I recently had the fuel pump, fuel regulator and the fuel line replaced by a shop. Now, when I reach speeds of 55 mph, the truck begins to shake rather violently. It only lasts for a couple of seconds and will happen again and again as I accelerate beyond 55 mph. It seems to be ON the engine, not IN the engine, if this helps any. Other than this, the truck will operate great throughout acceleration and at a constant rate of speed, as long as I stay under 50 - 55 mph.
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Are you sure this is FRESH fuel? Or residual? Drain it and then turn key on to hear fuel pump prime the lines. There is a valve on the fuel rail to remove air in this line as well. Do you hear the pump? If so then most likely its your fuel regulator on the top rear area of the engine. IF you don't hear the pump -- TEST FUEL PUMP. Fuel injection needs a specific pressure (Constant pressure!)
Removing a tank installed fuel pump is tricky! You need a tool from GM. However, with PATIENCE, you can try to use two SMALL flat-head screwdrivers and CAREFULLY WORK THE METAL TABS AROUND THEN PLASTIC FUEL PUMP CONNECTIONS. Tank HAS TO BE lowered some to reach up and accomplish this.
I went through trouble shooting and spending my money on ALL the EXPERT shops suggestions. This was finally the cure!
my 1998 2500 sierra fuel pump has been replaced inside the fuel tank already,now a year later it's dying again when driving ,like it is not getting fuel at all! I have a 5.7L engine, is there a in line filter somewhere?
one common thing to check is the fuel pressure regulator. if its bad, it will cause hard starting (rich) take the vacuum line off the regulator, and see if fuel comes out of it, if so, replace the regulator.