no power to fuel pump

[tonytony]

I've narrowed it down to the relays but i want to make sure it might not be something else. I checked the wires and diagrams and im sure i wired the adapter right, i check the power at the relay slots and there's power. With the fuel pump relay in i check the fuse and no power. I take the fuel pump relay out and swap it with the starter relay and still nothing, i dont think the starter relay would be fried cause the car cranks with it. I take out the fuel pump relay and try to jump it, pins 87 and 30 of the relay and nothing happens, isn't it suppose to close and make a clicking sound? but the other two slots click when i put power to them(pins 85-86). I've tested the fuel pump and it works. I check my grounds and the ecu is getting power if that matters. TIA

tony

[KangamangusDriver]

You sure your ECU is not a silver label?

You need the Red/burgandy tagged ecu. I made that mistake and had the same problem

[tonytony]

Oh sorry, i forgot to mention it's a 92 non-vanos. I also check the plugs and there's power going into them.

[Mike B.]

You should hear a click when you turn the key and when you jumper the pins the pump should run.

Are you sure you have located pins 87 and 30 correctly? I made the mistake of holding the relay in front of me to identify the pins. Pin 30 is the top center, when you are able to read the numbers, but is the bottom center when you insert the relay into the holder. Just something to check.

Have you tried switching relays from the O2 sensor? They are interchangeable.

note: Silver 413 DME's will work as long as they are late '94 or older. I have a silver 413 DME with an engine build date of 2/93 and it works fine.

[tonytony]

I have the 402 ecu which came from the same car i got the engine off of. Pin 30 is not the top center i check, it's the middle left which is the power wire and pin 87 is the green/violet wire to the fuel pump. How would i jump the pins to see if the fuel pump gets power that way? I'm hoping it'st he relays but they seem to work

[Rocla]

How would i jump the pins to see if the fuel pump gets power that way? I'm hoping it'st he relays but they seem to work

Thick red should have constant +12.

Jump it to green/violet when relay is not in place, pump should roll as long as you keep wires jumped.

[tonytony]

how would i do that, stick a paper clip in it?

[Rocla]

how would i do that, stick a paper clip in it?

Clip will work fine, but do not use it for long, it might get hot.

EDIT: Check fuse 11.

[Mike B.]

I suppose the location would dependent on how you have the relay's mounted. ;)

For a jumper use two male spade connectors with a 15amp in-line fuse. You can even incorporate a toggle switch to turn things on and off.

[tonytony]

alright guys i just jumped the fuel pump relay slot and the pump comes on and the fuse gets power. It was the relay the whole time, i get how it could go bad though. thanks for all the help. If i get new relays and it still doens't start i'm gonna blow a gasket!

[Rocla]

You could try to fire it up with jumper wire in place of relay, everything else should work fine, if only the pump relay was broken.

[tonytony]

so i'm not going to fry anything else am i if i do that? What if the o2 relay was messed up would that keep the car from starting?

[tonytony]

problem wasn't the relay, it was a bad ground pin 86 or was it 85 it was which ever the ground is, so i grounded it and it starts up!!!!!!

[Rocla]

Are the colors of wires to realay

Red
Green/purple
Red/white
Brown/something?

That brown/something wire shouldn't be directly grounded, the car will work ok, but pump will be on allways when ignition is turned on(main relay is enaged).

The red/white feeds scwithcing +12 from main realy to pump relay, and AFAIK the brown/something grounds(via ecu? someone with schematic please check) the relay when pump is supposed to pump.

I've run to this problem earlier, but can't remember whats the solution, grounding that brown/somthing however will make your car driveable.

[Mike B.]

The brown/green wire (teminal 85) is supposed to go to pin 1 on the DME (function - fuel pump relay control).

This enables the DME to shut down the pump if there is trouble with the fuel system. For example, if the injectors aren't firing, the pump shuts down.