Guest HellTriX Posted May 11, 2003 Share Posted May 11, 2003 Sorry long post: I did some working on my new 1976 280z today. Backed up on ramps, slid under her rear, and found the bracket where I assume a stock fuel pump used to reside? No longer there but two tubes run from gas tank to hard lines running to motor. One hard line plumbed into electronic fuel pump which is only pumping 2.8-3 PSI low volume (not even a half a cup of fuel in a minute with no load)... This feeds one of the hard two hard lines that run above the intake. Which is feeding both Carbs. The other hard line rail feeds back to the tank I think so that would mean no fuel pressure? Guess the carbs have to vacuum there own fuel in. But I turned the ignition on and let the fuel pump go for a bit and noticed fuel was leaking/draining out of the bottom of the front carb and out of the thing beside it where the fuel line hooks up to beside the carb. I am not sure what that is yet, but there is no hose on the top of it and fuel was coming out of that too. The other carb didn't leak. If any of you can give me some more info or point me to the right direction. I am tempted to build an adapter to hook up my 4 bbl edelbrock to the two flanges for the original carbs I am building a 1966 Impala currently http://ecahost.com/Impala and I found this 280Z for too good of a price to pass up. MY first thought when I saw this car was "boy that would be awesome with a v8 and TH400 that is sitting in my shop.†I just wanted to get this thing running ok while I sand blast the body and interior floor boards. So I don’t think I really want to rebuild the carbs since I plan to drop a v8 in it very very soon. I thought about building an intake that I could mount my Edelbrock 600cfm carb too that would adapt to the mounting flanges that the webers bolt to. It would be crude but I think it would provide decent metering of air/fuel if I jet the carb right. If it ran good enough to make 10 block trips to the parts store that’s all that I really care about till the V8 is ready. Thanks for the input. BTW, what’s SU stand for? Hehe Quote Link to comment Share on other sites More sharing options...
Synlubes Posted May 12, 2003 Share Posted May 12, 2003 The fuel pressure you stated is ok for carbs. The flow seems to be a little low. (maybe try another pump and retest) As far as the leak, there should be brass or alumium washers between the fitting(where the fuel line slides onto) and the carb housing. Ck to see if they are there. Also ck to see if the fuel is leaking out the bottom of the accellerator pump(on side of carb). As far as the other hard line, maybe return line back to tank.(which is a good thing) Hope this helps. And Welcome to this site ! Quote Link to comment Share on other sites More sharing options...
Guest HellTriX Posted May 12, 2003 Share Posted May 12, 2003 Woohoo thanks for post, I found the leak though. It was coming out of the intake to the carb. Guess my float was stuck open and pushing excess fuel all the way though. After I adjusted that there was no more dripping fuel. That linkage doesn't look like its gonna hold pressure much longer :0 Quote Link to comment Share on other sites More sharing options...
Guest HellTriX Posted May 13, 2003 Share Posted May 13, 2003 Adjusted 2 sticking floats and now this z is running on all 6 and is strong Thanks for all your collective info. Quote Link to comment Share on other sites More sharing options...
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