nzarano Posted August 6, 2018 Share Posted August 6, 2018 Had a couple situations where I thought the car ran out of gas or something sputtered and died and then either needed gas or just needed to pull the valve cover and pump the fuel pump by hand until gas comes up and then it usually starts right up.... happened about 4 times, one i think was because the car was out of gas and then put gas in and needed to be pumped after that... other 3 car had gas.... is this a fuel pump issue or the dreaded vapor lock? located in nj, these have all happened within the past 2 months any guidance would be appreciated! Quote Link to comment Share on other sites More sharing options...
nzarano Posted August 6, 2018 Author Share Posted August 6, 2018 car did it again today.... drained the tank car had ~8 gallons in it when it did this, drove about 10 miles and then parked for about 20 mins then it wouldnt start... pulled the pump, pressed it by hand quite a few times and then was back on the road Quote Link to comment Share on other sites More sharing options...
bunkhouse Posted August 7, 2018 Share Posted August 7, 2018 I'd try opening the hood a bit when you stop and try to let some heat out of the engine bay. It sounds like vapor lock or fuel percolation. I'm assuming this is an early Z with carbs and a mechanical pump. Quote Link to comment Share on other sites More sharing options...
nzarano Posted August 8, 2018 Author Share Posted August 8, 2018 Its a 73 240z, has an l28 that is carb'd, i believe they are 3 screw carbs. I replaced the fuel pump, filter, and the lines in the engine bay yesterday... now i have a misfire yay Quote Link to comment Share on other sites More sharing options...
bunkhouse Posted August 8, 2018 Share Posted August 8, 2018 What rpm does the mis-fire occur? Quote Link to comment Share on other sites More sharing options...
nzarano Posted August 8, 2018 Author Share Posted August 8, 2018 was mostly highway driving, could feel a little around 1.8k and 3,5k Quote Link to comment Share on other sites More sharing options...
bunkhouse Posted August 8, 2018 Share Posted August 8, 2018 Did it get worse while accelerating or climbing a hill? Quote Link to comment Share on other sites More sharing options...
nzarano Posted August 8, 2018 Author Share Posted August 8, 2018 yep Quote Link to comment Share on other sites More sharing options...
bunkhouse Posted August 8, 2018 Share Posted August 8, 2018 Assuming the plugs are good, you didn't change anything electrical, bump an elec. connection somewhere, (voe), and it's not leaking fuel, I'd suspect a lack of fuel. A fuel pressure and volume test could eliminate the pump as a cause. Checking and or changing filters, starting with the last chance banjo fittings on top of the float bowls all the way back to the tank is always a good idea. If you think it may be just a mixture problem, while it's struggling to go up a hill, gradually add some choke and see if it improves. Quote Link to comment Share on other sites More sharing options...
nzarano Posted August 9, 2018 Author Share Posted August 9, 2018 checked and cleaned plugs, one cam lobe had some scarring so it got a tiny adjustment... hoping that isnt it but starting to think it might be... nothing electrical was touched, its intermittent Quote Link to comment Share on other sites More sharing options...
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