1986 nissan d21 v6 3.0 new fuel pump but wont turn on checked the pump relay and replaced it an i have current but wont travel to the fuel pump????? Do i need to rewire the cables to the pump

IF ITS FUEL INJECTED CHANGE THE SPYDER. OTHERWISE YOUR PROBLEM IS FUEL COMPONNENT RELATED INCLUDING A BAD 02 SENSOR THAT MAY NOT BE REGISTERING BECAUSE YOU HAVE A FAULTY CHECK ENGINE LIGHT. TAKE IT TO AUTOZONE AND HAVE THEM CHECK IT EVENTHOUGH THE LIIGHT ISN'T ON

FUEL PUMP RELAY 1987 Nissan/Datsun Truck D21 Truck 2WD 2.4L FI 4cyl The Fuel Pump Relay is located: Under hood, passenger side, front engine area, rear of headlight housing, mounted on upper fenderwell

Hi, First thing to check is the fuses that may be problem. If the fuse is okay then check for the fuel pump relay fittings. Please leave me feedback thanks, Malcolm Campbell.

a oil gauge reading maybe delayed until car starts and builds good oil press.Did you check for spark
was car running good before this happened? Do you have a rpm reading when cranking car?

Vapor lock? That might happen in a diesel engine, but I have never seen that in a gas engine.

It is more likely there is something obstructing the flow of fuel from the tank to the pump. That is not a very long distance to travel considering the pump is in the tank. This "over-working" can cause the pump to draw too much power tripping relays/breakers.

Just because the pump was replaced doesn't mean it is not bad. An obstruction could have also damaged the new pump if it is not a manufacturing defect.

I do understand that Nissan parts are kind of expensive and I would have the pump replaced just on principle since it is probably still under warranty.

I have seen a few similar situation with residual gas tank contaminants (sugar) damaging pumps. (fluid pumps tend to burn up when they don't have a liquid to cool the internal components) No flow is very bad for the life of a pump.

Furthermore, if such vapor lock does exist and can easily be bled off by relieving pressure from the last injector in the series. (gasoline fuel injectors are different from diesel injectors, so trapped air is typically forced through the system without any priming necessary)

check fuses inside truck . If any dought change it cause sometimes they are hard to tell. I have a 1986 nissan hardbody 4x4 myself.Buy yourself a haines manuel cause the fuel system is pretty weird . good luck i stop by and check out the nissan questions everyday,almost.

all lights stay on dont turn off

fuel pump and fuel sock is bad replace them but first replace the fuel filter, it's located driverside on the inside of frame rail under door.

Fuel pump may be getting weak. If pressure is not high enough the injectors wont open.

Check the ignition coil and the fuel pump relay.