KingBennon20

Good morning

Im having trouble with my fuel pump. Its on a 92 fd3s. Im not getting any gas to the engine. I took the fuel pump out and gave it a tap still nothing.
Would anyone know where the fuel pump relay is?
Or have a picture of where it is. That would be great!
When I get home I'm going to try the stock ECU. Instead of the fc commander

Thanks!

KingBennon20

Not sure what to do now...
#1 took out pump and put it on a 12v. and it worked
#2 installed it back in. And tested it again from the out side. And it worked.
#3 Tested the wires from the pump to the front of the car to make sure there was no break. Still ok
#4 Check the relay switch. Hooked meter and 12v. Heard click and have resistance. ok
#5 Took wires off to the pump hooked meter up and started. Seem to have really low voltage. 3v
#6 Replaced ECU from a'pexi to stock ECU. still no go

Everytime I start the car you dont hear the fuel pump start. And when cranking I dont see any pressure on the fuel gauge.

So im not sure what to do. I've tried everything I know. Anyone have any input.
Thanks

KingBennon20

Does the circit relay provide power to the fuel pump?
Maybe that's my problem

azhonkie

Check your manual and see if the Maf sensor turns on the fuel pump when it opens.

Turbo Cole

What happens when you connect the ground and fuel pump terminals of the diagnosis connector and turn the ignition switch on?
Can you hear the fuel pump?

KingBennon20

Ya I did the jump in the terminal. That didnt turn on the fuel pump. I also ordered a new walbro 400 LPH fuel pump. The old one still works but I need to upgrade it anyways.
So I the diagnoses terminal doesn't turn on the pump, what does that mean?
And the circit relay works also.

Turbo Cole

I'm fairly new to this and I have no idea how to get pictures on here, which makes things hard to explain. There are places online where you download the entire manual.
Fuel pumps are on page F-100
I would check the fuel pump relay and the fuel pump resistor.
If the circuit opening relay is OK and the fuel pump is OK and the wiring is OK,it could only be the fuel pump relay or the fuel pump resistor.
The fuel pump relay may explain the low voltage reading you had, since it controls the fuel pump operational voltage.
Hope this helps.

NeoTuri

iTrader: (2)

I had a bad connection in my relay box which would intermittently turn off the fuel pump on hard left turns. At first, I believed it was fuel starvation from a bad pump or what not and replaced the pump with a Walbro 255lph. I also kept more than 1/4 tank of gas during auto-x, but the problem wouldn't go away.

I wasn't able to figure out what was going on, until I bypassed the fuel pump relay and hardwired the pump directly to the battery. Since my battery relocation, I eliminated the relay and hooked the pump up to run at full voltage. In a few weeks though, a new relay circuit will go back in near the pump.

KingBennon20

Ya im going to be doing the hardwire when i get the walbro 400lph pump, its jump getting shipped right now.
If I do that will I no longer need the circuit relay for this in the front of the car?

Like it show in this image


What i dont understand, the black and the white/red wires.
It says 85 black for black wire and 86 white. for white/red wire
Do those wires not go back to the old fuel relay?
So it will still rely on the old fuel relay and circuit relay to work. ????

KingBennon20

Hey sorry about the really big pics. It would let me shrink it anymore, or you wouldn't be able to read any writing.