How to change a fuel filter on a 1998 Mazda B4000

Mazda B4000 high mount light fuse location


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1998 mazda b4000 high mount light doesn't work. where is fuse located? not shown on manual.

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The high mount brake light fuse on a 1998 Mazda B4000 may not be shown in the owner's manual because it is often a shared circuit with other lights and accessories.

That being said, the fuse for the high mount brake light is typically located in the engine compartment fuse box or under the dashboard fuse box. Check your owner's manual for the exact location of the fuse box in your vehicle.

Once you locate the fuse box, look for a fuse labeled "STOP" or "CHMSL" (Center High Mount Stop Lamp) or "BRAKE" that is related to the high mount brake light. Use a fuse puller or needle-nose pliers to remove the fuse and check if it has blown.

If the fuse is blown, replace it with a new fuse of the same amperage rating. If the new fuse also blows, there may be an underlying issue with the wiring or the high mount brakelight assembly itself that will require further investigation by a qualified mechanic.

Test fuel pressure when key on/ engine off, and when running and compare to specs. Could be bad fuel pump, relay, regulator, gas cap, injector failing.

Could be catalytic con.?

Wouldn't you want to do some testing, to actually find a problem,
before you continue to install parts for no reason?

Do that--- test things

i would clean out tbe fuel tank and fuel lines, check for kinks.
Especially clean and test fuel pump and ensure all filters are clean.
May be an idea to clean throttle body too.

computer change

Take to an exhaust shop, check for plugged catalytic converter.

With it being an intermittant problem that indicates a possible electrical short. It's not likely that any parts would need to be changed. I hope this is helpful.

make sure your brake adjuster is backed all the way off then gently tap all the way around the back to remove

Driver side frame rail right where the door is. It's held in by a large hose clamp. It has 2 white plastic clips . 1 on each hose of the filter. When removing have a container that can hold gas ready because about a pint of gas will come out. Make sure new filter comes with new clips. I don't recommend using old ones. After new one in place turn key on and leave in run position for 20 seconds so filter can gill with fuel before starting and inspect fir leaks.