I was trying to get my 1980 280zx to start but the pump won't run. I"m not sure if it because there is only 4 volts where the pump hooks up to the electrical or if it is one of my relays. When I hook the fuel pump up to the battery it still doesn't run. Should I get a different fuel pump from one of my other 280zx's?

Thanks.

 

try to take it out and hitting it a few time their is sone time crap suck up in it

 

it's kinda a bad design how they just hang behind the rear end. I got my replacement for 100.00 at autozone, it's sdmaller than stock but it has a ruber sleeve included to make up the size. i'de just replace it. i mean heck it's at least 22 years old!

 

Ok I'm stuck. I have a working fuel pump and when I turn the ignition to the on position the pump should run. It still doesn't despite the working fuel pump. Like I mentioned before I only get 4 volts at the rear of the car to run the pump and it obviously isn't enough cuz it still doesn't work. What could it possibly be? I don't think it is the relays because I took them from my running 1980 280zx. Maybe one of the fusable links in the engine compartment? I don't really understand how you tell if they are good or not. anything would be great because I'm trying to get the car running so I can pull the motor and put it in one of my other 280zx's.

 

Never, ever use an autozone fuel pump... you'll be lucky if it lasts a year, and even if it does, it doesn't put out enough pressure. I just replaced the autozone POS I put in a year ago. I put the OEM pump in (which I got from napa for almost nothing). and all of my issues went away. Car runs like an animal again. If you scan through, you'll see that several others say the same thing about the cheap autozone pump.

Rod.

 

On the voltage thing i would check your grounds, connections for cleanliness, and your fuses. You could have residual volatge and have a blown fuse. Also make sure the connections to the fusible links are clean. I would use a wire brush or sand paper and clean them. If still having the same issue, hard wire the fuel pump to the battery and see if that fixes the issue. if so then you know you have a bad conncetion or a broke wire somewhere.

Good Luck

PS, I also dont recommend Autozone fuel Pumps, go with OEM or a modified on from MSA.

 

I checked my fuses and they are all good, the pump will pump out fuel when hooked to the battery. I found two broken wires that were supposed to be hooked to the fusable link box. I fixed them and now the volatage to my fuel pump is even lower. Now instead of getting 4 volts I only get 2.7 volts. I checked the connections and changed all the relays (with the exception of the one behind the glove box) they all click when you turn on the ignition and I didn't see any other connections. I traced the ground as far as it went (up behind the glove box) I pulled the glove box out and still the pump won't run. Thanks for all your suggestions so far.

 

hey...

my old pump ws just ah' hanging there by the hoses and i was puttion more fuel on the ground than in the motor.. worse yet the exaust was hanging and sparking from the ground.

i bought the pump and tools at a.z. and instaled it in their parking lot at 9:45pm with the store manager helping me.!!

say what you want.. but they get all my busness.

 

Just had the same problem with my 77. Try as I might I could not find the problem. I took it to a Z shop and he fixed it in no time which leads me to believe it was a resistor or something. Hes the type of guy who wont reveal his secrets so I cant be of any more help. By the way, I put in an Auto Zone pump and it seems to work fine. Good luck.

 

Check the forum on 3-3-25 for fuel pump relay.

 

This is what I've got... I hard wired the fuel pump so that I get fuel to the engine. Pump runs all the way to the fuel rail and back to the tank. None of my injectors are firing. Could the problem that is keeping the injectors from firing the same problem that won't run the fuel pump run? Any ideas? thanks

 

with some work I finally got the fuel pump to run. Actually all it took was me pulling one of the fuel pump relays.... Now that the pump runs the injectors still aren't firing. So Does anyone have any idea y the injectors aren't working??? Thanks

 

so
fuel pump running or not?
pressure regulator, a new one?
you should really get a pressure gauge and test the pressure after the pump, after the filter by the pressure regulator...

either your pump is dying and not pumping enough...or your regulator is stuck open and letting the fuel get by...

 

I was working on my 280zx and after a long time of it sitting cuz I gave up... I was trying to get it to start for the longest time and couldn't get it to even try to start. At first my fuel pump wouldn't run so I changed all the relays and it still wouldn't run. Then one day I pulled one of the fuel pump relays and the fuel pump started running I didn't understand it and disregarded it and left it out. I listened for the fuel and it ran around the fuel rail and never pressurized and went back to the tank . Knowing that I had fuel (sorta) I changed my resistors to ones out of a running car. Still didn't help, today when I decided to change the pressure regulator I hooked up the battery hit the throttle and turned it over and it barely started.

I changed the spark plugs, put the relay back in and turned it over and the car started. it would rev up but not idle due to a bad miss on one or more of the cylinders. When the car ran out of gas because the fuel pump stopped running (I put the relay back in shutting off the pump) I pulled out the relay and then tried to start the car..... Nothing plugged it back in and it started except now it dies when u touch the throttle. Now it idles and won't rev the opposite of before.

Has anyone had this problem before. I need my fuel pump to run and find out why it won't rev past 500 rpms.

Thanks for all the help so far

 

so you got it running...and its idling...but when you touch the gas...it kills the car..???

 

Have you checked the injectors? What about air/fuel ratio, that's why my ZX kept dying, I had to tweek the mix screw.
If this helps...cool...if not...sorry.

 

I checked and all the injectors are firing and when u touch the throttle it kills the car, but I'm glad I finally got it running. there is no air cleaner on it could this possibly help make it run better I think I read on one of the posts here that that lets in a bunch or unmetered air and makes the car run bad. but previous to that I had my silver z ran real rough with a filter on it--- I'll check the fuel air mixture tomorrow and then put the air cleaner on but I think the biggest problem is the fuel pump not running unless I pull the fuel pump relay but then the car won't start. So to get the car to start I need to plug it back in which cuts off the fuel any ideas? Thanks

 

I havn't done too much as far as wiring goes, but is it possible to rig it so your fuel pump relay is wired seperate from your ignition? i.e. a toggle switch to turn pump on and off.

Just a thought, don't know how plausible, or how exactly it would be done, just an idea for you to ponder on.

hope I can help somehow!

 

actualy that isn't a bad idea i had to do that to a datsun 200sx I had. ran for another 2 years that way then i sold it.

 

I was working on it today and I pulled the fuel rail to see if my injectors were firing but only two were firing so I pulled the fuel rail from a running car and still only two fired. when I got the car stated it was running on two cylinders and then at one point four. Now with only two injectors firing its getting frustrating! I need to get the head rebuilt for my other car thanks to all of it wonderful cracks so I'm gonna pull it soon if I can't get the car running.... Unless anyone has any ideas on why my fuel pump won't run with the relay plugged in and why my injectors won't fire let me know. I hard wired the fuel pump and it still didn't seem to work so maybe an electrical issue? Thanks!!!!

 

Double check the connections of the ecu harness to the computer. I don't know if n/a zxs have separate harnesses to the ecu, but on my zxt, there are 3 that plug into the computer. The top one is usually the most troublesome. Check to see that none of the pins are bent either. Use some electrical contact cleaner on both the pins and the harness.