kakapoopie Posted July 27, 2009 Share Posted July 27, 2009 Ok so I've replaced the fuel tank, fuel hoses, fuel filter and pump in my 71 240z. I put about a gallon of mid grade gas in it and try to start. It'll fire away for a second or two on starter fluid, but the clear fuel filter doesn't seem to be getting any fuel. I tested the pump outside of the car and it squirted fuel across the garage floor. It is pointed in the right direction. The filter is on the right direction. The hard lines are unobstructed (blew compressed air through them). Pulled the choke out halfway. I'm thinking only one gallon might not be enough for the tank to pick up? Any ideas? Quote Link to comment Share on other sites More sharing options...
naviathan Posted July 27, 2009 Share Posted July 27, 2009 I'd definitely try more than 1 gallon. From a dry tank that probably barely hits the pickup tube. The other thing to look at is venting. If the tank isn't vented it'll build a vacuum and the pump won't be able to pull fuel. Quote Link to comment Share on other sites More sharing options...
skib Posted July 27, 2009 Share Posted July 27, 2009 Im going to assume your still running the SU's since its a 71. If your lines are clear and its not getting to the filter my first guess would be the mechanical pump (also going to have to assume you still have it since you didn't specify) pull the filter cap off and fill it with fuel, put it back on, hook up the lines and see if the mechanical pump will suck it out. You said you tested the pump but by saying its pointed in the right direction Im assuming its an electric to push fuel up to the mechanical (my 73 had one from the factory) since a mechanical only goes on one way. Do you have fuel in your float bowls? If not, I would pull the tops off and pour some in there to sort of "prime" it. Few more gallons in the tank woulnt hurt either. Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 27, 2009 Author Share Posted July 27, 2009 Thanks guys, I'll try that out. Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 27, 2009 Author Share Posted July 27, 2009 It's a mechanical fuel pump. I put in 2 and a half more gallons and still dont see any fuel in the clear filter. I put some fuel into the float bowls and it ran off of that fuel (for a few seconds) How many cranks does it usually take to get from a dry tank to the filter? Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 27, 2009 Author Share Posted July 27, 2009 Update: fuel is getting to the filter. The hardline between the pump and carbs is unobstructed. fuel hoses right up to the carb are wet with fuel from the tank. I don't know what to check from here. Thanks for the help so far. Quote Link to comment Share on other sites More sharing options...
ArizonaZ Posted July 27, 2009 Share Posted July 27, 2009 Could it be that the floats are stuck closed, and not letting fuel get into the bowls? Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 27, 2009 Author Share Posted July 27, 2009 I'm still new to carburetors, not sure whats what. I do know that the cylinder inside the carburetor is slow to pull up (when I'm opening it to spray in starter fluid) How do I check the floats? Quote Link to comment Share on other sites More sharing options...
skib Posted July 28, 2009 Share Posted July 28, 2009 the floats are in the float bowls. I suggest doing a little research on SU's Quote Link to comment Share on other sites More sharing options...
motoman Posted July 28, 2009 Share Posted July 28, 2009 I'm in the same area as you right now. What you might want to do is remove the lines from the fuel rail and put gad in them. Then try to start it. Mine ran for a little and then stopped because i can get fuel from the pump to the fuel rail. Good luck. Quote Link to comment Share on other sites More sharing options...
ArizonaZ Posted July 28, 2009 Share Posted July 28, 2009 Here are a couple of websites that helped me out when I was learning about SU's Here and Here Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 28, 2009 Author Share Posted July 28, 2009 Thanks for the links Arizona. I'm gonna try pouring fuel into the float bowls now and NOT the oil hole like i was doing Quote Link to comment Share on other sites More sharing options...
skib Posted July 28, 2009 Share Posted July 28, 2009 Thanks for the links Arizona. I'm gonna try pouring fuel into the float bowls now and NOT the oil hole like i was doing make sure you pull the tops and clean that fuel out and put in new oil Quote Link to comment Share on other sites More sharing options...
kakapoopie Posted July 28, 2009 Author Share Posted July 28, 2009 ^^Will do. I took off the float bowl covers and found them bone dry. After comparing the two float adjustments, they were way off of each other, I adjusted the one that wasn't fully actuating the valve to match the other. Both were dry though . Sprayed carb cleaner into the float valve, let it sit. Tried to blow from the input line through the valve but no air is getting through, whether the valve is in or out. This valve was also stuck open at first, but it eventually pushed down with a screwdriver. So at least I've narrowed down the problem, but I don't know why the valve's wouldn't let fuel through. They both move up and down now. Gah I wish I had a laptop to reference in the garage!! Quote Link to comment Share on other sites More sharing options...
skib Posted July 28, 2009 Share Posted July 28, 2009 http://www.ztherapy.com/ pick up the "just SU's" video Quote Link to comment Share on other sites More sharing options...
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