motoman Posted July 23, 2009 Share Posted July 23, 2009 So last post i made a bad title. I need to figure out what is going on here. I'm building a 260z and a put a new mc fuel pump in and it is only making 2psi. I cleaned all the fuel lines and retune line out. i think there might be something wrong with the cam contating the pump. Can anyone help me out on this. I still new to this stuff so i have never ran into this problem. Quote Link to comment Share on other sites More sharing options...
rags Posted July 23, 2009 Share Posted July 23, 2009 Picture of the pump mounted on any spacer and picture of the cam fp eccentric on the front of the cam would be helpful. Even though you only have 2 lbs of pressure the engine should run as long as there is fuel in the carb bowls. Is there fuel at the carbs? Quote Link to comment Share on other sites More sharing options...
motoman Posted July 23, 2009 Author Share Posted July 23, 2009 Sorry i dont have any pics right now. But i think i need to clean the fuel tank out. So i'm going to try that and see what happens. Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted July 23, 2009 Administrators Share Posted July 23, 2009 As Rags mentioned, if you provide pics of those items, that would help a lot. You'll have to remove the valve cover to see the fuel pump eccentric. Also be sure the spacer is between the pump and the head itself. Keep us posted... Quote Link to comment Share on other sites More sharing options...
motoman Posted July 23, 2009 Author Share Posted July 23, 2009 Yah i think i might have solved my problem. The car has been sitting for 16 years so all the rubber lines are shot i'm going to replace them and clean the tank. The spacer is there i will take the cam cover off if cleaning the tank and new rubber lines doesn't fix my problem. I also took the line off the fuel pump and tested how much psi i it is making and i made 3 1/2psi. Quote Link to comment Share on other sites More sharing options...
motoman Posted July 24, 2009 Author Share Posted July 24, 2009 So i got the fuel pump out today and the lines were really bad. Heres a pic. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 27, 2009 Share Posted July 27, 2009 Now I KNOW I need those half-glasses Grandpas wear! I can see the wall (floor) fine, but those hoses are nothing but a blur... WOAH! Quote Link to comment Share on other sites More sharing options...
motoman Posted July 27, 2009 Author Share Posted July 27, 2009 Sorry my camera is really bad. ON the other hand i'm still having problems. I put fuel in all the lines the pump is now make 31/2 psi and pumping some fuel but it isn't getting to the fuel rail?!?! Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 28, 2009 Share Posted July 28, 2009 Where are you measuring fuel pressure, before or after the fuel filter? With a T or deadheaded? What happens when you pump from a clean bucket of fuel? Quote Link to comment Share on other sites More sharing options...
motoman Posted July 28, 2009 Author Share Posted July 28, 2009 After the pump. It is a vacum/psi. So if i had it before it it would take a vacum reading.The filter is brand new so i don't think that would be the problem. Yes i have tryed it clean fuel the fuel in the gas tank if new as well. The gas tank has been clean out very well and the rubber lines have been replace. There is fuel in the pump but there is no fuel in the carb floats or the furl rail. Quote Link to comment Share on other sites More sharing options...
MikeyZee Posted July 30, 2009 Share Posted July 30, 2009 We had this problem on my son's 72 240z. We had cleaned the tank but not flushed the lines or changed the filter. It was crud from the tank clogging the filter. When you said you cleaned the tank did you have it boiled out or what? There could be sediment still left in there. Just a thought. Good luck! Quote Link to comment Share on other sites More sharing options...
motoman Posted July 31, 2009 Author Share Posted July 31, 2009 So the problem is my carbs. The fuel is coming out in the line right before it goes into the carbs. So i will have to clean out the carbs. I'll let you guys know it that gets my car going. Quote Link to comment Share on other sites More sharing options...
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