I have 1989.5 RHD 300zx and the fuel pump is not working what is the colors on the wires at the pump to by pass it?

 

lol To bypass what? What good would bypassing the pump do? lol

It's probably the fuel pump control unit - they're known to fry themselves from time to time on early Z32s. Check for voltage at the pump with the key in the 'on' position. If there is none, the FPCU is the likely culprit.

 

Or you could check the FPCU itself. How to find it is detailed in here:
http://www.ttxtz.com/tech/fp/index.html

If you take the cover off, it'll be clear as day if it's bad... there'll be a burnt section. Tried to find an old photo for you, but couldn't find it quickly and I'm not on my computer to get it myself.

 

Scratch that... forgot I had it saved online.

 

I took my test light and hooked it up to ground in the trunk and on the blue wire it lights up and on another wire it has a weak light.

is there a way to hook the pump up to a switch for on or off?

 

Like hook the pump up to the battery and run a toggle switch to turn it on or off??

my pump isnt where the pictures are showing mine is a 1989 but its the z32 style its under the spare tire in the middle of the trunk.

 

Also i bought my car with 2 ECU's and the guy said it needed an ecu so do i have to get a certain one for my vg30dett motor? and i looked at my FPCU and it is not burnt or nothing so its good but the pump is still not working.

 

That just means your car is a 2+2, no big deal.

You cannot wire the pump itself directly to a toggle switch, because it is a multi-speed pump (hence the purpose of the FPCU - which you still need to inspect). You could wire the ground to a toggle switch to act as a kill to prevent theft, but it would not resolve your current issues.

Inspect the fuel pump control unit and respond with its status. If it is blown, you need to replace it (and you could wire the control unit to a toggle switch, if you so choose). If it's fine, we need to consider other causes.

 

I inspected the unit and it is not blown there is no sign of any burning in it

 

Your fuel pump is probably blown. It happens.

I suspected this was the case after I thought about it for a bit (but I chose to disconnect from the internet last evening, so my apologies for the delay). If you were getting power (at all) at the pump, the FPCU was probably fine. The reason it has two positives is for the multi-speed functionality of the pump (NA pumps are two speed, TT are three speed, and the voltage coming from each of the wires is what controls the pump's speed). This also explains why you had a weak electrical signal on one of the wires - since the engine isn't under heavy load (the engine was presumably off), the fuel pump control unit is basically setting the pump to the lower speed setting.

 

So my fuel pump is not good?
i should change out the pump then and see if it works?

 

does the EFI harness have to be fully connected for it to work? because its not connected also does the ecu have to be connected?

 

lol

Why the hell are you worrying about your fuel pump if your car doesn't even run? When I was finishing my 240Z L28ET swap, the fuel pump is literally the LAST thing I did. Get everything connected and THEN worry about it.

This whole thread is now dumb.

With that said, the EFI harness doesn't need to be connected, but my understanding of the electrical system yesterday would've been that the ECU needed to be connected for the FPCU to determine which setting to use... the fact that your pump was getting power suggests that understanding was likely wrong, and also that your pump is still probably dead.

 

I have another issue, my eng cont fuse blows everytime i turn the key to the on position??

 

You have an electrical short... find it, fix it. What did you expect me to say?

 

I found it and i just rewired it back to the ECU.
Under the hood there is a little fuse block with 6 fuses in it one says fuel pump and a big blue one says BATT and ect.
everybody says my relay is behind the drivers side kick panel but what would that fuse or relay be?

Thank you for the replies

 

Fuse box is by the driver's side kick panel, fuel pump relay is under the hood by the battery.

 

Relay is inside the car behind the drivers side foot panel. Remove the panel and the relay is green, under the hood release handle, in that area.

Fuse is in the engine bay infront of the battery.

 

Here's a picture.

 

My mistake. Thanks for checking in, Woody.

 

I thank everyone in advance for replying,

I am in the middle of pulling my engine out of the car to replace some parts, does anybody know if i can pull the motor out with the transmission still attached to the engine??

 

You can, but I say it's far more difficult. Why would you want to do it that way, anyway? Dropping the transmission isn't the end of the world...