MkS30 Posted November 9, 2011 Share Posted November 9, 2011 (edited) So my early production 260z sputtered out and stalled on the way to school about a week ago. After searching the forums and looking in the FSM I was almost positive it was the Mechanical fuel pump that had malfunctioned. So after replacing it today, with an Airtex mechanical fuel pump, the z started up, drove, parked, turned off, and started again and drove. Everything a car should do. Yet after about 10 minutes of driving back from school, I was losing power, and it seemed like the same problem as last time. But the pumps only a few hours old, so I thought perhaps it vapor locked. ....It didn't. I'm not getting fuel to engine again. Even after an hour or two of sitting the car won't start. So I think vapor locking can be ruled out. Is it possible that the mechanical pump is faulty? (again) Any input would be greatly appreciated. -Matthew K. Edited November 9, 2011 by MkS30 Quote Link to comment Share on other sites More sharing options...
jasper Posted November 10, 2011 Share Posted November 10, 2011 What is the HISTORY on the car?? Which carbs? ETC. Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 10, 2011 Share Posted November 10, 2011 Are you sure the carbs aren't getting fuel? Have you confirmed no/low fuel flow? 74 is the first year of the electronic ignition in the domestic Zs. You might look there also. They tend to sputter and die when they get old and hot, then rejuvenate when they cool off. Quote Link to comment Share on other sites More sharing options...
19762802+2 Posted November 10, 2011 Share Posted November 10, 2011 I was having similar problems on my 260z. check your electrical fuel pump in the rear by the tank. Quote Link to comment Share on other sites More sharing options...
MkS30 Posted November 10, 2011 Author Share Posted November 10, 2011 Okay here's some more information that will help. The car was a daily driver into the mid 80's, and remained a heated garage queen into the late 80's. Then the car was taken down for quite some time and was rebuilt. Its got: Round Top SU's (I believe from a 1970 240z) Rubberized Gas tank inside and out Rebuilt engine - the only thing that wasn't done was that the block wasn't boiled. And since I've gotten the car i have replaced/done: New fuel filter New coil New wires New plugs New cap New rotor And the mechanical fuel pump was replaced yesterday. But may have been faulty. Now as for the electric pump being bad, it might well be but (to the best of my knowledge from searching the forums and reading the FSM) it is not necessary for the car to run, or even start. It doesn't kick on until 400rpm, so starting the car is directly reliant on the mech. pump. I haven't confirmed low/no fuel, but the carbs seem to be operational, and the engine can run on starter fluid (but then of course dies after it burns the little amount of starter fluid is depleted.) Any critique, ideas, anything helpful is welcome. Thank you for your time. Matthew K. Quote Link to comment Share on other sites More sharing options...
cgsheen Posted November 10, 2011 Share Posted November 10, 2011 Why wonder? It's easy to disconnect fuel tubing to the carbs - get a longer piece of tubing if you need to - run it into a can, gas can, bottle, whatever - crank the engine and verify the mechanical fuel pump is actually delivering fuel to the carbs... (you can trace this from one point to another if need be - all the way from the fuel tank pickup to the nipples on the carbs (and every point in between)) If it pumps fuel, see why the fuel isn't getting through the carbs to the engine. Quote Link to comment Share on other sites More sharing options...
Leon Posted November 10, 2011 Share Posted November 10, 2011 Check all fuel filters. Quote Link to comment Share on other sites More sharing options...
MkS30 Posted November 10, 2011 Author Share Posted November 10, 2011 Thanks for the suggestions. I'm going to go check everything now. I'll post what i discover Quote Link to comment Share on other sites More sharing options...
jasper Posted November 10, 2011 Share Posted November 10, 2011 I would focus on the electric fuel pump, and it's INTERNAL FILTER. Quote Link to comment Share on other sites More sharing options...
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