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Mozi · Oct 27, 2008, 05:44 PM

Hello, Help!
When I got this car I was told it needed a new fuel pump. It would run intermittently.
So I got a new pump installed it, and realized I was getting any power at all back to it.. so, I checked the fuses all good, dropped the tank and traced the wiring all seems good. Cleaned the connections to the pump.. I was told it could possibly be the Fuel Pump Relay.. So I replaced that.. nope. Nothing.

Im stumped.
Car runs great if I put a bit of gas into the carb.. but that's not going to get me around town :)

Help?

TxGreaseMonkey · Oct 27, 2008, 06:26 PM

Here's what you need to do:

https://www.askmehelpdesk.com/cars-t...ml#post1245523

Mozi · Oct 27, 2008, 06:45 PM

Thank you

Mozi · Oct 28, 2008, 10:21 PM

Fuses are all good, Pump is new.. Im going to try to refuse to accept the possibility that it's the ECM.

Where is the carburated LX models Main Relay, I can't find it where its supposed to be..

TxGreaseMonkey · Oct 29, 2008, 07:39 AM

Left kick panel, just above hood release.

Mozi · Oct 29, 2008, 10:29 PM

LX Model doesn't have a main relay.

Ive been told it could be the coil/cap/rotor if coil is going out can distort crank signal to pump relay? Causing to start on pump

What do you think?

Mozi · Oct 29, 2008, 10:46 PM

Well at least the main relay is the fuel pump relay which is at the back of the fuse box

TxGreaseMonkey · Oct 30, 2008, 07:13 AM

. The coil, cap, rotor has nothing to do with the performance of the main relay. There is no crank signal to the pump relay.

. Clean the main ECM ground on the thermostat housing.

. Perform the K-Test on your ECM--it may be bad.

Does the Check Engine Light stay on, when the ignition switch is turned to ON (Position II)?

Mozi · Oct 30, 2008, 10:00 AM

No CEL turns off as normal after a few seconds

Mozi · Oct 30, 2008, 10:01 AM

Already cleaned main ECM ground

TxGreaseMonkey · Oct 30, 2008, 10:05 AM

When you jump Terminals 5 and 7 in the main relay connector, does the fuel pump run?

Mozi · Oct 30, 2008, 11:36 AM

That's what I'm trying right now then ill try the ecu test you have posted.

I don't think I have a jumper, can I rig something up with a fuse and two wires ? :) 15 a right?

Mozi · Oct 30, 2008, 11:55 AM

Actually, the check engine light on 86 is that the blinking of the doors and headlights diagram a couple times then it turns off.

Im not seeing an actual "Check Engine".. like most cars have

Mozi · Oct 30, 2008, 12:27 PM

Did K-test reads 5 volts.

Mozi · Oct 30, 2008, 12:44 PM

On iatn net someone said something about ignition coil not being OEM and it causing problems with electrical system to pump.. upon further investigation I've noticed that the ignition coil under the hood has yellow scribbles on it as if salvaged from a junk yard..

Though why would the car run intermittently when I first bought it now no power at all to the pump.

Mozi · Oct 30, 2008, 01:35 PM

If I jump Term 1 and 2 from Fuel Pump Relay behind fuse box pump runs. Ended up just ghetto riggin a jump wire with a 15 a fuse.

Mozi · Oct 30, 2008, 03:36 PM

According to a post on iatn

The blue
Wire on the ignition coil has to have dwell to send a signal
To the fuel pump relay to let it know to turn on the fuel
Pump.

Mozi · Nov 1, 2008, 07:23 PM

Ignition coil didn't change anything

kharl_prado · Nov 8, 2010, 02:26 AM

Hi Mozi, how did you fix the fuel pump problem? I'm having the very same problem with my 1990 Nissan A31 Cefiro (carbureted engine, electric fuel pump in fuel tank).