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I had the engine and front end redone a couple of years ago and noticed that when I drove it for the first time that I could hear the fuel pump. It seemed loud and I don't remember hearing it from my memory of 20+ years ago. The first question I have is whether I should be able to hear it when in the driver's seat? If not, is that a sign that I should replace it? It has been maJJking this noise for over 2 years and I drive it about 10-15 miles a week. I then noticed a couple of weeks ago that as I got on the highway to go 60-70 mph and put it under some load that it started hesitating. I backed off and got it back to the garage and it was idling fine. My second incident happened a week ago as I was in third gear traveling at 35-45. It was really stumbling badly. I shifted to 4 th gear and put it under some load and it stumbled again. I backed off the throttle (below 2000 rpm) and got it back to the garage. Yesterday, I had it out and traveled no more than 40-45 mph and noticed no such instance as above, but I did keep the rpm below 2200 or so. Does this sound like an electric fuel pump problem? When a fuel pump goes bad, does it go bad all at once or does it go in stages some times? Would 100 LL fuel be a problem to run? I usually mix it with pump gas ethanol free. Any insight would be appreciated. Regards, JJ 75 280Z
