My 99 sierra quit while driving, i turned the key on and off, i could not here the fuel pump engaging, so i put a new fuel pump, still the pump does not run.fuses are good.do you have any solutions?

Something wrong in the fuse box if you only have .4 volts at the fuse. Maybe a loose terminal in there.

I've actually had this happen to me more than once, with different pumps. Quite honestly, the first time it happened, I gave up and bought a new pump. The new pump I got was an Airtex, which out of the box, it worked whenever it wanted to, and this time, I found out why. The main electrical connector, on top of the pump, if it was "bumped" or "moved" a certain way, it would cut off all power to the pump. Weird, I know. Needless to say, that pump got returned, went with a different brand, and never had that problem again.

I had the same problem and to my understanding blazers are known for their fuel pumps going out. You might hear the fuel pump engage but that doesn't mean it is putting out enough fuel pressure to keep the engine running. Your best bet is to have it towed to a local shop and let them run a pressure test to check and see if your getting enough fuel pressure or if your a big do it yourself type you can rent a pressure tester from auto zone or your local auto parts store. If you don't want to do that you can get a fuel pump for around 3 to 4 hundred dollars and replace it and see if that cures the problem.

There should be no clicking sound coming out of fuel pump, if it's still running fuel pump is getting ready to go out on you, replace it,hope this was very helpful.

Hi,

Many big and small things can cause this, but i think it's something like a ecu failure, ignition failure, a short-circuit...

contact your local tecnician to point it out, or a specialist maybe, cause its too hard to just say what it can be caused by.

I hope this is useful, and greets,

Olivier.

I has an 86 Mustang that did a similar thing and it turned out that the battery actually shorted out. This happens when one of the plates inside the battery brakes off and then touches another plate. When mine died it was like I turned the iginition off. It wouldn't turn over even with jumper cables.

check fuel pump relay, is fuel present at motor 

check electric fuel pump operation ( located in the fuel tank ). Occasionally a fuel pump will burn out when running out of fuel, due to the fact the pump runs DRY for about 30 seconds till the fuel stops flowing out of the injectors, the engine quits, simultainously losing oil pressure which FINALLY shuts off the fuel pump. Sometimes TOO LATE. Hope this helps

I see you say that you have a new fuel filter but did you try replacing the fuel pump??? If not you can check the fuel pump simply by turning the key to the ACC position (thats as far as you can turn the key WITHOUT starting the truck) listen by where you pump the gas in and try to hear a low sounding whine if you cant hear it then it could be your fuel pump is dead and needs a new one....or it might be going dead.

If its fuel related, it is most likely the fuel pump inside your tank. You can listen for it by having someone turn the key to on (not start) while you listen by the fuel tank. You should hear a buzzing sound for about 5 seconds. That means the pump is turning but is not really a good indication of pump pressure.
If you don't hear the pump run, I would check power to the pump first before you buy one. I think the whole tank unit is about $150.
Good luck