fuel pump cutoff relay
#16
Originally Posted by PKRWUD
Okay, let me try and set it up for you. First, remember that the yellow wire always has battery voltage because it goes to the starter relay post that connects to the battery pos post. When you turn the key on, the ECM energizes the fuel pump relay through the red and the tan/green wires. It then closes the relay, connecting battery power (the yellow wire) to the inertia switch. If the inertia switch is closed (meaning it hasn't been tripped in an accident), power then continues on to the fuel pump. get it?
#19
I want him to look at the two relays he said are there for the fuel pump, and tell us what color the wires are going to them. That way we can tell him which of the two is really the fuel pump relay, and then by checking the schematics, try and identify what the other relay (that he thinks is for the fuel pump) really is.
*edit*
And no, neither of these are for a '95. Like I said, the first image is from the '86 schematic, and the second image is from the '87 schematic.
*edit*
And no, neither of these are for a '95. Like I said, the first image is from the '86 schematic, and the second image is from the '87 schematic.
Last edited by PKRWUD; 03-25-2006 at 11:52 PM.
#20
Originally Posted by PKRWUD
I want him to look at the two relays he said are there for the fuel pump, and tell us what color the wires are going to them. That way we can tell him which of the two is really the fuel pump relay, and then by checking the schematics, try and identify what the other relay (that he thinks is for the fuel pump) really is.
OR
a cutoff relay that goes to an inertia switch to goes to ONE bigger size relay that can handle TWO fuel pumps.
OR
a cutoff relay that goes to an inertia switch that goes to a fuel pump with another wire from the inertia switch that energizes another relay to drive the extra fuel pump. (which is ONE inertia switch and TWO relays).
Last edited by temp1; 03-25-2006 at 11:57 PM.
#21
Originally Posted by temp1
LOL, this is so funny. I did not even notice I was looking at threads posted by two different people. I thought I was replying to racer all this time. Now I see he said three different relays and the inertial switch is not really a relay, its a switch. Im thinking he has TWO fuel pump relays and TWO fuel pumps which are energized by ONE fuel cutoff relay. (He might really have THREE relays). A cutoff relay that goes to an inertia switch that energizes the TWO fuel pump relays.
He doesn't. I'm telling you, bro, the systems are virtually identical. The only real difference is the color of one wire and the official name of the relay. In 1986, there was no item called a "fuel pump relay" installed anywhere in the truck, only a "fuel pump cutoff relay". In 1987, they changed the name to "fuel pump relay", and have called it that ever since.
#22
Originally Posted by PKRWUD
He doesn't. I'm telling you, bro, the systems are virtually identical. The only real difference is the color of one wire and the official name of the relay. In 1986, there was no item called a "fuel pump relay" installed anywhere in the truck, only a "fuel pump cutoff relay". In 1987, they changed the name to "fuel pump relay", and have called it that ever since.
#23
Alright guys, I got the colors of the wires.
The relay that is mounted under the dash on the side of the EEC first.....
it has four wires they are: white/blue strip
yellow
black
lt blue (fuse link)
the relay that I found under the hood has four wires they are:
tan/black
tan/green
red
yellow
I have a diagram of my system but I can't get it to paste so you can see it.
The relay that is mounted under the dash on the side of the EEC first.....
it has four wires they are: white/blue strip
yellow
black
lt blue (fuse link)
the relay that I found under the hood has four wires they are:
tan/black
tan/green
red
yellow
I have a diagram of my system but I can't get it to paste so you can see it.
#24
Originally Posted by racer88
Alright guys, I got the colors of the wires.
The relay that is mounted under the dash on the side of the EEC first.....
it has four wires they are: white/blue strip
yellow
black
lt blue (fuse link)
The relay that is mounted under the dash on the side of the EEC first.....
it has four wires they are: white/blue strip
yellow
black
lt blue (fuse link)
Originally Posted by racer88
the relay that I found under the hood has four wires they are:
tan/black
tan/green
red
yellow
tan/black
tan/green
red
yellow
#25
#27
#28
Originally Posted by racer88
Then I replaced the wrong one. I put the fuel pump relay that I bought where the EEC power relay is. Why are they the same type of plug?
NEVER MIND.
The relays are all 12 volts and if they handle aproximately the same current on the contacts then its not really a big deal provided that the terminal positions for the coil and contacts are identical. Go get a new EEC power relay and put the fuel pump relay where it belongs.
You should be good to go then.
Last edited by temp1; 03-26-2006 at 10:53 AM.
#29
#30