I have put 3 new airtech pumps in and they develop a high pitch sound after only a couple of days and then stop working all together. I replaced the fuel filter, the wire harness and cleaned and wiped out the tank to remove all debris. Any idea why these pumps would continue to go bad?
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WELL MOST BOBCATS NOW HAVE ELECTRIC FUEL PUMPS NOW , SO REPRIMEING FILTER IS EASY YOU JUST KEEP CYCLING KEY (NOT TO START) WHEN FILTER IS PRIMED (NOTED IN PITCH CHANGE OF FUEL PUMP SOUND) THEN YOU CAN LOOSEN ONE INJECTOR SUPPLY PIPE (NOT REMOVE) TILL A HINT OF FUEL DRIPS OUT OF IT , CRANK ENGINE TILL IT TRYS TO START , THEN STOP AND TIGHTEN THE INJECTOR PIPE , THEN START NORMALLY ALLOW TO RUN FOR A FEW MINUTES BEFORE RESTORING TO SEVERVACE EVERYTHING
CAUTION : AS WITH ANY DIESEL THEY USE VERY HIGH PRESSURE PUMPS TO INJECT FUEL INTO ENGINE ALLWAYS KEEP EXPOSED SKIN AWAY AND SHIELD FACE/EYES WHEN WORKING ON THIS FUEL CAN AN WILL ENTER YOUR SKIN AND CAUSE YOU FATAL PROBLEMS !!!! SEEK MEDICAL HELP RIGHT AWAY IF FUEL ENTERS YOUR BODY !!!
Could be a plugged fuel filter; very old gas (car has been sitting unused for some time) has pasted through fuel filter and clogged it. Fuel pump in gas tank is weak and the electric motor in fuel pump runs, gets hot and stops. Have someone listen behind the back bumper away from muffler. The sound of a fuel pump can be heard close to the underside of fuel tank (high pitch whine). If the sound stops before the car dies...that would indicate a faulty fuel pump.
Fuel pump in the tank makes a high pitch sound which is normal. Turn your key in the ignition, but don't start, you should hear the high pitch sound with the pump priming the system. You will still hear it when started, it's annoying but normal. Different brands are quieter than other, I just replaced mine with a Delphi brand fuel pump which is a tad quieter than AC Delco stock pump.
Sounds like the ground is bad. The ground wire for the fuel pump is located on top of the frame inder the place where the fuel filler hoses go over the frame to the side of the bed where the filler cap is. Some models this wire gfoes to the transmission crossmember( I can't tell you why) and are on the top side. this wire ( it's black and by it's self) can be nearby but in other places. It can be just dirty or broken off or if the old pump failed shorted burnt off. One wire on the pump should be grond and the other comes from the fuel pump relay in the under hood fuse real panel. (It;s marked) You can turn on the key before you put the pump in the tank and it'll whine as you turn the key on. Airtex makes some poor pumps but I bet you did'nt get three bad ones. I put Delphi pumps in and don't even tell my customersw that you can get the cheap Airtex as I don't like having to change them againin less than a year.
Could be the electric fuel pump if so equipped. What area(s) of the car the the fuse control, that should give you a hint. Some cars have a fuel pump system that the pump kicks on and off to keep proper fuel pressure up in the fuel lines. If not working right will run battery down in a few days.
check the egr valve it sound to me that its stuck open and if this happens excessive exaust gases are flooding the intake or you might have a vacuum leak either one of these problems will make a high pitch sound