fuel pump relay in ga70

[Hash_ra23]

Hey guys just a quick one....

wheres the fuel pump relay and fuel pump resistor located in a ga70 supra. I found the Circuit opening relay in the passenger kick panel but cant find the fpr.

thanks.

[wilbo666]

I think it is in the engine bay, drivers side strut tower sort of location...

Cheers
Wilbo

[Kyosho]

Drivers side strut top.

It's a brownish sorta colour, and it's bolted to a resistor, which, I'm 99% sure is the resistor for the FP

[Hash_ra23]

is that the one there? with the resistor?


damn, i ruled them out cos the wiring colours differed from my wiring diagram. oh well.

thanks for that guys!

[wilbo666]

That's the one!

The bit with the fins is the resistor of course and the other part is the relay

Wiring diagram colours are usually little help! They always seem to be different!

Cheers
Wilbo

[SillyCarS]

so should i be mounting the high pressure pump in the engine bay then?

[Kyosho]

No, in the petrol tank.

[wilbo666]

so should i be mounting the high pressure pump in the engine bay then?

Wha? What does that have to do with this conversation?! lol

I don't see why you'd want to do that....

High pressure pumps generally don't like sucking, that is why they are mounted near the tank...

Cheers
Wilbo

[SillyCarS]

sorry, i shouldve said, im doing the same conversion as hash and im also in the process of wiring up my fuel pumps

why the f*ck is it in the engine bay then?

[wilbo666]

sorry, i shouldve said, im doing the same conversion as hash and im also in the process of wiring up my fuel pumps

why the f*ck is it in the engine bay then?

The fuel pump resistor is well different to the fuel pump, my guess as to why it is in the engine bay is that its an easy spot for it!

Main connections to the fuel pump resistor are:
*Fuel pump
*Battery via COR
*ECU Trigger (low / high)

If the fuel pump resistor was at the pump then the battery and ECU trigger wires would have to be longer....and that'd be silly! So I guess they put it as close to the battery as was easy

Edit: Meh it has to double back from the COR, but to me it'd make more sense if the COR was in the engine bay with the other relays!

I've no idea what conversion you're doing, it was never mentioned, but what is wrong with leaving the fuel pump in the tank as it is from factory?

Cheers
Wilbo

[Kyosho]

That relay also powers the AFM, oxygen sensor, IAC, and FPU.
That's why it's in the engine bay.

[Hash_ra23]

thanks for the confirmation

i wouldve thought a better location for it would be next to the circuit opening relay tho....

[wilbo666]

That relay also powers the AFM, oxygen sensor, IAC, and FPU.
That's why it's in the engine bay.

Ah you sure about that....

thanks for the confirmation

i wouldve thought a better location for it would be next to the circuit opening relay tho....

Too big and too hot would be must suggestions as to why it isn't

Cheers
Wilbo

[Hash_ra23]

ahh so is it a bad idea to put it under the dash somewhere in the ra23? Thats where i was thinkin of putting it, i didnt know it heated up but that explains the hardcore looking resistor

and no the fpr doesnt power those things kyosho....

[wilbo666]

kyosho might have got confused with the Main EFI Relay?...


As for heat, lets say the Fuel pump draws 6A at 12V (the resistance of the fuel pump is 2Ohms... in this example... )

Now when we add the fuel pump resistor inline we get a total resistance of 2.7Ohms -> 4.44A now, and we have 4.44A * 4.44A * 0.7Ohms = 13W (P=I^2 R) of power being dissipated in the resistor...

13W might not sound like that much, but meh

Cheers
Wilbo