Guest 280-Monzie Posted April 18, 2003 Share Posted April 18, 2003 I have been visiting this site for about 3 years, but just now registrered. It has been a great help in planning the future for my -75 280, the search function has been a great help especially. Unfortunatly I could not find what I was looking for this time. I am in quite a crunch for this weekend and I do not think I could get there without the help of others. I need to have the car functional by Monday, as it will be used in emisions research, (honestly it will be). The problem is that it has been standing still for about 3 to 4 years, and many systems are in need of replacement, the car was fully functional prior. I have drained the fueltank and got about 5.5 gallons of bad smelling gas out, looked much like dark tea. I have the fuelfilter, high pressure fuelhose, hoseclamps and injector gaskets. My problem is that I do not have an open line to the fueltank, not from the feedside nor the returnline. As I had plenty of fuel in the tank and not much crud (about a spoonfull) I was hoping (okay go ahead and laugh) that I would not have a clooged line. Is there a checkvalve that could get stuck? Or will the fuelpump be a complete blockage unless it is running? I have not tested the function of the pump yet as I did not have a battery untill yesterday. Quote Link to comment Share on other sites More sharing options...
z-ya Posted April 18, 2003 Share Posted April 18, 2003 Can you hear the pump running? Is there a filter before the pump? Where are you checking fuel flow, at the fuel rail, or at the pump? Try pulling the inlet hose off the pump, and see if you can siphon any gas from it. From what you are saying, it sounds like the pump might be gummed up. Quote Link to comment Share on other sites More sharing options...
Guest 280-Monzie Posted April 18, 2003 Share Posted April 18, 2003 Can you hear the pump running? I have not checked since I cranked the car about one year ago. My fear is that if the pump is jammed, I would burn it up. Besides, I only started to buy parts two days ago and got the battery yesterday. Is there a filter before the pump? I do not remember seeing any external fuelfilter exept for the one in the enginebay, located left of the engine. I am quite certain there is a filter in the tank though. Where are you checking fuel flow, at the fuel rail, or at the pump? I have not checked for flow with pump running. Though I know that both lines are blocked from the filter and back (from the firewall back). Try pulling the inlet hose off the pump, and see if you can siphon any gas from it. From what you are saying, it sounds like the pump might be gummed up. The inlet hose would be the returnline? If so, it is rock solid I could not get any fuel or air from either line. Could the pump be gummed up even though there was plenty of fuel in the tank? If the pump is gummed up, should I be able to get it loose by forcing injector cleaner down the fuel line on the pressure side, with an air compressor? Quote Link to comment Share on other sites More sharing options...
z-ya Posted April 18, 2003 Share Posted April 18, 2003 In the tank there might be a strainer, but not a filter. My 240Z tank had neither, just an open ended tube. First thing I would do is make sure the pump is running. You may have to have someone crank it while you listen near the pump, although I think it runs for a second or two when you first turn the ignition on. If the pump doesn't run, check you electrical connections first. Make sure you have power at the pump. If the pump appears to run, then I would dissconnect the line that goes from the tank to the pump (inlet hose to pump), and try to bow compressed air into the tank. This may disslodge anythin that might be clogging the inlet from the inside of the tank. Hope this helps. Pete Quote Link to comment Share on other sites More sharing options...
Guest 280-Monzie Posted April 18, 2003 Share Posted April 18, 2003 I'll give the pump a quick test, If I disconnect the startersolenoid, I should hear the pump myself. I do think I will have to disconnect the hoses everywhere, try with the compressed air and see what comes shooting out. Hopefully I can get this done during the evening and next morning, I think I may have to redo the brakes on Sunday. Thanks for the advice and happy Easter Quote Link to comment Share on other sites More sharing options...
Georgia Flash Posted April 18, 2003 Share Posted April 18, 2003 I am smack dab in the middle of putting my fuel tank back on my 75 as we speak! I found the return line, which goes to the fuel tank, to be clogged with rust and debris. The main line however is pretty clean. My Z has sat for a long time since I have owned it and it sat for about 5 years before that. I looked at the old stock pump yesterday and pulled off the cover that the inlet pipe goes to. It has a small plastic thing on the inside that was clogged almost shut! Check this out if you plan on using the pump again. I will be using the Carter pump that I purchased from Jegs. I should have pictures to show you guys later tonight when I come in from working on it. I will not be using the return line anymore so I was wondering how can I block off the line that goes into the tank? Anyone know? Quote Link to comment Share on other sites More sharing options...
z-ya Posted April 18, 2003 Share Posted April 18, 2003 Why won't you be using the return line? If you are using a regulator, you really should use the return line. The return will keep the fuel at the injector cooler. When idling in traffic, most of the fuel will return back to the tank. A return line will also extend the life of your fuel pump. Pete Quote Link to comment Share on other sites More sharing options...
Georgia Flash Posted April 18, 2003 Share Posted April 18, 2003 I will not be using fuel injection. I will be using a carbed Chevy 350 So therefore there is no need for the return line. Quote Link to comment Share on other sites More sharing options...
280Zen Posted April 23, 2003 Share Posted April 23, 2003 I just got my 83 280zx running good after it had been sitting for a year or more. Their is a strainer in the fuel tank on the sending unit. You will need to pull it out, clean the sending unit. If the gas was that bad then the sending unit will be totally clogged! The fuel rail will also most likely be clogged to some extent. I had to pull the fuel rail this past weekend and clean it out then replace my injectors. Their is also a fuel damper near the fuel pump that may also need replacing. Quote Link to comment Share on other sites More sharing options...
Guest 280-Monzie Posted April 23, 2003 Share Posted April 23, 2003 Unfortunatly, the strainer on my tank was not removable, I ended up replacing the tank. They used a whole bunch of different tanks My old pickup line was certainly clogged, it was like 10 year old asphalt. I replaced the sending unit as well, it had a nice coting of sludge. I cleaned out the fuelrail, changed injector gaskets and fuel injector hoses yesterday, not much crud in them though. Allthough the car missfired, it did work on all six I replaced the ignition wires too. Only brakes left ...... I just got my 83 280zx running good after it had been sitting for a year or more. Their is a strainer in the fuel tank on the sending unit. You will need to pull it out, clean the sending unit. If the gas was that bad then the sending unit will be totally clogged! The fuel rail will also most likely be clogged to some extent. I had to pull the fuel rail this past weekend and clean it out then replace my injectors. Their is also a fuel damper near the fuel pump that may also need replacing. Quote Link to comment Share on other sites More sharing options...
280Zen Posted April 23, 2003 Share Posted April 23, 2003 I have a good sending unit with the strainer if you need one. Quote Link to comment Share on other sites More sharing options...
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