brianZortiz Posted February 19, 2011 Share Posted February 19, 2011 I bought an early 74 260z with flat top Su Carbs,I had a 73 240z but sold it because of its condition. The 73 had dual webbers, that ran well and i learned to tune and adjust them. The 260z that i have now has been stored since 1996 in a garage. It is all stock with flat top carbs and the P.O told me in order to start car I need to put drops of fuel into carbs. I went ahead to change into a 5 speed transmission from an 83 280zx and a CLSD 3.70, this motivated me to find some earlier type round top SU's. I never turned the car on with the flat top carbs. The round top Su conversion was fairly simple, I kept my n36 intake and switched balance tubes from the early carbs. I blocked unnecessary lines and hooked up fuel lines and booster vacuum line. I finished everything within a couple of days, now it was time to start the car. I tried to start the car with staring fluid and it ran for 2 seconds. I did this for 10 times till i gave up. I went ahead and did research. I checked my mechanical fuel pump and the lines from electrical fuel pump to mechanical pump were dry. I hooked the line back up and removed the valve cover and pumped the mechanical pump using my hands. I did this for a total of 10 minutes and no fuel coming out of line. I then tried another method of adding fuel to bowls and hoping the mechanical pump will start to pump. The car ran for a total of 5 minutes till it died. I checked the line from tank to mechanical pump and it was still dry. I filled the bowls again and it ran for another 5 minutes, I tried to rev car but it dies down. I then go back to mechanical pump and its still dry. I changed the fuel filter just 2 days ago before start attempt, and fuel is getting to filter. I am assuming the fuel lines are clogged or the mechanical pump or electrical pump are not working. I not sure what to do now and why is the car bogging out? Quote Link to comment Share on other sites More sharing options...
SHO-Z Posted February 19, 2011 Share Posted February 19, 2011 If your tank is low on gas your fuel lines are switched. I had mine switched and it would run out of gas with about 2 gallons in the tank. My electric pump at the tank was also trash. I installed a electric pump with a switch to get everything full of fuel. Of course my z will sit for months between being started. Quote Link to comment Share on other sites More sharing options...
brianZortiz Posted February 19, 2011 Author Share Posted February 19, 2011 (edited) I did put around 2 gallons of fuel in the tank to try to start her up. How do I check if my fuel lines are switched? Thanks for reply! Edited February 19, 2011 by brianZortiz Quote Link to comment Share on other sites More sharing options...
brianZortiz Posted February 23, 2011 Author Share Posted February 23, 2011 I got it. It was a bad mechanical fuel pump. The bogging was fixed by enriching the carbs. I bypassed electrical pump. It works great now. Quote Link to comment Share on other sites More sharing options...
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