Question about 1999 GMC Yukon Denali
I BOUT A 99 DENALI IT PRETTY BUT THE FUEL PUMP IS GOING OUT? SO WE HAVE TO BEAT ON THE TANK TO CRANK IT AND THE I GOT ON THE INTERSTATE AND IT WOULDNT GO OVER 60 MILES PER HOUR IT WAS LIKE IT WASNT GETTING GAS WHAT DO I DO
Change the fuel filter first, it could just be a bad filter. Most of the time if the Fuel Pump go's bad the Engine will not run since there is not enough fuel pressure for the injectors to run.
A dirt fuel filter will still have fuel pressure but not the proper fuel rate. When you buy the Fuel filter at the parts store, like Auto Zone or Parts Source (they scan for free) if the truck can make it there, have it scanned for any DTC codes to see if there are any other problems that may be causing the problem like a bad Fuel pressure regulator or another sensors that may have gone bad making the truck do what it's doing.
The other thing to, Look for any corrosion at the Fuel Pump harness from the frame to the tank. See if there is any damage to the wire's and connection clips. But if your going to have to change the Fuel Pump, change the harness too. The extra $12.00 for the harness is cheaper then dropping the gas tank again just to change at 12 inch wire harness.
Good luck and hope this help. PS don't trash the old Fuel sending unit. You can always drill out the old Pump from the unit and replace it with a more reliable pump.
Posted on May 08, 2009
Yes, it does sound like your fuel pump may be going bad.
The first thing I would try is to change the fuel filter. If the fuel filter is plugged, it will cause a low fuel pressure and the engine will not run good.
After you change the fuel filter you will want to do a "fuel pressure" test. You can borrow a fuel pressure gauge or but one ( $40 US ) connect it to the fuel rail test port on the engine and start the truck. Your fuel pressure should be 45 to 55 lbs.
If you have more questions, let me know.
Posted on May 08, 2009
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Posted on Jan 02, 2017
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