240Z dies-- help!
08-14-2002, 07:12 PM
#1
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240Z dies-- help!
Hey guys-- this one is tough... first I need to explain what it is-- its a '71 240Z, with an L28 FI in it--- stock fuel lines, FI fuel pump, stock fuel tank.
If I start it, it will run and idle--- rev, just fine--- sitting in the driveway. If I take off, I'll get about 4 houses away and it dies. The pump sounds different, and you can't hear the gas from the fuel return line going back into the tank. I can pop the hood and disconnect the fuel inlet line to the fuel rail on the engine, and let some gas spill out, re-connect it (while the pump is running) and then a second later you'll hear the fuel going back into the tank, and it will run.
Today I disconnected the lines on the engine and on the tank, and ran 100 psi of air through the lines both ways, and drove it and it only gets a few houses away. Last week when I drove it (I haven't touched it since last week), I could drive it for about 10 minutes before it dies. SO now I figured its the tank, so I took out the tank and took it to my radiator guy to have it cleaned, he inspected it and said cleaning it would be a waste because its clean already--- I looked in also and really it was really clean. SO I put it back--- same crap-- 2 houses and it dies-- starves for fuel, and you can't hear the fuel returning back to the tank.
Any ideas you guys? do you think it might be my fuel pressure regulator? This engine was running perfectly a couple months ago in a '76 280z--- and I have the fuel pump from the same car--- MAN I'd really like to drive it now!
Any advice appreciated--- thanks in advance!
-Steve
http://hometown.aol.com/stev240z
If I start it, it will run and idle--- rev, just fine--- sitting in the driveway. If I take off, I'll get about 4 houses away and it dies. The pump sounds different, and you can't hear the gas from the fuel return line going back into the tank. I can pop the hood and disconnect the fuel inlet line to the fuel rail on the engine, and let some gas spill out, re-connect it (while the pump is running) and then a second later you'll hear the fuel going back into the tank, and it will run.
Today I disconnected the lines on the engine and on the tank, and ran 100 psi of air through the lines both ways, and drove it and it only gets a few houses away. Last week when I drove it (I haven't touched it since last week), I could drive it for about 10 minutes before it dies. SO now I figured its the tank, so I took out the tank and took it to my radiator guy to have it cleaned, he inspected it and said cleaning it would be a waste because its clean already--- I looked in also and really it was really clean. SO I put it back--- same crap-- 2 houses and it dies-- starves for fuel, and you can't hear the fuel returning back to the tank.
Any ideas you guys? do you think it might be my fuel pressure regulator? This engine was running perfectly a couple months ago in a '76 280z--- and I have the fuel pump from the same car--- MAN I'd really like to drive it now!
Any advice appreciated--- thanks in advance!
-Steve
http://hometown.aol.com/stev240z
08-15-2002, 11:21 AM
#2
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Re: 240Z dies-- help!
08-15-2002, 10:44 PM
#4
Externally Wastegated
Join Date: Oct 2001
Location: San Diego
Posts: 1,220
Re: 240Z dies-- help!
Is the fuel tank from the 240 or the fuel injected one? Just wondering because the stock carbed tank will not provide you the necessary baffling to keep your car fueled up while running. The fuel injected tanks from an early 280z will work, or so I've heard to cure the problem if that's what it is. Anyway, good luck and I hope you solved the problem.
82ZXT
82ZXT
08-15-2002, 11:41 PM
#5
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Re: 240Z dies-- help!
By the sound of it, it seems to be heat related (or can you allow it to idle till it gets hot?) I'm not sure, but this is what it soundsw like. Perhaps the pump is over heating, or some wires are shorting or something. I just throwing out ideas here, i'm not really sure what it could be.
Alan, Australia
Alan, Australia
08-16-2002, 06:29 AM
#6
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Re: 240Z dies-- help!
You said your fuel pump is working when you pull the lines. Check and see how much fuel pressure you have. It sounds like the car is starved for fuel. Your fuel pump may work when it's not trying to push against anything (i.e. when you pull the line) but fails when there is pressure built up (i.e. when you reattach the line). If these are diaphragm type fuel pump (which I believe they are) all it would take is a small hole to cause the problem you're talking about.
Keep the greasy side down.
-Mo
Keep the greasy side down.
-Mo
08-16-2002, 05:10 PM
#7
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Re: 240Z dies-- help!
i have a 1982zx not sure if they r the same type of gule system but mine did the same thing that yours it doing come to find out it was a burnt ground weire i would check all the wieres around there to see if they cam losse or are burnt
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