Ga_Z Posted August 23, 2006 Share Posted August 23, 2006 I have been searching patiently for several weeks now but I have not found an answer doing searches. So I finally decided to post. I have a '76 280Z, owned it since '83 and it has set for almost 2 years now. I finally starting getting some time to work on it but now I'm stuck. When trying to get it started I noticed my fuel pump did not come on. Purchased a used one and tested it before installing it. It worked fine. After putting it on I still get no fuel. I found the thread(s) on the fuel pump relays, they all have been checked and are good. I tried diconnecting the oil pressure unit, didn't work. I tried the trick with the AFM, didn't work either. I have also checked the connection ar the hatch, seems OK. Anyone have any ideas? I am at a dead end.Thanks Quote Link to comment Share on other sites More sharing options...
Dayz Posted August 23, 2006 Share Posted August 23, 2006 - Do you have sparks - Do you have fuel - Is you timming OK If you have those 3 your car should run !!! Is your pump working? You seem like you have tested out of the car, does it work in the car? Maybe some connections are bad...usually that is the problem Dayz Quote Link to comment Share on other sites More sharing options...
Ga_Z Posted August 24, 2006 Author Share Posted August 24, 2006 The spark is good. Have plenty of fresh fuel in the tank. have not checked the timing yet but I'm not getting any fuel through the lines and the pump doesn't come on like it should so I think the timing would not matter at this point (?). I did test the pump out of the car. I have thought about running a wire from the battery to check it but that would not really tell me anything. I may try to check the wiring this weekend, see where I am getting a current to. Agravating! Quote Link to comment Share on other sites More sharing options...
2126 Posted August 24, 2006 Share Posted August 24, 2006 Yep, sounds like its time for the old multimeter! Also, check your fuses and grounds. Tom Quote Link to comment Share on other sites More sharing options...
seth Posted August 24, 2006 Share Posted August 24, 2006 I noticed my fuel pump did not come on. Did it come on now the the pump is replaced. I had a similar suspect, and put in a fuel pressure gauge in the engine bay to "prove" that I have pressure right to the rail. Quote Link to comment Share on other sites More sharing options...
getZ Posted August 24, 2006 Share Posted August 24, 2006 If you still have doubts about the pump or the relay, you can always make them work by simply running a wire from the battery directly to each component and by pass the ignition and the computer. When I had an MSD fuel pump it was easy to tell when it was on because it was so loud. The old Holley one are just as noisy but the stock Nissan ones aren't so easy to tell they're on from inside the car. Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted August 24, 2006 Share Posted August 24, 2006 I have a brand new MSD pump and if I let it sit for a few days or more, I have to jump the pump, then it works fine. Just hook the positive terminal to a wire and touch it to the battery and let it prime for a few seconds. Then take it off and start the car. Quote Link to comment Share on other sites More sharing options...
Ga_Z Posted August 26, 2006 Author Share Posted August 26, 2006 thanks for the suggestions guys. I have a friend who is an electrician coming over Sunday. Maybe we can track it down.In the meantime if anyone has any more suggestions I'm all ears. Quote Link to comment Share on other sites More sharing options...
veritech-z Posted August 26, 2006 Share Posted August 26, 2006 My vote is to run some wire. Divide and conquer! Test each piece one at a time, starting at the pump, working your way back up to the switch. Quote Link to comment Share on other sites More sharing options...
Z-man Posted August 26, 2006 Share Posted August 26, 2006 Hey GA_Z, Good luck with your problem...these things kind of work them out with trying components one at time. Can you tell if your getting gas to the plugs? I'd pull one plug out and smell if it's getting fuel. And also trying some ether (but be careful!!!). Btw, where at in GA are you located? Z-man Quote Link to comment Share on other sites More sharing options...
Ga_Z Posted August 27, 2006 Author Share Posted August 27, 2006 Not getting any to the plugs. I'm in Crandall, Ga. East of Dalton, about 35 miles south of Chattanooga. Quote Link to comment Share on other sites More sharing options...
Ga_Z Posted August 28, 2006 Author Share Posted August 28, 2006 Update, got the pump to going (finally) but I'mm still not getting any fuel to the engine. I'm going to try to blow the lines out, maybe they're plugged. If thats not it I'm thinking that the pump may not be able tp pick up fuel from the tank. Does anyone know how the pick up system from the tank works? Is it a rubber or metal line, etc. Any type of filter on it? Any info appreciated. Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted August 28, 2006 Share Posted August 28, 2006 If you blow the lines out, make sure that you disconnect the rubber hose in the engine compart ment that goes to the fuel filter-or you could blow all that gunk right into your injectors. Just because the pump makes noise doesn't mean its working-make sure its pumping gas out of the pump. It will still make noise if its running in reverse. Quote Link to comment Share on other sites More sharing options...
Guest lockedowne Posted August 29, 2006 Share Posted August 29, 2006 Have you replaced your fuel filter? A clogged filter will stop fuel as well. Quote Link to comment Share on other sites More sharing options...
Twizted Posted August 30, 2006 Share Posted August 30, 2006 I'm going thru the same issue with mine. It had also sat for 2 years. My injectors were also sticking along with the fuel pump and had a clogged fuel filter. I occasionally have to jump start the fuel pump with a booster box to get it to "wake up" for a testing session then it'll work fine the rest of the day. Fuel filter was really restrictive so that was changed. The injectors were also not working so I jump started them as well. I just used my booster box with a paper clip (I know it's not the safest) and supplied power till they were all clicking and working again. It now runs but very low pressure. I'm checking the tank and possibly the regulator. Quote Link to comment Share on other sites More sharing options...
OlderThanMe Posted August 30, 2006 Share Posted August 30, 2006 hey GA_Z, I had a similar problem in my 74 260z with carbs. The car sat for 5 years with half a tank of gas. I even got the gas tank stripped and re sealed. It did not help any... I took a bicycle shift cable and pulled the center cable out of it and flared the end to make a little wire brush. I cramed it down the output tube on the gas tank until I knocked off the little screen on the end of the tube. I now run 2 fuel filters to catch any gunk that comes through. I had removed the fuel pump and reworked it but it was not coming on. I just ran a new wire with a switch on it so I could manually control it. Once the tank was clear and the pump was working I got excellent fuel pressure. It is a carb system but your EFI could ave a similar problem. Quote Link to comment Share on other sites More sharing options...
Ga_Z Posted August 31, 2006 Author Share Posted August 31, 2006 hey GA_Z' date=' I had a similar problem in my 74 260z with carbs. The car sat for 5 years with half a tank of gas. I even got the gas tank stripped and re sealed. It did not help any...I took a bicycle shift cable and pulled the center cable out of it and flared the end to make a little wire brush. I cramed it down the output tube on the gas tank until I knocked off the little screen on the end of the tube. I now run 2 fuel filters to catch any gunk that comes through. I had removed the fuel pump and reworked it but it was not coming on. I just ran a new wire with a switch on it so I could manually control it. Once the tank was clear and the pump was working I got excellent fuel pressure. It is a carb system but your EFI could ave a similar problem.[/quote'] I'm glad you posted this. I thought of the same thing (about the tank), that is why I asked. I thought I might hook a hose to the pump to go into a gas can to make sure it is pumping out. If it was then I could blow out the line. And if it didn't then, well I wasn't sure. So is the pick line metal with a screen? Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted August 31, 2006 Share Posted August 31, 2006 I don't know if the 76s had an oil pressure switch. If so check that. It's on the passenger side of the block and is supposed to prevent the pump from running if there is no oil pressure (it's an "angel" switch). Mario Quote Link to comment Share on other sites More sharing options...
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