9rider Posted February 3, 2014 Share Posted February 3, 2014 I turned key to all the way off position and still hear my fuel pump humming, verified , FPG went all way to 42psi. Check afm flap all good. Limitted internet cant aearch more. Nothing swap or done recently beside a bad alternator , wont charge below 1500 rpm. Everything run good till now , have to take off battery post . pressure cause leak in my fuel line . Thanks Quote Link to comment Share on other sites More sharing options...
m1ghtymaxXx Posted February 3, 2014 Share Posted February 3, 2014 (edited) What year is your car? I had the same issue, the fuel pump relay under the dash would stick. The double relay in my 77 can be bought from MSA for around a $100, but I just unbolted mine and gave it a few smacks and it unstuck. Once every couple months it sticks again so I've just left it unbolted so I can reach down and give it a tap if need be. Edit: here's the double relay from MSA: http://www.thezstore.com/page/TZS/PROD/classic17b12d/11-3470 And the single relay: http://www.rockauto.com/catalog/x,carcode,1209260,parttype,3380 Edited February 3, 2014 by m1ghtymaxXx Quote Link to comment Share on other sites More sharing options...
9rider Posted February 3, 2014 Author Share Posted February 3, 2014 I have 1976 280z. I will try to do as you said. Thanks a lot. Quote Link to comment Share on other sites More sharing options...
NewZed Posted February 3, 2014 Share Posted February 3, 2014 The pump running with the key off will not change your fuel pressure. The 42 psi has nothing to do with the relay. And if your lines leak at 42 psi that's a separate problem. They should hold up to 60-90 psi easily. You can pop the holders on the side of the relay cover and take it apart if you decide that you have a sticking relay. And if the relay is stuck then the AAR circuit should have power too. Might be an easy way to get another clue. Quote Link to comment Share on other sites More sharing options...
9rider Posted February 4, 2014 Author Share Posted February 4, 2014 Do you think problem caused by my bad alternator? I am planning putin 240sx alternator this week. Fuel leak at the straps because i use the old ones. Thanks guys. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted February 5, 2014 Share Posted February 5, 2014 Probably not caused by alternator, and I would figure out this problem before you put the alternator in and add to the confusion. What do you mean fuel leaking at the straps? Quote Link to comment Share on other sites More sharing options...
m1ghtymaxXx Posted February 5, 2014 Share Posted February 5, 2014 Fuel pumps are wires specifically to fail safe (off), There aren't many points of failure that will cause the pump to run on. The relay is a great easy way to start, and the FSM has pin by pin instructions on how to test it. You're fuel leak won't be caused by a running pump, however having it pressurized all the time will certainly highlight any leaks. Quote Link to comment Share on other sites More sharing options...
9rider Posted February 6, 2014 Author Share Posted February 6, 2014 Fuel leak where I connect my fuel pressure gauge. Not a big deal I can tight it up. I left my car and using another car to drove back , not daring driving wife and me with car having fuel problem. I will go up there and see what happen. Thanks guy. Quote Link to comment Share on other sites More sharing options...
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