1986 BMW 318i;Turns over but engine wont run.I'm getting fire to my fuel pump but no fuel to the engine.When I spray starter fluid over the carburator it runs until the fluid runs out and then stops.So I dont know if its the fuel pump ,fuel filter or fuel pump relay fuse/switch.
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have you measured the voltage @ the fuel pump or are assuming it has no power because it's not turning on? with that age of vehicle it could be corrosion of the electrical connectors. You really need to measure the voltage at the fuel pump to ensure no power is getting to it. If it has power, then likely the fuel pump sender unit (replace entire mechanism), if no power, then likely corrosion of the connectors.
basic thing need to be check, are you getting sparks and fuel. no spark, can be bad coil,rotor, distributor and sensor. no fuel, can be fuse, relay, fuel pump or sensor. The car need to things to fire and run, that's gas and fuel..check those first and see what happens.
You will need to check for fuel pressure or dirty filter. If you do not have fuel pressure; be sure to check fuses or any relay pertaining to fuel pump (if electric). If fuses and relays are good check or replace fuel filter. If the fuel pump is mechanical disregard fuses & relays and check or replace fuel filter. If this does not resolve the problem then the problem could be the fuel pump if mechanical, If its an electric fuel pump it could be a fuel pressure regulator, fuel pump, crimped fuel line or other wiring issue.
These are the most common things I run across, oh, a crimped fuel line can cause the problem in either case electric or mechanical. Hope this helps in some way, been awhile sense I worked with an older car.