I just replaced the fuel pump 600 miles ago. On the interstate only i would be running 75-80 mph and all of a sudden I would lose rpm and if i put the petal to the floor nothing would happen. I could only ease into the throttle and get up to speed. If I turn the truck off and then back on its fine for 15-20 min and then the problem returns. That was last night. This morning i go out side to go to work. Start the truck, starts just fine out it into reverse truck dies. Again, truck dies. I put the truck in Nuetral and start I had to give it gas to run, then brought it to idel put into reverse truck died and now no power anywhere. No dash light no power locks nothing? Im so lost
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General advice:After warming up track the problem:sparkplugs (even new can have the ceramic parts broken/cracked /wiring (after warming up the isolation get's soft,can loose spark power)/ignition coil(s) (gets hot,stop runnig),running reach,fuel pump/fuel pump relay.Best guess:fuel pump mallfunction (low pressure) related,fuel filter cloged/water in the fuel/fuel line cloged/chipped. Cheers,hope u figure it out,let the people know.
How about water or dirt in the gas? It sounds like when the tank gets low this happens, so you need to check the tank out and make sure you are not getting watered down gas. This is very common and would cause the symptoms you are describing. I have a 98 Z28, so let me know if there is anything more I can help you with.
I had a similar problem @105k. I had changed the fuel filter but it was still sending all kinds of codes that were related to 2 problems. Long story short, the main problem was a bad trigger assembly in the distributor (rough running) and the other was a loose engine to body ground (engine code issue). Good luck, this worked for me, now 171k.
I would change your fuel filter, if that doesn't do it check your fuel pressure with a gauge at your schrader this is a pretty simple test if you are not getting enough pressure, then test your fuel pressure regulator, if it's bad replace it. if it's good got to your fuel pump, I am assuming you don't have or even know what a DSO is, so if you traced it to a fuel pump, take it to an auto technican and ask them to do a fuel current ramping test and this will tell you your fuel pump rpm's most of todays properly operating fuel pumps spin from at least 4000 rpm to 6500 rpm. happy motoring!