Hi: I have a 1996 Chevrolet Silverado with a 5.7L Vortec. A few years ago it simply quit running while I was driving down the freeway at 70 mph. I had to have it towed to a shop to get it repaired because I was 400 miles from home. The mechanic told me he replaced the FP30 fuel pulse dampener located on the fuel sending unit. Everything worked fine after that. (I replaced the fuel pump and filter two years previously.) Question 1: What exactly does the dampener do that would cause a loss of fuel pressure? My understanding is that the pressure regulator should be responsible for pressure while the dampener simply 'smooths' out the pressure by eliminating the pulses. Question 2: Why are there pulses in the first place? I'm assuming the electric fuel pump produces a relatively steady rate of pressure, so are the pulses due to the injectors operating? Thank you in advance!