Fuel Pump

[Guest]

On my 96GT do I need the wiring loom connected to get fuel through the lines or is my ecu on the way out?

[dubbedup]

um...not sure if im on the right track but you need power and earth to make the pump work. Is does not need to go thru the ecu. Have you blown a pump?

[leggyfreak]

where r ya i got a fuel u can try if you want?

[Guest]

It was brand spankers, just been sitting unused for 2yrs, oh yea don't report me to the RSPCA or nothing.... but my wifes cat hahaha got locked up in it for 3 days LMAO

[Guest]

 leggyfreak said:

where r ya i got a fuel u can try if you want?

Im on the outskirts of Blenheim...

[leggyfreak]

oh thats a bit fair

[Guest]

I will get the one out of my GTB.... but how do you relieve the pressure??? Dissconnect the fuel pump plug and run it for 30sec?

[dubbedup]

undo it at the filter end- alhto you way sounds much less messy....

[Guest]

 dubbedup said:

undo it at the filter end- alhto you way sounds much less messy....

Ok I will give it ago my way, I did it the way you suggest in the w/end, gas all over the engine before start up :

[Guest]

Ok so we all know.... my way didn't work.... so much for thinking lol

[Guest]

Changed fuel pumps over and still no go

I have got power in the male plug so it has to be something else.... maybe there is a solenoid somewhere..... up in the passengers side under the dash???

Calling all experts!!!!!

[nztintin]

do you have a multimeter to test the output of the plugs going to the pump?

[Guest]

Have I ever

[dubbedup]

run a temp positive off the battry and a temp neg and see if it primes...if so you know there is a prob in the system.

[nztintin]

so you have 12v between pins? if you have that is HAS to run if the pumps good!

[Guest]

Yea I got a 12v on 1 wire but no gas

[dubbedup]

put a earth on the other

[Guest]

 dubbedup said:

put a earth on the other

I got 4 other wires to choose from....

would it be the black 1 ???

[dubbedup]

um Im not sure, but for mine to work we needed to hard wire 12v and a earth for it to run, also check the plug under the rear seat as these tend to get cooked and dont work

[Guest]

Ok will do

Anyone know of a fuel solenoid?

Or maybe a fuse somewhere?

But if the plug has power.... ahhhh for sucks fake

[spark_38]

Relay is bolted to RH firewall above steering column, there will be either 2 or 3 relays - it is the round green one with two thin wires (relay input) and two thick wires (to fuel pump), from memory it is the one in the middle.

4 wires at the plug end (under back seat) two thin wires for fuel level (variable resistor by float), two thick wires for fuel pump power: usually black with either red or yellow stripe (+12V), black (ground)

the factory fuel pump relays hardly fail, you can rewire your own relay to the pump via the ignition switch (on whn in the IGN posn). pumps draw about 4A so no need to rewire using 8-gauge wire, i found 12-gauge more than sufficient.

[log1call]

I thought you said you took a hose off under the bonnet and fuel went everywhere... that means you have fuel pressure surely?

The other thing is... you do realise the fuel pump only gets turned on for a second when you turn the key to start, then if the motor isn't running the ecu turns the pump back off again... You did know that right? And when you were checking for power with your gauge you were turning the key off and on? If you turned the key on, then got in the back and found twelve volts then you found the fuel gauges power supply, not the pumps.

[Guest]

 log1call']

I thought you said you took a hose off under the bonnet and fuel went everywhere... that means you have fuel pressure surely?

Read again.... I was referring to my GTB which got a engine replacement not the GT in question. So thats what you get for thinking.

The other thing is... you do realise the fuel pump only gets turned on for a second when you turn the key to start, then if the motor isn't running the ecu turns the pump back off again... You did know that right?

Further to the point... you do know that I had all the fuel hoses off.... which means the fuel pump should keep on pumping gas huh.... you did know that aye?

[quote name='log1call said:

And when you were checking for power with your gauge you were turning the key off and on? If you turned the key on, then got in the back and found twelve volts then you found the fuel gauges power supply, not the pumps.

Didn't use a guage used a multimeter but you already knew that.

Anyway desipte all the sarcasim thanks for the advice

[Guest]

 BATATTACK said:

On my 96GT do I need the wiring loom connected to get fuel through the lines or is my ecu on the way out?

OMFG the answer is YES.

[log1call]

Ha Bat, you do have a bad attitude.

The fuel pump does not cut off due to pressure, it's timed by the ecu.

A multimeter or an analouge guage is still a gauge.

My reading abilities, well they are not really worth your sarcasm.

The fact you needed to ask the first question reveals a certain level of ignorance. Your responce reveals an even greater ignorance.

I wasn't being sacrastic Bat, I was offering suggestions, suggestions that I see you needed, but have chosen to ridicule instead. I see from your reply that you do not understand the basic principles of electrical theory. I see that you do knot know how the systems on theses cars work.

Good luck with it... and any other future problems you may have.