280Zen Posted January 6, 2004 Share Posted January 6, 2004 I'm having a strange problem with my 83 zx NA. Over the past couple months while driving I will hear the fuel pump start whining, just a little then get louder till the engine will cough and stall out. If I let the engine cool down it will drive fine for awhile. At first this only happened during a long highway drive after about 1 hour the car would show these symptoms. Recently this same thing has happened during in town heavy traffic driving (Hot days). The Injectors are new, The fuel filter is new, The fuel pump is 1 year old, the fuel rail has been pulled and cleaned, the tank dropped and checked for gunk, the sending unit pulled and the screen checked for blockage. Any Ideas?? Quote Link to comment Share on other sites More sharing options...
Tim240z Posted January 6, 2004 Share Posted January 6, 2004 Sounds to me like the fuel pump is being starved for fuel. Double check the lines. Also, you may be getting vapor lock in the lines. Are your fuel lines protected from the heat of the engine? Try wrapping them in some heat shielding tape. Tim Quote Link to comment Share on other sites More sharing options...
280Zen Posted January 6, 2004 Author Share Posted January 6, 2004 One thing I will try is putting a fuel pressure gauge on the car, then wait for this problem to show up again. Someone suggested that the vacume line for the pressure regulator could be leaking and cause pressure build up in the fuel line???? Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted January 25, 2004 Share Posted January 25, 2004 rust or dirt in tank or something to plug up tank pick up.fuel pump will get louder when it is pulling a vacuem. Quote Link to comment Share on other sites More sharing options...
280Zen Posted January 25, 2004 Author Share Posted January 25, 2004 I've pulled the sending unit out, visual inspection doesn't show any dirt or rust in the tank, but that doesn't mean theres not a bit in there still clogging up the line. I will be dropping the tank soon and taking a look at the pump to see whats going on. Thanks for the info. Quote Link to comment Share on other sites More sharing options...
280zrice Posted February 1, 2004 Share Posted February 1, 2004 also do a current ramp with a low amp probe on a multmeter. it should show you tral time working of the pump, it it ramps too high under load change it Quote Link to comment Share on other sites More sharing options...
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