I have a 1993 mazda b2600i. The fuel pump randomly shuts off. Repaced fuel pump shut off relay lines cleaned tank. Once it shuts off cant even get it turn on when bypassing fuel cutoff relay.

Faulty fuel pump or fuel pump relay. Locate the fuel pump relay. Remove it. And turn the key on again. Check if fuse is holding.

Crankshaft sensor

Hi Miguel, The link below is a short youtube video showing how to test and fix a car that shuts off randomly, Hope this helps.....CHEERS..


Fixing Car That Shuts Off Randomly

clean out charcoal box filter and try to blow line out from charcoal box to fuel tank with low air pressure from a air compressor

sounds like an electrical problem .pump isnt coming on .turn on key listen for fuel pump to come on for 10 seconds then shut off on its own. If you dont hear the pump then its probley fuel relay . next check wires are plugged into fuel pump. lots of cleaning ?? is the fuel rail screen plugged ???? disconnect before rail if the pump comes on next. turn on key check for fuel pumping out line .

its in the drivers side kick panel on the left corner... single relay by itself

wrong vacuum line hooked to fuel regulator

i'm assuming you disconnected the fuel line and placed the line in a container to catch the fuel when observing the flow.

it might sound strange but i think there might be a leak in the tank coming from the fuel pump assembly. it's possible a tube or hose is broken on the assembly and the pump is just pumping the gas back into the tank.

there's flow because there is no pressure building up with the line disconnectedand the gas flows. when connected, pressure builds and blows out the break in the tube or hose.

Order the fuel pump for your car.

you should check the pressure in the fuel lines going to your carb. or fuel injector and if pressure is good that would mean the relays are still doing there job