No power to excite fuel pump relay 1987 300zx turbo

That circuit usually includes these possible components:
A/C Control Module
Body integrated unit
Light control sensor
Transmission Control Module
Engine Control Module
Fuel pump relay
Ignition coil No. 1 (turbo model)
Ignition coil No. 2 (turbo model)
Ignition coil No. 3 (turbo model)
Ignition coil No. 4 (turbo model)

If it takes a minute to blow the fuse then definitely one of components in list is causing too much amperage. try a slightly larger fuse.

I suspect the fuel pump circuit is drawing to much power. Do you have something else hooked into those wires(Audio equip?) The fuse is there to protect the relay. Have you put a bigger fuse (bigger number) in there to keep it from blowing the fuse? If not I suspect a bad fuel pump or a stuck fuel pressure regulator(Causing the pump to work too hard- drawing more electrical power) Just remember, its hard to put the smoke back in once it catches fire.

Find the fuel pump relay and see if it still has a power feed. I hope you didn't hurt the computer with battery on backwards, but that is a possibility.
Pull the fuel pump relay, and check all the terminals it plugs into with a test light or voltmeter. One terminal should have power. It should be hot at all times. If nothing trace the power supply from battery to that relay. A fuse or fusible link may have gone out. If it does have power, check at the fuel tank for power on the pump wire when the engine is cranking. If power there, likely the pump is gone. If no power signal when cranking the engine, it's back to the relay to check the fuel pump circuit. You will have to see a wiring diagram.

The primary (coils) side of the fuel pump relay is powered by the CRANK fuse (10 Amp) located in the instrument panel fuse block. This fuse is hot ONLY when the ignition switch is in the CRANK position. The secondary (contact) side of the relay is powered by the ECM-B fuse (20 Amp) which is hot at all times. This fuse is located in the engine compartment fuse block. The electric fuel pump in the tank only operates during engine cranking.

Hi,
if there is no power coming out from the relay, that will be the problem. as you said it is new,check it manually by connecting the terminal into the power source and check the continuity of the the output from the source.
Sometimes there is new parts that has a manufacturer defect. try another relay.

Hope that helps you out!

The power supplied to the fuel pump, ignition coil, fuel injectors, and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.

The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, or if the turbo boost pressure reaches and exceeds the over boost cut-off point, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module. This causes the engine to shut down.

Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

First try a new fuel filter and check your air filter. Sometimes the ignition relay on those is intermittent too. You may want to check the timing also. It is ok to ****** the timing a couple of degrees and see if it runs better. The turbos on those cars can have issues too. take care and good luck.

Is the inertia fuel shut off switch tripped ?

have you checked all fuses under the hood? have you checked the fuel pump relay? you may be able to swap the fuel pump relay with amother relay in the fuse box.are you getting power into and out of the reset switch? from there it goes to the fuel pump. if power is getting to the fuel pump and it has a good ground, the the pump is bad.

Look in the fuse box under the hood. Find fuse "ECM B" which is on circuit 120 which excites the fuel pump relay. This is the fuse you want to inspect. The relay pin next to it is controlled by the PCM. The other 2 pins on the relay control the pump and the other the prime circuit.