where is the relay for changing fuel filter , so i can cut off pressure in the lines, the writing is worn on the fuse boxes under hood!!???

Asked by May 30, 2014 at 10:48 PM about the 1989 Nissan Pulsar NX SE Hatchback

Question type: Maintenance & Repair

2 Answers

114,245

Ok just pulling the relay will not de pressurize the fuel line. If unsure of which one I would un hook the battery. Then carefully and slowly loosen the lines to the fuel filter. When you see gas start to come out stop loosening it for a few seconds. This will allow the pressure to be bled off. Now slowly and carefully continue removing the lines and filter. Remember to position body so that the gas will not get on you and also wear safety glasses. Hope this helps.

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100,445

removing the relay is not necessary to change the fuel filter, just make the ignition is off, better yet have the keys in your pocket, there will be some fuel loss due to residual pressure when you crack open the lines but that is normal, make sure you replace the little copper washers also or you could have a fuel leak afterwards, after the new filter is in place, cycle the key a few times to reprime the system and recheck for fuel leaks, if it's all good then start engine.

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