIP i hooked it up to the golden thing behind/under the glove compartment (what i thought was the fuel pump relay lol)

it worked lol
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#11 Indiana

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Posted 03 January 2008 - 02:26 AM

the fuel pump relay is half of the control relay







BW-black/white stripe   01 / (+) output / turns on the Fuel Pump when starter is cranking or engine is running

WR-white/red stripe     02 / (-)  input / signal from ECU to activate fuel pump relay after

                                              ign. switch moves from "start" position and engine is running

BR-black/red stripe      03 / (+) output / when ignition "on", this sends power to the injectors

B  -black                     04 / (-)  grounded to body

BY-black/yellow stripe   06 / (+) input / from ign. switch "start" position

                                              this activates a relay that turns on the fuel pump

R  -red                        05 / (+) output / when ignition "on", this powers the ECU

L  -blue                       08 / (+) input / from ign. switch "on" position

                                              this activates a relay that powers the ECU and the injectors

B  -black                     07 / (+) input / fuse link back to Battery positive terminal

#12 patra_is_here

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Posted 03 January 2008 - 11:38 AM

thanks indiana! my wiring diagram had different colored wires listed, so, that pic really helped clarify.

#13 chasm2530

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Posted 03 January 2008 - 01:49 PM

QUOTE (JAinsworth)
QUOTE (Dad)
Just above the ECU


If I'm right  do I get a prize?

Dad


Not from me biggrin.gif   But I will agree with your answer.....but...are you smarter than a 5th grader :shock:

Jimmy

I won a million dollars on the "Are You Smarter Than a 5th Grader" home version...where's my check?
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#14 DJpowerHaus

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Posted 03 January 2008 - 04:41 PM

Nice post!  I always wanted to know what was inside of that Main Relay.

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#15 Force_Feed1988

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Posted 03 January 2008 - 04:47 PM

That relay right there caused about 2 days of heart ace for me. I unplugged it when changing the ECU, and the relay got pushed under the seat. For 2 Days I tried to get my car to run. I was getting no Spark or Fuel! After switching between ECU's dozens of times I realized There was something missing. After I found it, I Plugged that bad boy in and it started right up.

#16 dj_justice

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Posted 18 April 2008 - 01:38 PM

QUOTE (Force_Feed1988 @ Jan 3 2008, 05:47 PM) <{POST_SNAPBACK}>
That relay right there caused about 2 days of heart ace for me. I unplugged it when changing the ECU, and the relay got pushed under the seat. For 2 Days I tried to get my car to run. I was getting no Spark or Fuel! After switching between ECU's dozens of times I realized There was something missing. After I found it, I Plugged that bad boy in and it started right up.


Im having a problem with my new fuel pump cutting out then coming back on then cutting out again. Could the relay be the culprit?
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