Chevy suberuban 96vortec 5.7 fuel system trouble. replaced pump,emc fues,fixed wires bye block that burned. still wont start. does anyone know what else it could be?

WHAT DOES WORK ? WHEN YOU WASH DOWN ENGINE YOU NEED TO COVER/WRAP/ ENCLOSE ELECTRICAL ITEMS !!! COIL, ALTERNATOR, DISTRIBUTOR, CONTROL MODULES, ETC., OTHERWISE, YOU'VE GROUNDED OUT YOUR ELECTRICAL SYSTEM !!! USE COMPRESSED AIR TO BLOW OUT ALL MOISTURE FROM THESE ITEMS MENTIONED. POWER FOR FUEL PUMP SYSTEM COMES FROM BATTERY, TO A JUNCTION BLOCK TERMINAL, WHICH HAS FUSIBLE LINKS WHICH ACT LIKE FUSES,, TO PROTECT EACH SYSTEM . DON'T KNOW IF THATS YOUR PROBLEM , BUT STRANGER THINGS HAVE HAPPENED ! FUSIBLE LINK LOOKS LIKE A HEAVY GAGE WIRE, BUT COULD BE A SINGLE STRAND OF WIRE INSIDE INSULATION ! NEED TO BE REPLACED IN LIKENESS !!! YOUR VEHICLE NEEDS TO DRY OUT ! MAYBE I'M ALL WET ? BUT CHANCES FAVOR THE PREPARED MIND !!! YOU NEED TO UNDO WHAT YOU DID , MAKES SENCE, YES ? ITS WHEN YOUR PROBLEM CAME TO BE ! OTHERWISE, INSPECT EVERY WIRE IN THE FUEL PUMP CIRCUIT, ESPECIALLY THE GROUND WIRES !!! THEY ARE JUST AS IMPORTANT AS THE POWER WIRES, WITH OUT QUESTION ! YOUR RELAY GOT BACKSPLASHED LOOK HOW MANY WIRES GO THERE ! IT ALSO HAS ITS OWN FUSE. THINK I COVERED IT, GOOD LUCK , YOU JUST MIGHT FIX THE PROBLEM AND NOT REALIZE IT TILL IT STARTS !

possible

Things to check
Plugs;
Remove the spark plugs and read them, they should all have a dry tip and be clean from any carbon, oil or fuel.
Usually if burning fuel properly they will have a brown or whitish looking tint from burned carbon.

If any of the plugs look wet or black or dirty looking different from the others the problem is with that cylinder, change all the plugs and see if that helps, the next lease expensive thing is replacing the plug wires.If your fouling plugs ask your parts store for 1 number hotter plug ( heat range)

Plug Wires;
Open the hood at night with the engine running and see if you find any blue looking arcing around or in the wires, if so replace the wires.

Fuel Injectors
If all above looks good your fuel injectors might be dirty or one might not be working. You could try an injector cleaner mixed in with your gas

A rough idle comes from one or more cylinders not firing as hard as the others or not at all, there are so many causes for this so you have to troubleshoot with the lease expensive fix first.

Another thing is water in the gas, you can pour plain ole rubbing alcohol in your gas tank if you suspect water in your gas. alcohol mixes with the water and makes it burn instead of mis firing.

Valves
One more thing that can cause rough idle is your valves, this requires a compression check on each cylinder. If one cylinder has less compression than the rest remove the compression tester and squirt some engine oil in the cylinder then re test, if the compression increases it is bad rings or a bad cylinder bore, if not it is a valve problem.

Oil seals around the piston increasing the compression temporarily while testing but makes no difference in testing if the valves are leaking.

Good Luck,... troubleshooting and patience, or a good mechanic is the solution if you are working with neither

The fuel filter may be to dirty to let the gas flow through and will need to be replaced, or most common when you run out of gas is the fuel pump will burn it self out. The fuel in the tank will keep the fuel pump cooled and will keep it from burning out, if you ran it out of gas. The pump may have burn out and will need to be replaced. Check the fuse first and hope the fuse blown due to the extra amp drown from the pump running without fuel. If the fuse is good, then check to see if you can hear the fuel pump start up when you turn the ignition key to the run position. Note the fuel pump will only energize the fuel line for 5 seconds, so you need to listen for the pump to turn on right away. The other thing too, is you can check the fuel pressure at the shredder valve, there should be 62 to 65 PSI when energizing the fuel line and will drop around 5 PSI when the engine is running. Make sure you do not try to start the engine by pouring gas down the throttle body, it been know for the gas to catch fire in the intake manifold and burn up the fuel injector system which is very costly. Start with the simple and check the fuses and fuel pump, then replace the fuel filter. At worst, your going to have to replace the fuel pump by dropping the gas tank and don't forget to replace the wire harness from the fuel pump to the frame. Good luck and hope this helps, keep me posted. Be glad to know you got your Blazer running again soon.

did you check power and ground at the fuel pump connector?there should be power at two wires at the connector,one should have constant power with the key on and thats for your fuel gage,the other power wire should have it only when cranking or for about 3-5 seconds when the key is turned on,check both of those first and that will let you know that everything is fine all the way forward of that connector,also did u replace just the pump or the whole sending unit?if you just replaced the pump the connector that runs fron the sending unit to the actual pump itself inside the tank also goes bad on this setup too,look for brown or burn marks on the inside of the sending unit where this connector hooks uo,hope this helps

ARE YOU USING THE RIGHT BOLTAGE FUSE FOR THE FUEL PUMP

check the fuel pressure regulator and also the emc fuse

can you here the pump run? if so check the emc fuse and some do have a fuel pump fuse also the fuelpressure regulator could be bad!!!!

that red wire is a test lead to jumper the fuel pump to test it.if ecmb fuse keeps blowing my guess is your ecm has a short in it,in that case it can be purchased at oreillys

its real simple your crankshaft sensor is bad you need to replace it , the cost of the sensor is about $40 your problem will be solved.